Author Topic: What can be done to improve the performance of clandestine nitroethane synth?  (Read 60473 times)

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Osmium

  • Guest
Rearrangement of ethyl nitrite.

Aurelius

  • Guest
BTW, Rhodium, you can place all those synths as a nitroethane FAQ- it's not quite complete, but with a little help, aurelius can complete it.  mostly, aurelius just lacks access to a few of the articles.  that and everything that's available on the hive and your site for nitroethane is on this so far.  (if aurelius missed something, please tell aurelius so it can be included)


joyman

  • Guest

Method 11:  3-chloropropionic acid sodium salt, and NaNO2

ClCH2CH2COONa + NaNO2 „³ NO2CH2CH2COONa + NaCl

NO2CH2CH2COONa + H2O ¡Vheat„³  NO2CH2CH3 + NaHCO3

Modification of Nitromethane synthesis from Organic Synthesis, Vol? Pg 401.




WizardX mentioned this a couple of times but didn't give the full reference - heres the ref.

From Organic Syntheses, Collective Vol. I, pp 401-403,

To 500 g of chloroacetic acid in 500 g cracked ice add enough 40% NaOH solution to make the resulting mixture slightly alkaline. Do not let the temperature rise above 20 degrees C. This solution is mixed with 365 g sodium nitrite dissolved in 500 ml water in a 3 liter round-bottom flask. This flask should then be equipped with a thermometer dipping into the liquid and a distillation condenser. The mixture is carefully heated until the first bubbles or carbon dioxide appear (at about 80 C). The heat is then withdrawn and the heat of the reaction keeps it warm. If the reaction becomes too vigorous, it should be cooled. After the reaction ceases, heat cautiously until 110 C is reached. Nitromethane will distill over during this heating and the previous spontaneous heating. Separation of the nitromethane / water mixture and redistillation will give approx. 35 % yield after drying and redistillation.


Aurelius

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Joyman, your the greatest.  thanks


Marcus

Antoncho

  • Guest
Ethyl nitrite rearrangement doesn't work (at least, for any practical purpose).
If you carefully read the original article you'll see why - the rate of convertion is way too slow .

Antoncho

Aurelius

  • Guest
ok, aurelius is just collecting what's been posted through the years.  would somebody please state whether the ethyl nitrite route is rearrangement, isomerization or whatever.  the article (at least) is correct.  aurelius would like somebody (Antoncho-who has obviously seen the article) to post the article so that the rest can observe and aurelius can perhaps remove that method or include its experimental portions.


Aurelius

  • Guest

some stuff from a while back on the hive

rev drone
It makes sense. Thermodynamically, this is quite favorable. But the only references I can find to the isomerization of lower alkyl nitrites into lower nitoalkanes involve considerable heat and pressure -- not to mention the occasional asbestos catalyst.
So does anybody have any good ideas about any magical transition metal catalysts that could facilitate isomerization at more ambient conditions? It looks so good, so obtainable, yet somehow its so out-of reach.

------------------
-the good reverend drone

Ipsa scientia potestas est


Chem Guy
Not Fe, that's for sure. 
Intutively, I would say Lewis acid catalyzed rearrangement, but that is only a whim.  I don't know for sure. 


Acme
My magic 8-ball came up blank on this one.
I asked it (reactant)GH-CH2-CH2-O-N-O --->> (product)GH-CH2-CH2-NO2 and big fat goose egg was the reply, sadly

Osmium
Share the refs you already have Drone.
I've never heard something like that


rev drone
J.Chem.Soc.; 109; 1916; 701;
------------------
-the good reverend drone

Ipsa scientia potestas est

Aurelius

  • Guest
Here's the updated list:

Nitroethane synthesis: a compilation

Method 1: from sodium ethyl sulfate and a metal nitrite

1.5 mole sodium nitrite (103.5g) is intimately mixed with 1 mole of sodium ethyl sulfate (158g) and 0.0625 moles of K2CO3 (8.6g). The mixture is then heated to 125-130°C, at which temperature the nitroethane distills over as soon as it is formed. The heating is discontinued when the distillation flow slackens considerably, and the crude nitroethane is washed with an equal amount of water, dried over CaCl2, and if needed, decolorized with a little activated carbon. The nitroethane is then re-distilled, collecting the fraction between 114-116°C. Yield 46% of theory

(another ref says max. 42%)
Chemical Abstracts, Vol 49, pg 836.

Method 2: from diethyl sulfate and sodium nitrite

Initial run - Into a stoppered bottle was placed a mixture of diethyl sulfate (120g) and sodium nitrite solution (120g in 160ml of water.) The bottle was shaken mechanically for 20 hours, the pressure being released at intervals. The contents were then poured into a separating funnel, and the upper layer separated, dried over calcium chloride. and distilled at 14 mmHg, the distillate up to 60°C being collected (the residue, ca. 230g., consisted of ethyl sulphate and was used again). The distillate was fractionated at atmospheric pressure, and the fraction of bp 114-116°C collected. This was shaken with water, dried over calcium chloride, run through charcoal, and redistilled; bp 114-115.5°C. Yield, 17.7g. (31%, or allowing for recovered ethyl sulfate, 43.5%).

    Routine run - A second experiment was then carried out using the same quantity of ethyl sulfate as above. The recovered nitrite solution (lower layer) from the first run was concentrated by adding approximately 16 g. of sodium nitrite per 160ml of solution. Yield 26.4g (46%, or allowing for recovered ethyl sulphate, 65%). For each additional subsequent run approximately 16 g. of nitrite per 160 ml of solution were added, although this represents a rather diminishing concentration in view of the increased yield of nitroethane


Method 3: from ethyl bromide (iodide) and sodium nitrite (dmf)
32.5 grams of ethyl bromide (0.3 moles) was poured into a stirred solution of 600ml dimethylformamide and 36 grams dry NaNO2 (0.52 mole) in a beaker standing in a water bath keeping the solution at room temperature as the reaction is slightly exothermic. Always keep the solution out of direct sunlight. The stirring was continued for six hours. After that, the reaction mixture was poured into a 2500 ml beaker or flask, containing 1500 ml ice-water and 100 ml of petroleum ether. The petroleum ether layer was poured off and saved, and the aqueous phase was extracted four more times with 100 ml of petroleum ether each, where after the organic extracts were pooled, and in turn was washed with 4x75ml of water. The remaining organic phase was dried over magnesium sulfate, filtered, and the petroleum ether was removed by distillation under reduced pressure on a water bath, which temperature was allowed to slowly rise to about 65°C. The residue, consisting of crude nitroethane was distilled under ordinary pressure (preferably with a small distillation column) to give 60% of product, boiling at 114-116°C.
 
