Author Topic: p-benzo pics... no bees want to see? =(  (Read 1705 times)

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  • Guest
Melting Point
« Reply #20 on: October 17, 2003, 01:48:00 AM »
The melting point of p-benzoquinone is 116°C, the melting point of quinhydrone is 172°C, as you would all know if you read the Vogel's article on page 745 of the file available on Rhodium's page  :)  Why play guessing games without definitive information, when you can use the time tested methods of organic chemistry  ;D


  • Guest
« Reply #21 on: October 17, 2003, 02:24:00 AM »
that doesnt look anything like swims.
So... now what does swim do? Should swim recrystalize again? Before recrystalization, swims was in powder and clumps like that picture of the good benzo. It wasnt that color however, it was much darker with yellow flakes.

If thats p-benzo then wtf is swims? Any suggestions? And if someone will answer this, can that bee explain to swim why swim yielded that crystal stuff?

Did you synth that via h2o2 and i2? Has anyone synthed via h2o2 and i2 and gotten positive results? Im absolutely fuckin baffled i mean i did exactly as the synth prescribed down to a fuckin T, even sat there and watched the temp the whole time?????? I cant imagine what could have gone wrong? After raising the temp to 50 degrees for 3 hours and letting it stir and complete the reaction, at what point is it done? What should swim look for near the end of the reaction to tell swim its time to take the heat away and start to cool the flask? I know the synth says that it should only be yellow specs floating in a dark red solvent. Swims however looked like yellow specs suspended in a thicker blackish/really dark red solution.
Now im all depressed i thought swim did somethin right  :(  :(  :(


  • Guest
Did you synth that via h2o2 and i2?
« Reply #22 on: October 17, 2003, 02:39:00 AM »
Did you synth that via h2o2 and i2?

No, that was purchased from a major chemical supply company. I have no experience making it, thankfully. The consistancy of P- Benzo is so fine that upon opening a container of it, fine clouds of it sometimes tend to fill the work space, and your nasal passage, causing burning and triggering my already allergy prone ass into a sneezing frenzy. I couldn't imagine fucking with it anymore than you already have too.

Do some research on it, look in the merk for it's uses, and use the fuckin google search engine, and also


  • Guest
Read this thread: Post 374595 I am 100% ...
« Reply #23 on: October 17, 2003, 11:07:00 AM »
Read this thread:

Post 374595

(Cyrax: "p-benzoquinone synthesis", Chemistry Discourse)

I am 100% confident that what you have is quinhydrone.

I am also 100% confident that what Midi have is benzoquinone.

The iodine/h2o2 reaction didnt work for SWIM, never went to the quinone, he was stuck at the quinhydrone stage, just like you. It doesnt matter if they are gold or green or dark, those all are quinhydrone, as it look metallic.

Try the V2O5 synthesis from the above thread, 100% easy, not a way to fail, and it give even yellower product than the one from Midi.

You cannot recrystallise quinhydrone to have benzoquinone, you must reoxidize it, that is the only solution, and dont do it with h2o2/i2, it doesn't work.


  • Guest
So is there anything i can do with my ...
« Reply #24 on: October 17, 2003, 06:36:00 PM »
So is there anything i can do with my quinhydrone?


  • Guest
Steam Distillation
« Reply #25 on: October 17, 2003, 08:51:00 PM »
From the Vogel's article you were advised to read  ;)

p-Benzoquinone (" quinone ") is obtained as the end product of the oxidation of aniline by acid dichromate solution. Industrially, the crude product is reduced with sulphur dioxide to hydroquinone, and the latter is oxidised either with dichromate mixture or in very dilute sulphuric acid solution with sodium chlorate in the presence of a little vanadium pentoxide as catalyst. For the preparation in the laboratory, it is best to oxidise the inexpensive hydroquinone with chromic acid or with sodium chlorate in the presence of vanadium pentoxide. Naphthalene may be converted into 1: 4-naphthoquinone by oxidation with chromic acid.
A fairly general procedure consists in coupling a phenol or naphthol with a diazotised amine, reducing the product to an aminophenol or aminonaphthol, and oxidising the hydroxy compound with acid ferric chloride solution. This method is illustrated by the preparation of (3 (or 1 : 2)-naphthoquinone When a solution of, say, 1 g. of hydroquinone in 4 ml. of rectified spirit is poured into a solution of 1 g. of quinone in 30 ml. of water, quinhydrone, a complex of equimolecular amounts of the two components, is formed as dark green crystals having a glistening metallic lustre, m.p. 172°. In solution, it is largely dissociated into quinone and hydroquinone. Quinhydrone is more conveniently prepared by the partial oxidation of hydroquinone with a solution of iron alum.

