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Author Topic: Short Questions Thread  (Read 10820 times)

hypnos

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Re: Short Questions Thread
« Reply #1020 on: September 20, 2011, 01:22:19 AM »
"The mm wacker suggests distiling the post extraction dcm off with condensors etc, is this really required? I'm thinking an open vessel in warm h2o bath would suffice and be faster?"

 Each have their pros and cons,,e.g, PRO: not having to superclean glassware with acid..CON not so good for solvent recovery and Smell !!! safety etc etc etc
"the two things you can give away and never lose, are what you know, and how you feel...."

hypnos

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Re: Short Questions Thread
« Reply #1021 on: September 20, 2011, 01:34:35 AM »
Quote
Or if anyone has a viable route to thionyl chloride

cant it be found in certain batteries??? hint ;)
"the two things you can give away and never lose, are what you know, and how you feel...."

Terror

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Re: Short Questions Thread
« Reply #1022 on: September 20, 2011, 04:56:43 AM »
cheers hypnos - I was thinking given the BP of DCM there's not really any chance of anything being lost in an open vessel, and DCM is dirt cheap for me...
Confidence and arrogance are easily confused, but only one breeds contempt.

hypnos

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Re: Short Questions Thread
« Reply #1023 on: September 20, 2011, 05:59:27 AM »
yeah if it less than about 50 ml of many solvents can go a long way pretty quickly, think "discretion?!!"
And some of the are quite pungent, to say the least...

cheers hyppy
"the two things you can give away and never lose, are what you know, and how you feel...."

Terror

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Re: Short Questions Thread
« Reply #1024 on: September 22, 2011, 08:14:16 AM »
My mdp2p pre vacum distill looks alot like the attached, is that cool? Roidrage said red ketone works...
Confidence and arrogance are easily confused, but only one breeds contempt.

hypnos

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Re: Short Questions Thread
« Reply #1025 on: September 22, 2011, 10:57:40 AM »
 sounds ok to me also..RR, knows his stuff 8) having had many similar dreams, pardon me RR, for not mentioning this,,in fact I know you  "know More about" this particular Rxn than I--as that Man says terror, you'll be fine. I'm sorry If I came off somehow, as "more knowledgeable" than the RageR  :o .......terror just coz I have 'More posts means Nada' and that goes for almost everyone here almost, but for the top  10 or so High numbered posters, and with time you will see we Often have Different Types of Dreams,  If you know what I mean, in fact,, probably some of the "so called Newbies" on THIS forum, ARE in Fact, some of the smartest,people here, So Dont Be Fooled by the BIG Numbas, And whats more, I WILL ONLY SAY, what I KNOW to be OK or I would tell you that " I wasn't sure, and that maybe you should ask so n so or somewhere esle in the forum",,If you think I can help,please,still feel free to ask

As Far as I an concerned, this Is a Place to "Share the Love" so dont be shy if you need an idea or hint ;) 8)

None of us Need OR Want to get stuffed around with-I realized I had given you a "poor quality answer", and it Needed Improvement, AFTER RR posted below, and I saw the "mistake" i had made, for want of a better word! posting a "too simple"  YES, yeah I know it sound funny, but if you ever get into "Cognitive Behavioral Psychology" you'll understand it easier...maybe,maybe not :o sorry, I was in a hurry and should have waited (PATIENCE) before rushing that off while you're sitting with a bottle full of juicy p2p,,I can be a thoughtless fuckwit at times!!! :o :o :o ??? ::)

take is slowly you'll do fine "haste makes waste" More than almost ANYTHING in Organic, and other chemistry, as well as Life , in general, Patience IS a Virtue, in this game 8) as it Also IS in Life Too ;) 8)

G hard matey ;)

hyppy 8)
« Last Edit: September 23, 2011, 10:12:48 PM by hypnos »
"the two things you can give away and never lose, are what you know, and how you feel...."

RoidRage

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Re: Short Questions Thread
« Reply #1026 on: September 22, 2011, 12:24:40 PM »
Terror, it's fine ;)

reDEEMed

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Re: Short Questions Thread
« Reply #1027 on: September 24, 2011, 03:15:09 AM »
What the most feasible method for the home hack such as myself to prepare concentrated HCl starting with muriatic acid? I know distillation is out of the question, but maybe some other method of dehydration might work. I have read about bubbling HCl gas through as well. At what percentage is the solution considered to be 'concentrated'? Are there any ways to check the percentage? Titration? How do some of you titrate?