 The ethyl bromide reacts with NaNO2, forming nitroethane and ethyl nitrite.
This method can be varied in a few ways. Firstly, dimethyl sulfoxide (DMSO) can be substituted for the dimethylformamide (DMF) as solvent. Ethylene glycol also works as solvent, but the reaction proceeds pretty sluggishly in this medium, allowing for side reactions, such as this: RH-NO2 + R-ONO => R-(NO)NO2 + R-OH. KNO2 can also be used instead of NaNO2. If NaNO2 is used in DMF, 30g (0.5 mol) of urea can also be added as nitrite scavenger to minimize side reactions, as well as simultaneously increasing the solubility of the NaNO2 and thereby significantly speeding up the reaction.

           If the ethyl bromide is substituted with ethyl iodide, the required reaction time is decreased to only 2.5 h instead of 6 h. In case ethyl iodide is employed, a slight change in the above procedure needs to be done. The pooled pet ether extracts should be washed with 2x75ml 10% sodium thiosulfate, followed by 2x75ml water, instead of 4x75ml water as above. This to remove small amounts of free iodine

Method 4 : from ethyl halide and silver nitrite

Cool 100 g of silver nitrite (0.65 mol) in 150 ml of dry ether to 0°C in a 3 neck 500 ml flask (in a darkened room or using yellow light). Add 0.5 moles of ethyl halide (78g ethyl iodide or 55g of ethyl bromide) dropwise over a 2 hour period while stirring constantly and maintaining the temperature at 0°C and dark conditions. Stir for 24 hours at 0°C, then 24 hours at room temp if using ethyl bromide, and 48h if using ethyl bromide. (Test for halogens to see when the reaction is completed, through adding a few drops of the reaction mixture to a test tube containing an alcoholic solution of silver nitrate and note if a precipitate appears. If so, the reaction is not complete. The Beilstein test can also be used, it uses a small coil of copper wire in a test tube to which a small portion of the reaction mixture is added and it is noted if reaction occurs, where elemental silver will deposit on the surface of the copper coil.) Silver iodide (or bromide) will precipitate in the solution during the course of the reaction. Filter off the silver salt, and wash it with several portions of ether. Evaporate the ether at room temperature. (This may be substituted with distillation of the ether using a water bath at atmospheric pressure. A 2x45 cm column packed with 4 mm pyrex helices is used. A more efficient column is not used due to the instability of the ethyl nitrite formed as a by-product in the reaction. Maintain anhydrous conditions since the ethyl nitrite will hydrolyze to ethanol and will be difficult to separate.) Then vacuum distill the residue at about 5 mmHg. The ethyl nitrite will be the initial fraction, followed by an intermediate fraction, then the nitroethane will distill. The yield is about 83% of theory


Method 5: oxidation of ethyl amine with peracids  (m-perbenzoicacid)

General Procedure for the Oxidation of Primary & Secondary amines using m-chloroperbenzoic acid.

m-Chloroperbenzoic acid (4.1g, 0.02mol, 85% pure) is dissloved in 30 mls of 1,2-dichloroethane in a three-neck flask equipped with a condenser and a pressure-equalising dropping funnel. The amine (0.005 mol) in 3-5 mls of 1,2-dichloroethane solvent is added drop-wize to the refluxing m-Chloroperbenzoic acid/1,2-dichloroethane solution. Refluxing temperature 83oC for 3 hours.
After the addition of the amine and refluxing time, the reaction mixture is cooled, filtered and washed with three 50 ml portions of 1M sodium hydroxide solution and dried over anhydrous magnesium sulphate. The removal of the 1,2-dichloroethane solvent by distillation (rotary) gives a crude nitroalkane. Purification of the crude crude nitroalkane with vacuum distillation. Yields vary, approx 62 %.

Oxidation of n-propylamine and higher alkane amines give nitroalkane at approx 62 %.

[Note] Nitromethane and nitroethane form sodium water-soluable salts with 1M sodium hydroxide solution

Refs: W.D. Emmons, Am.Soc. 79, 5528 (1957)

Method 6: oxidation of ethyl amine with potassium permanganate
Perhaps by the method in Org Synth CV 5, 845. 

   REFS for methods 5 + 6:


Chem.Ber. (1902) 35, 4294
Eur.J.Med.Chem. (1991) 26, 2, 167-178
Eur.J.Org.Chem. (1998) 4, 679-682
Heterocycles (1998) 48, 1, 181-185
J.Amer.Chem.Soc. (1954) 76, 4494
J.Amer.Chem.Soc. (1956) 78, 4003
J.Amer.Chem.Soc. (1957) 79, 5528
J.Chem.Soc.Chem.Commun. (1995) 15, 1523-1524
J.Org.Chem. (1960) 25, 2114-2126
J.Org.Chem. (1979) 44, 659-661.
J.Org.Chem. (1992) 57, 25, 6759-6764
J.Org.Chem. (1993) 58, 5, 1118-1121
Magn.Reson.Chem. (1997) 35, 2, 131-140
Org.Synth. (1963) 43, 87
Tetrahedron (1991) 47, 28, 5173-5184
Tetrahedron (1995) 51, 41, 11305-11318
Tetrahedron Lett. (1981) 22, 18, 1655-1656
Tetrahedron Lett. (1986) 27, 21, 2335-2336
Tetrahedron Lett. (1996) 37, 6, 805-808
Z.Naturforsch.B (1989) 44, 11, 1475-1478

Method 7:  destructive distillation of alpha-bromopropionic acid with sodium nitrite

   K2CO3 + NaNO2 + H2O + a-br-propionic acid ? nitroethane 50%yield

   Add 20g of the acid to a solution of K2CO3 in the amount of base that causes the solution to be basic to phenolphthalein.  The add 20g of NaNO2—there should be approx. 100ml of solution.  Place in a 250ml rb flask and distill quickly- the first 100ml will come over before the rxn takes place.  Then the nitroethane comes over. Distill until no more product comes over.  (don’t distill to dryness) 

V. Auger. Bull. Soc. Chim. France  Post no. 3, 23, 333 (1900) by the kolbe method.

Method 8:  oxidation of ethyl amine to nitroethane with dimethyldioxirane

    A new synthesis of nitro compounds using dimethyldioxirane(DMDO)
Tetrahedron Letters,Vol.27,No.21,pp 2335-2336,1986

Abstract: Dimethyldioxirane oxidizes primary amines to nitro compounds in a facile, mild, high yield process.

Here we report that aliphatic and aromatic primary amines are rapidly and efficiently oxidized to nitro compounds by dimethyldioxirane, DMDO. Indeed a survey of some general methods for the preparation of nitro compounds (2) suggests to us that the use of DMDO may be the method of choice. The conditions used are exceedingly mild and give the nitro compound as a solution in acetone. Table 1 summarizes our results with some representative amines.