The article states that quinhydrone dissociates into quinone and hydroquinone in solution, so steam distillation should separate it, the hydroquinone should bee left behind  :)


  • Guest
Im finding alot of steam distillation posts...
« Reply #26 on: October 17, 2003, 11:30:00 PM »
Im finding alot of steam distillation posts about essential oils but from my understanding I set up for a regular distillation. Add distilled water and the quinhydrone/p-benzo mix together in the distilling flask. And heat til it boils. Do everything like a normal distillation, and in the receiving flask that water will cool to allow the p-benzo to crash out. Right? Ive been trying to use the fuckin search engine but havent really found anything about steam distilling quinhydrone to yield p-benzo. Also, will this be worth the effort by the look of those crystals? I mean is swim going to yield 2 grams of p-benzo?


  • Guest
Last Chance
« Reply #27 on: October 18, 2003, 02:40:00 AM »

Ive been trying to use the fuckin search engine but havent really found anything about steam distilling quinhydrone to yield p-benzo.

You're not going to find anything about this procedure, since apparently no bee has ever done this before  ;)  You've now got the chance to actually contribute something useful to this site, imagine that  ;D  There are numerous posts about steam distillation of various volatile substances here, and a very good section in the Vogel's 3rd Edition available at:

Considering the effect of quinone on tear ducts, it would be best to perform such a task with good ventilation  :)  Any more silly questions and you'll get some bad karma  8)   If you can't figure it out with what you've been told in this thread and what's available here and on Rhodium's page, you need to find a different hobby  ;D  :)  ;D


  • Guest
« Reply #28 on: October 22, 2003, 09:24:00 PM »
"As far as I know, P-Benzo is not listed, nor watched in small amounts, and I have seen it being offered recently in the US"

this is contrary to what i have come to understand. p-benzo IS
on the dea watchlist (i shouldnt need a ref for this) and some of those american companies that offer it even go so far as to state on their website: dea form required. beside the price quote for that chemical.

maybe you know a SPECIAL american chem supplier, or just have a good legit front buisness, but ive gone to looking to have it shipped into canada from china/ect...


  • Guest
Swim sees exactly as you say with the DEA form
« Reply #29 on: October 23, 2003, 01:57:00 AM »
Swim sees exactly as you say with the DEA form required next to alot of photo chem sites. But whats more important is right next to warning the suppliers are selling it in very small ammounts, like 10grams. Swim understands that p-benzo is used in very small ammounts in photography, so how would one ever be justified in buying say a lb of it, unless p-benzo has other uses. Now that swims given up on having any success with the h2o2 method as h2o2 is apparently not strong enough to oxidize the hydroquinone(?), and apparently Sodium Chlorate, which is used via the V2O5 method, is harder to acquire than fuckin quinone itself; swims been reading a little bit more about p-benzo and found out that it seems that it is used in alot of agrochemicals. It appears that it is used in some fungicides. Have any bees had success sourcing p-benzo from an agrochemical supplier?

Swims also located a supplier that sells in 100gram lots of benzo along with other chemicals. Swims excitement at finding a distributor such as this was dampened as swim scrolled through their chemicals listed and found that they also sell AMT and DMT.  ;D  It might just be swim but it seems like this distributer is aimed at clandestine chemists. It also sells 7% i2 tincture for a really high price and right next to it, peanut oil??? If any bees have had success with this distributer, and you know which one it is, PM me please.


  • Guest
alternate routes
« Reply #30 on: October 23, 2003, 01:17:00 PM »
this is contrary to what i have come to understand. p-benzo IS on the dea watchlist

Ok, first off, HOW do you know this to be factual? And how do you know that there is even a "dea watchlist" ??

If it's really hard for you bees to get this stuff then look at the next easiest route. PdCl2 - CuCl2 and O2 arent that hard to obtain and wont burn the fuck out of your orfices when working around it.  ;)


  • Guest
Swim doesnt believe in watchlists or whatever...
« Reply #31 on: October 23, 2003, 06:21:00 PM »
Swim doesnt believe in watchlists or whatever someone wants to call it. But swim has seen companys selling p-benzo requesting a "DEA Buyers Authorization Form". And right below that is the link to the DEA that allows you to apply for this form. Application of this form involves an on-site visit from a dea affiliate to verify your company.
Also swim contacted a distributer of p-benzo and questioned them about why p-benzo has this "strange dea form request" next to it. The answer received: "well im not exactly sure why but the dea contacted us and..."
So companys are watching p-benzo, and the h2o2 method of synthing benzo seems to fail many bees. How watched is Sodium Chlorate? Swims read posts on here that refer to how it can be used in bombs?


  • Guest
« Reply #32 on: October 25, 2003, 02:40:00 AM »
If any source has a huge, strangely specific disclaimer or requires any type of mailed in form or special permission for a chemical...they aren't a source.  They are simply a re-layer of private information. This puts the bee in a compromising position which is totally avoidable. Let them sell to someone else..dont give them a cent. There are PLENTY of other guys with the same stuff out there.
Most photo companies dont bat an eye at selling 1-5 lb quantities of hydroquinone for $6/lb. This in turn can be converted nearly quantitatively into a VERY pure product. IMHO it pays to scrounge up a few pinches of Iodine, Tech grade H2O2, and some Isopropyl.  Much more efficient, and fool-proof than the O2.  Not to mention the fun, and satisfaction of producing your own reagents.