Table 1. Oxidation of amines with Dimethyldioxirane(DMDO).
Amine            Product           Yield    (Product m.p.(C)
~~~~~~~~~~~~~~~~~~~~~~~--~~~~~~--~---~~~~~~~~~~~--
Aniline           Nitrobenzene        91
p-Anisidine       p-Nitroanisole      94            54
n-Butylamine      1-Nitrobutane       84
sec-Butylamine    2-Nitrobutane       81
tert-Butylamine   2-Methyl-2-nitrobut 90
1-Aminoadamantane 1-Nitroadamsntane   95            159
Cyclohexylamine   Nitrocyclohexane    95
trans-Azobenzene  Axoxybenzene        96            36

In a typical reaction n-butylamine (0.052g; 0.7 mmol) in 5 ml of acetone was treated with 95 ml of DMDO, in acetone solution (ca 0.05M)(4) The solution was kept at room temperature for 30 min. with the exclusion of light. Analysis of the reaction mixture by capillary GC indicated the presence of l-nitrobutane only. The oxidations are believed to occur by means of successive oxidations by,1. In the aniline case the blue color of the nitroso conpound is observed immediately upon adding the solution of DMDO. In separate experiments we have shown that both phenylhydroxylamine and nitrosobenzene are readily oxidized to nitrobenzene by DMDO. The blue color of intermediate nitroso compound was observed in all of the amine oxidations.

Dimethyldioxirane is a powerful oxygen atom donor, which oxidizes a variety of substrates 'including hydrocarbons'. Work is continuing on the oxidation of nitrogen-containing compounds by DMDO.

1. Chemistry of Dioxiranes. 5. Paper 4 of this series is J. Am. Chem. Soc., in press (1986).
2. H.O. Larson in The Chemistry of the Nitro and Nitroso Groups, H. Feuer, Ed., J. Wiley and Sons. N.Y. 1969.
4. The concentration of,DMDO in acetone was determined by titrating an aliquot with phenyl methyl sulfide. The synthesis of DMDO has been described (5).
5. R.W. Murray and R. Jeyaraman, J. Org. Chem., (50) 2847 (1985).
Dioxiranes:  synthesis and reactions of methyldioxiranes.
J. Org. Chem.  (1985),  50(16),  2847-53.

Abstract
The peroxymonosulfate-acetone system produces dimethyldioxirane under conditions permitting distn. of the dioxirane from the synthesis vessel.  The same conditions were used to prep. other methyldioxiranes.  Solns. of dimethyldioxirane prepd. in this manner were used to study its chem. and spectroscopic properties.  The caroate-acetone system was also used to study the chem. of in situ generated dimethyldioxirane.  cis- And trans-stilbenes were converted stereospecifically to the corresponding epoxides with dimethyldioxirane in acetone

Other refs: Oxidation of primary amines by dimethyldioxirane:
Murray, R.W.,S.N. Rajadhyaksha, L. Mohan, J. Org. Chem., 1989, 54, 5783


Method 9:  isomerization of ethyl nitrite to nitroethane over asbestos catalyst

   J. Chem. Soc. 109, 701 (1916)
   (pass over asbestos in a tube furnace @ 120-130*C for best results/best yield)

Method 10: ethyl bromide, DMSO, NaNO2 and phloroglucinol dihydrate

   By Ritter, in Strike’s book- TSII.

   32g or 26ml EtBr is poured into 250ml of DMSO with 36g NaNO2 and 52g phloroglucinol already present in solution.  (Pglucinol is expensive but can be recycled) put on good mag. stirring and stopper the flask.  Stir for two hours in emulsion form, then dump into a 600ml of ice water and extract twice with DCM. (2x200ml)   dry the extracts with  MgSO4 or CaCl2 the evap off the DCM.  Distill and collect the fraction from 113-116*C--- yields about 20g of nitroethane (80%)  (another ref say maybe over 90% consistently)

Other notes:  catechol and resorcinol have the same nitrite scavenging abilities as phloroglucinol.  And ethylene glycol can be used as a solvent.  A simple NaOH wash of the final solution (nitroethane removed) will give the sodium salt of your phloroglucinol catalyst.  Acidification of the solution will precip the catalyst for recovery by filtration.

JACS 79, 2507 (1957)
Tetrahedron vol 46, No 21, pp 7443-57 (1990)
Ber. 11, 1332 (1878)
Ber. 12, 417 (1879)
JACS, Vol 78, 1497-1501

Method 11:  3-chloropropionic acid sodium salt, and NaNO2

   ClCH2CH2COONa + NaNO2 ? NO2CH2CH2COONa + NaCl

   NO2CH2CH2COONa + H2O –heat?  NO2CH2CH3 + NaHCO3

From Organic Syntheses, Collective Vol. I, pp 401-403

To 500 g of chloroacetic acid in 500 g cracked ice add enough 40% NaOH solution to make the resulting mixture slightly alkaline. Do not let the temperature rise above 20 degrees C. This solution is mixed with 365 g sodium nitrite dissolved in 500 ml water in a 3 liter round-bottom flask. This flask should then be equipped with a thermometer dipping into the liquid and a distillation condenser. The mixture is carefully heated until the first bubbles or carbon dioxide appear (at about 80 C). The heat is then withdrawn and the heat of the reaction keeps it warm. If the reaction becomes too vigorous, it should be cooled. After the reaction ceases, heat cautiously until 110 C is reached. Nitromethane will distill over during this heating and the previous spontaneous heating. Separation of the nitromethane / water mixture and redistillation will give approx. 35 % yield after drying and redistillation


Method 12:  most complicated synth

   CH3CH=NOH  + Cl2 ? CH3CH (Cl)(NO)   (? gem-chloronitrosoethane)

   Gem-comp + O3 ? CH3CH (Cl)(NO2)

   CH3CH (Cl)(NO2) + NaOH + H2 + Pd/C ? nitroethane (50%) + HCl

JOCS, Vol 41, pg 733-735 (1976)

Method 13:  electrochemical oxidation ---- not possible by method below

   Ethyl amine is oxidized to methyl nitrile in anhydrous solvent.  In the presence of water it is oxidized to the imine, then acetaldehyde which is further oxidized to acetic acid.

Method 14:  Vapor Phase nitration of propane.

   The propane is bubbled through nitric acid heated to 108*C and lead into a reactor at 420*C.  the product is then condensed and fractionated.  (26% nitroethane formed)

Industrial and Engineering Chemistry, Vol 28, Mar, 1936. Pg 339-344.
JOC, Vol 17, pg 906-944.

Method 15:  Vapor Phase nitration of ethane.

Same as propane but at least 80% yields. 

Industrial and Engineering Chemistry, Vol 28, Mar, 1936. Pg 339-344.
JOC, Vol 17, pg 906-944.

Method 16:  Vapor Phase Nitration of Ethanol using Group II oxides or halides as a catalyst (works for methanol and propanol too)

US pat # 4431842

Method 17: Distillation of alpha-bromopropionic acids with NaNO2 in the presence of Magnesium Sulfate in DMSO

US pat # 4319059

(the alpha-bromo acid can be obtained using propionic acid in the procedure from Org. Synth. CV 1, 115.)

This patent shows an easy route from alpha-bromopropionic acid to nitroethane in excellent yield. The patent also say that Magnesium chloride, bromide or sulfate may be used instead of the magnesium methoxide, but it doesn't say if this affects yields.

The reaction proceeds as follows: In the polar aprotic solvent DMSO, the alpha-bromopropionic acid reacts in an SN2 fashion with nitrite ion to give alpha-nitropropionic acid and bromide ion. The role of the Mg2+ ion in the reaction is to facilitate the decarboxylation (removal of CO2) from the intermediate nitro acid, as it forms a chelate between one of the oxygen atoms on the nitro group and the oxygen anion of the carboxylic acid. The electron-withdrawing nature of the nitro group makes the carboxylic acid group labile, and it can easily be given off as carbon dioxide. If magnesium methoxide is used in place of the other magnesium salts, the carboxylic acid is directly deprotonated, probably making the reaction go even faster.

There is no workup mentioned in the patent, but I'd suggest flooding with water (or using large amounts of dilute (5%) HCl in the hydrolysis step), and then extract the nitroethane with dichloromethane, ether or possibly petroleum ether. Then the combined organic layers are washed first with water and then with a concentrated NaCl solution, followed by drying the organic phase over anhydrous MgSO4, which is then filtered off. Then the solvent is removed distilled, and the residual crude nitroethane is fractionally distilled at 114-115°C.

alpha-Bromopropionic acid can be made from propionic acid and phosphorous tribromide (from red phosphorous and bromine, the Hell-Volhard-Zelinsky reaction,

http://www.geocities.com/chempen_software/reactions/RXN099.htm

or

http://www.orgsyn.org/orgsyn/default.asp?formgroup=base_form_group&dbname=orgsyn

), or by HBr bromination of lactic acid (alpha-hydroxypropionic acid).

Example 1

To a mixture of magnesium methoxide (0.11 mole) and dimethyl sulfoxide (50 ml) a-bromopropionic acid (0.11 mole) was added at 20°C. with stirring. To this mixture a solution of sodium nitrite (0.145 mole) in dimethyl sulfoxide (65 ml) was added at room temperature. Then, the reaction mixture was stirred at room temperature for 6 hours and was neutralized upon addition of diluted hydrochloric acid. Analysis of the reaction mixture indicated more than 99% conversion of alpha-bromopropionic acid and 94.5% yield of nitroethane.

Example 2

In the manner of Example 1, sodium nitrite, alpha-bromopropionic acid and magnesium methoxide were reacted in dimethyl sulfoxide as the aprotic solvent. The reaction time was 2 hours for one run and 22 hours for another. Reaction was conducted at room temperature. The run at 2 hours converted only 94.5% of the acid and yielded 72.7% nitroethane. The second run at 22 hours gave a conversion of > 99% and a yield of 100%.

At room temperature the reaction apparently takes about 4-5 hours to go to completion. At higher temperatures of 40°C. up to about 75°C. the reaction time is shorter. Thus, one or two hours or even less time at 75°C. will completely convert the bromoacid to the intermediate which can then be decomposed to the nitroalkane.

When using dimethyl sulfoxide as solvent temperatures approaching 100°C should be avoided since the solvent will volatilize and decompose at about 100°C. Other aprotic solvents may not have this disadvantage


Method 18:  Oxidation of alanine with permanganate followed by decarboxylation

Nitroethane via oxidation of alanine? 
 
 Theory
------
MeCH(NH2).COOH + 3(O) --> MeCH(NO2).COOH + H2O.
MeCH(NO2).COOH + NaOH --> MeCH(NO2).COONa.
MeCH(NO2).COONa + H2O --> MeCH2(NO2) + NaHCO3.
Procedure
---------
A solution of potassium permanganate (0.3 mol) in water was made by dissolving 47.41 g KMnO4 in 400 mL hot water in a 1 L 3-necked flask fitted with a reflux condenser, a stirbar[note 1], thermometer, and a 100-mL addition funnel. As the solution cools to room temperature fine crystals of KMnO4 crystallise out of solution[note 2]. A solution of alanine (0.1 mol, 8.91 g) in 65 mL of water was placed in the addition funnel and added dropwise with stirring over a 20 minute period. The temperature slowly rose. When the addition was complete, the reaction mixture was heated to 60º over a period of approximately 2 hours. 40 mL of acetone was added [note 3] and then the reaction mixture maintained at 70-85º [the sludge was extremely viscous and the stirbar was of no use] for 2 hours. 0.1 mol sodium hydroxide in 20 mL of water was then added through the addition funnel.
Pause (to be completed).
-----
The flask showed no sign of heating up after addition of the NaOH. By now the black/brown sludge will not mix (with the stir-bar). The next step is to heat to 80-100C to decarboxylate any nitro-propionic acid and then to steam distil.
Notes:
------
1. An overhead stirrer is essential - the stirbar will get clogged with MnO2.
2. KMnO4 solubility is 1 in 3.5 parts of hot water and 1 in 14 parts of cold water.
3. The acetone was added to try to clear the sludge. I would have added more but I had second thoughts.
Refs:
1. Synthesis Of Aliphatic And Alicyclic Nitro Compounds; Org. Syn. p 131-132 [The Oxidation of Amines]
2. Organic Syntheses, Vol. 52, pp 77-82, 2-Metryl-2-Nitrosopropane and its Dimer, A. Calder, A. R. Forrester and S. P. Hepburn.
3. Vogel's Practical Organic Chemistry, 4th ed. P 564 'Nitromethane'.
Questions.
----------
1. Is it safe to heat this mixture to 90C without a stirrer? [the next step to make sure that nitro-propionic acid is decarboxylated]
2. Should I improvise an overhead stirrer to finish this off?
3. Nitroethane will steam distil won't it?
4. Should the permanganate have been buffered?
5. I think the NaOH should have been in there from the start. The sodium salt of alanine would have been a better idea?
6a. Would the reaction benefit from taking place in an organic solvent?
6b. If so, what solvents are suitable apart from acetone?
I will repeat this - with an overhead stirrer and the addition of sodium salt of alanine rather than alanine followed by NaOH.

Method 19:  Reduction of acetaldehyde oxime and oxidation of the product

Good work ! An alternative method to alanine amino oxidation and decarboxylation is the reaction : CH3CHO + NH2OH ==>> CH3CH=NOH,
Then carfully reduced to CH3CH2NHOH, and then oxidized as proposed by you above to get CH3CH2NO

nitroethane from acetaldoxime
J.H. Boyer / H. Alul, Am.Soc. 81, 4237 (1959)

Method 20: Oxidation of ethyl amine with CrO3

Somewhere in Vogel’s (the oxidation)

Method 21:  Nitroethane from propyl nitrate

J.B. Levy / F.J. Adrian, Am.Soc. 77, 2015 (1954)

Method 22:   Nitroethane from nitroethene (and nitroethanol)

Nitromethane and formaldehyde will produce nitroethene in vapor phase, over silica-supported lead catalysts at 200o.  You can always use Baker's yeast. Nitroalkene in Pet. Ether with bakers yeast for a couple days will reduce it to the nitroalkane.

CH3NO2 + HCOH == NaOH ==>> HOCH2CH2NO2 Aldol Condensation.

HOCH2CH2NO2 == heat ==>> H2C=CH-NO2 + H2O

nitromethane and formaldehyde are reacted in alkaline solution, they give nitroethanol; this can bee dehydrated to nitroethene by concentrated acid, or again in vapor phase, passing over phosphoric acid or boric anhydride. Suppose one wanted to use such means to convert nitromethane, which is easy to get, to nitroethane, which is not. A selective reduction of the double bond, in the presence of the nitro group, would do the trick

As an alternative: in general, aldehydes and ketones will also react in the presence of alumina and KF ( at r.t.) to form beta-nitroalcohols, which typically dehydrate to nitroalkenes in very acidic conditions. See Tetrahedron Letters, Vol 27, 1986, p493. This article doesn't specifically use nitroethene as an example, but the other compounds tested (which are larger) gave yields of nitroalcohol around 70%. The conversion to the nitroalkene *should* be stoichiometric. I expect this method may also yield nitrostyrenes with a similar degree of success




Antoncho

  • Guest
i think Megamole has an interesting article on peracetic acid oxid'n of alkylamines...

Anyone wishes to ask him for it? ;D  ;D

Antoncho

Aurelius

  • Guest
newest method
« Reply #29 on: September 11, 2002, 10:09:00 PM »
here's what available on the hive, thus far:

Nitroethane synthesis: a compilation

Method 1: from sodium ethyl sulfate and a metal nitrite

1.5 mole sodium nitrite (103.5g) is intimately mixed with 1 mole of sodium ethyl sulfate (158g) and 0.0625 moles of K2CO3 (8.6g). The mixture is then heated to 125-130°C, at which temperature the nitroethane distills over as soon as it is formed. The heating is discontinued when the distillation flow slackens considerably, and the crude nitroethane is washed with an equal amount of water, dried over CaCl2, and if needed, decolorized with a little activated carbon. The nitroethane is then re-distilled, collecting the fraction between 114-116°C. Yield 46% of theory

(another ref says max. 42%)
Chemical Abstracts, Vol 49, pg 836.

Method 2: from diethyl sulfate and sodium nitrite

Initial run - Into a stoppered bottle was placed a mixture of diethyl sulfate (120g) and sodium nitrite solution (120g in 160ml of water.) The bottle was shaken mechanically for 20 hours, the pressure being released at intervals. The contents were then poured into a separating funnel, and the upper layer separated, dried over calcium chloride. and distilled at 14 mmHg, the distillate up to 60°C being collected (the residue, ca. 230g., consisted of ethyl sulphate and was used again). The distillate was fractionated at atmospheric pressure, and the fraction of bp 114-116°C collected. This was shaken with water, dried over calcium chloride, run through charcoal, and redistilled; bp 114-115.5°C. Yield, 17.7g. (31%, or allowing for recovered ethyl sulfate, 43.5%).