  • Guest
From Aniline
« Reply #33 on: October 25, 2003, 04:00:00 AM »
From Perkin's and Kipping's Organic Chemistry  :)

Quinone or benzoquinone is usually prepared by oxidizing aniline with potassium bichromate and sulfuric acid:

   Aniline (1 part) is dissolved in water (25 parts) and sulfuric acid (8 parts), and finely powdered potassium bichromate (3.5 parts) gradually added, the whole being well cooled during the operation; the product which is very dark colored, owing the the presence of aniline black, extracted with ether, the ether evaporarted, and the crude quinone purified by recrystallization from light petroleum or by sublimation



  • Guest
lugh: swim found a synth on google talking...
« Reply #34 on: October 25, 2003, 06:44:00 AM »
lugh: swim found a synth on google talking about using hydroquinone and KBro3. Not too scientific although.


Willy that was the idea. Make the benzo cuz theres no reason to ever take a risk at all ordering anything shady when it can be made, practically otc, easily. Swim read the synth with the h2o2 and i2 and figured it would be the best way to go since it seemed simple and it was discussed a pretty good bit on the hive. Well now swims done the synth exactly as specified 3 times and all swims gotten was quinhydrone. ??? The only thing different swim is doing is the setup.  Swims using
a 1 litre erlenmeyer with a 3" octaganol stirbar sittin in a waterbath stirrin at full speed most of the time. Swims usin a clasien to fit the addition funnel and therm obviously. Swims done the synth 2 times regularly, and 1 time at a 2 time scale up. After recrystalizaion the pic above is the same shit swims been getting consistently. The one time swim let the second 3 hour part of the synth stir at 45 degrees for close to 5 hours to make sure everything reacted. Still got the same thing. What the fuck is swim doin wrong?  :(  Is there any advice anyone can offer swim?


  • Guest
more advice...
« Reply #35 on: October 25, 2003, 07:03:00 AM »
homeslice... I've done this synth only twice but both times I've had bright yellow p-benzo as the result. I kept records of everything I did exactly, I will type them up here when I get the chance...

One thing I remember off the top of my head:

My addition funnel was leaking h2o2 so I ended up dumping it all in within 5 or 10 minutes and the temp shot up very high... wait till I get the details. send me a pm to remind me.

Heres a pic of my 2nd synth:


  • Guest
do this
« Reply #36 on: October 25, 2003, 02:14:00 PM »
Just add the H2O2 as fast as it will go in w/o boiling over.  Then keep your solvent at just near boiling (60-75) for about 1 1/2 hours.  All reactants should be liquified.  Put flask in freezer- yellow crystals.


  • Guest
blaaky that looks like a human brain lol
« Reply #37 on: October 25, 2003, 07:17:00 PM »
blaaky what the fuck is that lol

swims always looked like a dark red, dark maroon mixture, with the yellow swirlies ive read about. it never really went completely watery like liquified. it always stayed somewhat thicker, kind of like um.... oversaturated water with sugar, ya know how it gets like syrupy? Chilly can you do a little writeup of what your explaining in your last post? What should i follow from the original synth? Does swim need to keep temp at 30 degrees for 3 hours or is that retarded? so keep it at 60-75 for 1 to 1.5 hrs. I have a good sep funnel should i add dropwise just fast enough to put the temp at 60?
Could someone explain how this is working? I understand the h2o2 is oxidating the hydroquinone to form quinhydrone, then with further oxidation and agitation the quinhydrone forms para-benzoquinone. How does the temperature affect the turn from quinhydrone into p-benzo?


  • Guest
« Reply #38 on: October 25, 2003, 07:57:00 PM »
Not trying to be a grouch or anything, and I'm no moderator- but this thread is starting to run itself ragged. Everything you wanted to know about this reaction is either linked or described rather thoroughly within the posts.  I also already pasted a writeup about this reaction within this thread a few posts back.....


  • Guest
Study More Chemistry
« Reply #39 on: October 26, 2003, 01:34:00 AM »

How does the temperature affect the turn from quinhydrone into p-benzo?

C_W is right, the answer to this question can bee found in a thread from the last few weeks, namely

Post 464029

(Pimpo: "reflux and reactivity?", Newbee Forum), as well as many other posts about kinetics, and at the beginning of any initial organic chemistry course  ::)  You are attempting to practice organic chemistry, and to succeed in that pursuit, you need to understand some basic principles, which you could learn by following some of the very helpful links posted in the sticky threads, or downloading Vogel's as suggested  :)  Thus this thread is being locked, you need to start reading a lot more  ;)