Routine run - A second experiment was then carried out using the same quantity of ethyl sulfate as above. The recovered nitrite solution (lower layer) from the first run was concentrated by adding approximately 16 g. of sodium nitrite per 160ml of solution. Yield 26.4g (46%, or allowing for recovered ethyl sulphate, 65%). For each additional subsequent run approximately 16 g. of nitrite per 160 ml of solution were added, although this represents a rather diminishing concentration in view of the increased yield of nitroethane


Method 3: from ethyl bromide (iodide) and sodium nitrite (dmf)
32.5 grams of ethyl bromide (0.3 moles) was poured into a stirred solution of 600ml dimethylformamide and 36 grams dry NaNO2 (0.52 mole) in a beaker standing in a water bath keeping the solution at room temperature as the reaction is slightly exothermic. Always keep the solution out of direct sunlight. The stirring was continued for six hours. After that, the reaction mixture was poured into a 2500 ml beaker or flask, containing 1500 ml ice-water and 100 ml of petroleum ether. The petroleum ether layer was poured off and saved, and the aqueous phase was extracted four more times with 100 ml of petroleum ether each, where after the organic extracts were pooled, and in turn was washed with 4x75ml of water. The remaining organic phase was dried over magnesium sulfate, filtered, and the petroleum ether was removed by distillation under reduced pressure on a water bath, which temperature was allowed to slowly rise to about 65°C. The residue, consisting of crude nitroethane was distilled under ordinary pressure (preferably with a small distillation column) to give 60% of product, boiling at 114-116°C.

The ethyl bromide reacts with NaNO2, forming nitroethane and ethyl nitrite.
This method can be varied in a few ways. Firstly, dimethyl sulfoxide (DMSO) can be substituted for the dimethylformamide (DMF) as solvent. Ethylene glycol also works as solvent, but the reaction proceeds pretty sluggishly in this medium, allowing for side reactions, such as this: RH-NO2 + R-ONO => R-(NO)NO2 + R-OH. KNO2 can also be used instead of NaNO2. If NaNO2 is used in DMF, 30g (0.5 mol) of urea can also be added as nitrite scavenger to minimize side reactions, as well as simultaneously increasing the solubility of the NaNO2 and thereby significantly speeding up the reaction.

           If the ethyl bromide is substituted with ethyl iodide, the required reaction time is decreased to only 2.5 h instead of 6 h. In case ethyl iodide is employed, a slight change in the above procedure needs to be done. The pooled pet ether extracts should be washed with 2x75ml 10% sodium thiosulfate, followed by 2x75ml water, instead of 4x75ml water as above. This to remove small amounts of free iodine

Method 4 : from ethyl halide and silver nitrite

Cool 100 g of silver nitrite (0.65 mol) in 150 ml of dry ether to 0°C in a 3 neck 500 ml flask (in a darkened room or using yellow light). Add 0.5 moles of ethyl halide (78g ethyl iodide or 55g of ethyl bromide) dropwise over a 2 hour period while stirring constantly and maintaining the temperature at 0°C and dark conditions. Stir for 24 hours at 0°C, then 24 hours at room temp if using ethyl bromide, and 48h if using ethyl bromide. (Test for halogens to see when the reaction is completed, through adding a few drops of the reaction mixture to a test tube containing an alcoholic solution of silver nitrate and note if a precipitate appears. If so, the reaction is not complete. The Beilstein test can also be used, it uses a small coil of copper wire in a test tube to which a small portion of the reaction mixture is added and it is noted if reaction occurs, where elemental silver will deposit on the surface of the copper coil.) Silver iodide (or bromide) will precipitate in the solution during the course of the reaction. Filter off the silver salt, and wash it with several portions of ether. Evaporate the ether at room temperature. (This may be substituted with distillation of the ether using a water bath at atmospheric pressure. A 2x45 cm column packed with 4 mm pyrex helices is used. A more efficient column is not used due to the instability of the ethyl nitrite formed as a by-product in the reaction. Maintain anhydrous conditions since the ethyl nitrite will hydrolyze to ethanol and will be difficult to separate.) Then vacuum distill the residue at about 5 mmHg. The ethyl nitrite will be the initial fraction, followed by an intermediate fraction, then the nitroethane will distill. The yield is about 83% of theory


Method 5: oxidation of ethyl amine with peracids  (m-perbenzoicacid)

General Procedure for the Oxidation of Primary & Secondary amines using m-chloroperbenzoic acid.

m-Chloroperbenzoic acid (4.1g, 0.02mol, 85% pure) is dissloved in 30 mls of 1,2-dichloroethane in a three-neck flask equipped with a condenser and a pressure-equalising dropping funnel. The amine (0.005 mol) in 3-5 mls of 1,2-dichloroethane solvent is added drop-wize to the refluxing m-Chloroperbenzoic acid/1,2-dichloroethane solution. Refluxing temperature 83oC for 3 hours.
After the addition of the amine and refluxing time, the reaction mixture is cooled, filtered and washed with three 50 ml portions of 1M sodium hydroxide solution and dried over anhydrous magnesium sulphate. The removal of the 1,2-dichloroethane solvent by distillation (rotary) gives a crude nitroalkane. Purification of the crude crude nitroalkane with vacuum distillation. Yields vary, approx 62 %.

Oxidation of n-propylamine and higher alkane amines give nitroalkane at approx 62 %.

[Note] Nitromethane and nitroethane form sodium water-soluable salts with 1M sodium hydroxide solution

Method 6: oxidation of ethyl amine with potassium permanganate
Perhaps by the method in Org Synth CV 5, 845. 

REFS for methods 5 + 6:


Chem.Ber. (1902) 35, 4294
Eur.J.Med.Chem. (1991) 26, 2, 167-178
Eur.J.Org.Chem. (1998) 4, 679-682
Heterocycles (1998) 48, 1, 181-185
J.Amer.Chem.Soc. (1954) 76, 4494
J.Amer.Chem.Soc. (1956) 78, 4003
J.Amer.Chem.Soc. (1957) 79, 5528
J.Chem.Soc.Chem.Commun. (1995) 15, 1523-1524
J.Org.Chem. (1960) 25, 2114-2126
J.Org.Chem. (1979) 44, 659-661.
J.Org.Chem. (1992) 57, 25, 6759-6764
J.Org.Chem. (1993) 58, 5, 1118-1121
Magn.Reson.Chem. (1997) 35, 2, 131-140
Org.Synth. (1963) 43, 87
Tetrahedron (1991) 47, 28, 5173-5184
Tetrahedron (1995) 51, 41, 11305-11318
Tetrahedron Lett. (1981) 22, 18, 1655-1656
Tetrahedron Lett. (1986) 27, 21, 2335-2336
Tetrahedron Lett. (1996) 37, 6, 805-808
Z.Naturforsch.B (1989) 44, 11, 1475-1478

Method 7:  destructive distillation of alpha-bromopropionic acid with sodium nitrite

K2CO3 + NaNO2 + H2O + a-br-propionic acid ? nitroethane 50%yield

Add 20g of the acid to a solution of K2CO3 in the amount of base that causes the solution to be basic to phenolphthalein.  The add 20g of NaNO2—there should be approx. 100ml of solution.  Place in a 250ml rb flask and distill quickly- the first 100ml will come over before the rxn takes place.  Then the nitroethane comes over. Distill until no more product comes over.  (don’t distill to dryness) 

V. Auger. Bull. Soc. Chim. France  Post no. 3, 23, 333 (1900) by the kolbe method.

Method 8:  oxidation of ethyl amine to nitroethane with dimethyldioxirane

A new synthesis of nitro compounds using dimethyldioxirane(DMDO)
Tetrahedron Letters,Vol.27,No.21,pp 2335-2336,1986

Abstract: Dimethyldioxirane oxidizes primary amines to nitro compounds in a facile, mild, high yield process.

Here we report that aliphatic and aromatic primary amines are rapidly and efficiently oxidized to nitro compounds by dimethyldioxirane, DMDO. Indeed a survey of some general methods for the preparation of nitro compounds (2) suggests to us that the use of DMDO may be the method of choice. The conditions used are exceedingly mild and give the nitro compound as a solution in acetone. Table 1 summarizes our results with some representative amines.

Table 1. Oxidation of amines with Dimethyldioxirane(DMDO).
Amine            Product           Yield    (Product m.p.(C)
~~~~~~~~~~~~~~~~~~~~~~~--~~~~~~--~---~~~~~~~~~~~--
Aniline           Nitrobenzene        91
p-Anisidine       p-Nitroanisole      94            54
n-Butylamine      1-Nitrobutane       84
sec-Butylamine    2-Nitrobutane       81
tert-Butylamine   2-Methyl-2-nitrobut 90
1-Aminoadamantane 1-Nitroadamsntane   95            159
Cyclohexylamine   Nitrocyclohexane    95
trans-Azobenzene  Axoxybenzene        96            36

In a typical reaction n-butylamine (0.052g; 0.7 mmol) in 5 ml of acetone was treated with 95 ml of DMDO, in acetone solution (ca 0.05M)(4) The solution was kept at room temperature for 30 min. with the exclusion of light. Analysis of the reaction mixture by capillary GC indicated the presence of l-nitrobutane only. The oxidations are believed to occur by means of successive oxidations by,1. In the aniline case the blue color of the nitroso conpound is observed immediately upon adding the solution of DMDO. In separate experiments we have shown that both phenylhydroxylamine and nitrosobenzene are readily oxidized to nitrobenzene by DMDO. The blue color of intermediate nitroso compound was observed in all of the amine oxidations.

Dimethyldioxirane is a powerful oxygen atom donor, which oxidizes a variety of substrates 'including hydrocarbons'. Work is continuing on the oxidation of nitrogen-containing compounds by DMDO.

1. Chemistry of Dioxiranes. 5. Paper 4 of this series is J. Am. Chem. Soc., in press (1986).
2. H.O. Larson in The Chemistry of the Nitro and Nitroso Groups, H. Feuer, Ed., J. Wiley and Sons. N.Y. 1969.
4. The concentration of,DMDO in acetone was determined by titrating an aliquot with phenyl methyl sulfide. The synthesis of DMDO has been described (5).
5. R.W. Murray and R. Jeyaraman, J. Org. Chem., (50) 2847 (1985).
Dioxiranes:  synthesis and reactions of methyldioxiranes.
J. Org. Chem.  (1985),  50(16),  2847-53.

Abstract
The peroxymonosulfate-acetone system produces dimethyldioxirane under conditions permitting distn. of the dioxirane from the synthesis vessel.  The same conditions were used to prep. other methyldioxiranes.  Solns. of dimethyldioxirane prepd. in this manner were used to study its chem. and spectroscopic properties.  The caroate-acetone system was also used to study the chem. of in situ generated dimethyldioxirane.  cis- And trans-stilbenes were converted stereospecifically to the corresponding epoxides with dimethyldioxirane in acetone

Method 9:  isomerization of ethyl nitrite to nitroethane over asbestos catalyst

J. Chem. Soc. 109, 701 (1916)
(pass over asbestos in a tube furnace @ 120-130*C for best results/best yield)

Method 10: ethyl bromide, DMSO, NaNO2 and phloroglucinol dihydrate

By Ritter, in Strike’s book- TSII.

32g or 26ml EtBr is poured into 250ml of DMSO with 36g NaNO2 and 52g phloroglucinol already present in solution.  (Pglucinol is expensive but can be recycled) put on good mag. stirring and stopper the flask.  Stir for two hours in emulsion form, then dump into a 600ml of ice water and extract twice with DCM. (2x200ml)   dry the extracts with  MgSO4 or CaCl2 the evap off the DCM.  Distill and collect the fraction from 113-116*C--- yields about 20g of nitroethane (80%)  (another ref say maybe over 90% consistently)

Other notes:  catechol and resorcinol have the same nitrite scavenging abilities as phloroglucinol.  And ethylene glycol can be used as a solvent.  A simple NaOH wash of the final solution (nitroethane removed) will give the sodium salt of your phloroglucinol catalyst.  Acidification of the solution will precip the catalyst for recovery by filtration.

JACS 79, 2507 (1957)
Tetrahedron vol 46, No 21, pp 7443-57 (1990)
Ber. 11, 1332 (1878)
Ber. 12, 417 (1879)
JACS, Vol 78, 1497-1501

Method 11:  3-chloropropionic acid sodium salt, and NaNO2

ClCH2CH2COONa + NaNO2 ? NO2CH2CH2COONa + NaCl

NO2CH2CH2COONa + H2O –heat?  NO2CH2CH3 + NaHCO3

Modification of Nitromethane synthesis from Organic Synthesis, Vol? Pg 401.

Method 12:  most complicated synth

CH3CH=NOH  + Cl2 ? CH3CH (Cl)(NO)   (? gem-chloronitrosoethane)

Gem-comp + O3 ? CH3CH (Cl)(NO2)

CH3CH (Cl)(NO2) + NaOH + H2 + Pd/C ? nitroethane (50%) + HCl

JOCS, Vol 41, pg 733-735 (1976)

Method 13:  electrochemical oxidation ---- not possible by method below

Ethyl amine is oxidized to methyl nitrile in anhydrous solvent.  In the presence of water it is oxidized to the imine, then acetaldehyde which is further oxidized to acetic acid.

Method 14:  Vapor Phase nitration of propane.

The propane is bubbled through nitric acid heated to 108*C and lead into a reactor at 420*C.  the product is then condensed and fractionated.  (26% nitroethane formed)

Industrial and Engineering Chemistry, Vol 28, Mar, 1936. Pg 339-344.
JOC, Vol 17, pg 906-944.

Method 15:  Vapor Phase nitration of ethane.

Same as propane but at least 80% yields. 

Industrial and Engineering Chemistry, Vol 28, Mar, 1936. Pg 339-344.
JOC, Vol 17, pg 906-944.

Method 16:  Vapor Phase Nitration of Ethanol using Group II oxides or halides as a catalyst (works for methanol and propanol too)

US pat # 4431842

Method 17: Distillation of alpha-bromopropionic acids with NaNO2 in the presence of Magnesium Sulfate in DMSO

US pat # 4319059

(the alpha-bromo acid can be obtained using propionic acid in the procedure from Org. Synth. CV 1, 115.)


Method 18:  Oxidation of alanine with permanganate followed by decarboxylation

Nitroethane via oxidation of alanine? 

Theory
------
MeCH(NH2).COOH + 3(O) --> MeCH(NO2).COOH + H2O.
MeCH(NO2).COOH + NaOH --> MeCH(NO2).COONa.
MeCH(NO2).COONa + H2O --> MeCH2(NO2) + NaHCO3.
Procedure
---------
A solution of potassium permanganate (0.3 mol) in water was made by dissolving 47.41 g KMnO4 in 400 mL hot water in a 1 L 3-necked flask fitted with a reflux condenser, a stirbar[note 1], thermometer, and a 100-mL addition funnel. As the solution cools to room temperature fine crystals of KMnO4 crystallise out of solution[note 2]. A solution of alanine (0.1 mol, 8.91 g) in 65 mL of water was placed in the addition funnel and added dropwise with stirring over a 20 minute period. The temperature slowly rose. When the addition was complete, the reaction mixture was heated to 60º over a period of approximately 2 hours. 40 mL of acetone was added [note 3] and then the reaction mixture maintained at 70-85º [the sludge was extremely viscous and the stirbar was of no use] for 2 hours. 0.1 mol sodium hydroxide in 20 mL of water was then added through the addition funnel.
Pause (to be completed).
-----
The flask showed no sign of heating up after addition of the NaOH. By now the black/brown sludge will not mix (with the stir-bar). The next step is to heat to 80-100C to decarboxylate any nitro-propionic acid and then to steam distil.
Notes:
------
1. An overhead stirrer is essential - the stirbar will get clogged with MnO2.
2. KMnO4 solubility is 1 in 3.5 parts of hot water and 1 in 14 parts of cold water.
3. The acetone was added to try to clear the sludge. I would have added more but I had second thoughts.
Refs:
1. Synthesis Of Aliphatic And Alicyclic Nitro Compounds; Org. Syn. p 131-132 [The Oxidation of Amines]
2. Organic Syntheses, Vol. 52, pp 77-82, 2-Metryl-2-Nitrosopropane and its Dimer, A. Calder, A. R. Forrester and S. P. Hepburn.
3. Vogel's Practical Organic Chemistry, 4th ed. P 564 'Nitromethane'.
Questions.
----------
1. Is it safe to heat this mixture to 90C without a stirrer? [the next step to make sure that nitro-propionic acid is decarboxylated]
2. Should I improvise an overhead stirrer to finish this off?
3. Nitroethane will steam distil won't it?
4. Should the permanganate have been buffered?
5. I think the NaOH should have been in there from the start. The sodium salt of alanine would have been a better idea?
6a. Would the reaction benefit from taking place in an organic solvent?
6b. If so, what solvents are suitable apart from acetone?
I will repeat this - with an overhead stirrer and the addition of sodium salt of alanine rather than alanine followed by NaOH.

Method 19:  Reduction of acetaldehyde oxime and oxidation of the product

Good work ! An alternative method to alanine amino oxidation and decarboxylation is the reaction : CH3CHO + NH2OH ==>> CH3CH=NOH,
Then carfully reduced to CH3CH2NHOH, and then oxidized as proposed by you above to get CH3CH2NO

NEWEST METHOD---
Method 20: reduction of nitroethene to nitroethane using 2-phenylbenzimidazoline

https://www.thevespiary.org/rhodium/Rhodium/chemistry/phenylbenzimidazoline.html



just thought aurelius would add it to the compilation for posterity and preservation

Bwiti

  • Guest
"A post showed up a few months ago here on the ...
« Reply #30 on: September 12, 2002, 05:00:00 AM »
"A post showed up a few months ago here on the boards describing the failure of NaNO2 and ethyl bromide in a polar aprotic solvent (DMF,DMSO and n-Methylpyrolidinone) to form nitroethane."

  A complete failure? Come on, please tell me you're joking! 

Love my country, fear my government.

SpicyBrown

  • Guest
Was a nitrite scavenger present?
« Reply #31 on: September 12, 2002, 10:20:00 AM »

"A post showed up a few months ago here on the boards describing the failure of NaNO2 and ethyl bromide in a polar aprotic solvent (DMF,DMSO and n-Methylpyrolidinone) to form nitroethane."

  A complete failure? Come on, please tell me you're joking! 




SWIM wonders, was a catechol-type nitrite scavenger used? Quite some time ago, a FOAF or what-not had a failure with EtBr/NaNO2 in DMSO, but not only was the DMSO shit-grade, no nitrite scavenger was used. The FOAF indicates soon the dream will be thought about again in either n,n-DMF or redistilled DMSO with catechol present. Any idea if propylene glycol will work as a solvent?

SpicyBrown


Bwiti

  • Guest
I assumed that since it was on Rhodium's page, ...
« Reply #32 on: September 13, 2002, 03:51:00 AM »
I assumed that since it was on Rhodium's page, then it would work without phlorogluc-whatever - Can't find a source for it that I'm comfortable buying from. I just can't see how one person can fail, then another can get a 60% yield? Is someone full of shit, or did someone fail because they accidentally urinated in the rxn while they were drunk? I don't think that the use of DMSO in place of dimethylformamide would be a problem, but I'm not a chemist. Fuck it, when I get the chems, I'll try it out and post it. What else do I have to lose besides throwing money out the window. :)

Love my country, fear my government.

starlight

  • Guest
Do methods 7 or 11 really work?
« Reply #33 on: October 29, 2002, 07:12:00 PM »
Methods 7 and 11 look very similar in that the salt of a halogenated propionic acid is destructively distilled with Sodium Nitrite.

In method 7 the alpha-halogenated acid is used. In method 11 the beta-halogenated acid is used.

Does anyone know if either of these reactions actually works?

Or do both work? - i.e. does it matter if you have a 2- or 3- halogenated propionic acid?

These reactions appear to be more volumetrically efficient than some of the others from readily easily sourced chemicals, so it would be good to know if anyone has actually had any success with either of these or if they are theoretical at this point.

RedMonn_16

  • Guest
Well, I just LOVE to TEACH !!!
« Reply #34 on: November 05, 2002, 12:45:00 AM »

sponsan

  • Guest
nitroethane is readilly available OTC in the USA
« Reply #35 on: November 08, 2002, 12:25:00 AM »
This is a little bit off topic, but i found three otc sources of nitroethane online in 98%+ concentrations (one was ~8% though).  This stuff is very widely used in many industries, if you know what to search for, you will find it.

The only problem with aquisition is that it is a hazardous class 3 chemical and shipping overseas costs a bomb.  It makes it unrealistic to ship inter-continentally.  But, if you live in the USA, it seems you can just walk into all of these suppliers and buy it.

But for Oz bees, i think the only option is to perform the synth, which is pretty much OTC as well as all the precusrsors are available from a local photo-chem supplier.

TrickEMethod

  • Guest
I would be quite excited if what you were saying ...
« Reply #36 on: November 09, 2002, 11:38:00 AM »
I would be quite excited if what you were saying proved to be the case, but I expect that you are somehow mistaken.  NitroEthane is a listed and more over a high priority item on their 24x7 radar screen.  You woun't find it in some wood restoration kit or as the solvent for some hign end brand of paint.

I think you might be confusing Nitroethane with something else, like maybe nitromethane.  Check the CAS numbers on the msds, that often resolves seemingly too good to be true finds.

If your right I appologize, and I hope I'm not being too much of a doubter, but I definitely doubt it.

It also might have been either a setup or a ripoff.  Both are more likely than a OTC product locatable via a web search, containing a 98% concentration of a primary methamphetamine precursor.

And on the eight day, God created Meth...
... and hasn't done much of anything usefull since!

sponsan

  • Guest
take a look at this product info snippet...
« Reply #37 on: November 10, 2002, 10:35:00 PM »
Could someone please confim if they have managed to successfully aquire the following product (i am sure you'll recognise the format of the doc):




If so, could you please drop me a PM - i'd love to know how you went.

Many Thanks!

El_Zorro

  • Guest
So is that product available on the shelf ...
« Reply #38 on: November 11, 2002, 12:04:00 AM »
So is that product available on the shelf somewhere?  It looks good to me, but if it has to be ordered, I don't think it'd be worth the risk.  But if it can be found on the shelf somewhere near me, I might just have to nut myself.

Who is that masked man?

RedMonn_16

  • Guest
On the Shelf Somewhere.
« Reply #39 on: November 11, 2002, 08:36:00 AM »
I'm sure it's on the shelf somewhere, but I also think that iMac's have this little Cut, Paste, & Post on the Internet feature somewhere on the shelf as well.  Maybe we should ask Libby?  Alternatively, when she lies about it, we could always burn her at the stake again I guess.

"If it's not love, then it's THE BOMB, the bomb, the bomb that will bring us together."--Stephen Morrissey

"Like some liars at a witch trial, ya'll look good for your age."--Courtney Love