I've already blown one experiment were I substituted concentrated for muriatic (iirc 37% but not sure) and the result were so far from what I expected there is no doubt that muriatic is not strong enough.

"Ego is a structure that is erected by a neurotic individual who is a member of a neurotic culture against the facts of the matter. And culture, which we put on like an overcoat, is the collectivized consensus about what sort of neurotic behaviors are acceptable."
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Enkidu

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Re: Short Questions Thread
« Reply #1028 on: September 26, 2011, 10:14:27 AM »
Can anyone find the specific energy of combustion of naphthalene?

dream0n

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Re: Short Questions Thread
« Reply #1029 on: September 26, 2011, 10:25:59 PM »
"Specific Heats" aka Specific Energy   1.72  (kJ/kg.K)   Not sure if this is exactly what you are looking for, as in I'm unsure about "Combustion".
off to bigger and better things - don't worry I will visit from time to time

Enkidu

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Re: Short Questions Thread
« Reply #1030 on: September 28, 2011, 07:50:11 AM »
Does anyone have a good paper on the decomposition of oxalic acid? It decomposes when used to reduce imines (eschweiler-clark), when used to in the beckmann rearrangement, and apparently during the preparation of hydroxylamine from a nitroalkane. I've always wonder about it's utility in the Lossen..
« Last Edit: September 28, 2011, 07:55:08 AM by Enkidu »

hypnos

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Re: Short Questions Thread
« Reply #1031 on: September 28, 2011, 08:09:47 AM »
what about these?  hxxp://www.oecd-nea.org/trw/docs/mol98/postersession/POSTSpaper10.pdf
and hxxp://pubs.acs.org/doi/abs/10.1021/j100789a032 ?

 Although both are primarily about gaseous phase kinetics of these compounds, they are quite interesting, and the second paper, Does suggest, that this is to discern their behaviour in various states---at the very least, there are the references, They used!!!

 I Hope they are of some assistance/help,  enkidu

Hyppy
"the two things you can give away and never lose, are what you know, and how you feel...."

reDEEMed

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Re: Short Questions Thread
« Reply #1032 on: September 29, 2011, 02:39:34 AM »
What's it mean when they say O-methyl so and so? It sounds as if there is a methyl group attached to an oxygen or perhaps an oxygen is exchanged for a methyl group, but that doesn't match the pictures that are beside the places where I'm reading O-methyl.
"Ego is a structure that is erected by a neurotic individual who is a member of a neurotic culture against the facts of the matter. And culture, which we put on like an overcoat, is the collectivized consensus about what sort of neurotic behaviors are acceptable."
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RoidRage

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Re: Short Questions Thread
« Reply #1033 on: September 29, 2011, 02:50:09 AM »
You're right. O-methylation means there is a methyl group attached to an oxygen (methoxy group).

reDEEMed

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Re: Short Questions Thread
« Reply #1034 on: September 29, 2011, 04:25:40 AM »
Perhaps the context of what I was reading at the time would help.

From "The chemistry of Hydroxylamines, Oximes and Hydroxamic Acids"
6. Synthesis of oximes and hydroxamic acids[/b]
Quote
In 2002, Kanno and Taylor30 successfully developed a simple one-pot procedure using
MnO2 /NH2 OMežHCl for the conversion of activated primary alcohols into O-methyl
oximes (Scheme 11).

This caught my attention because monomethylation has been of interest lately. I wasn't sure if this somehow meant I could add a methyl to an oxime where I wanted it to be on the finished compound, mostly in the 5th ring position since the 5-Meo interests the shit out of me.  The drawings did not show a methyl attached to any oxygen, so I was holding on to the hope that maybe this was something I was looking for.
"Ego is a structure that is erected by a neurotic individual who is a member of a neurotic culture against the facts of the matter. And culture, which we put on like an overcoat, is the collectivized consensus about what sort of neurotic behaviors are acceptable."
— Terence McKenna

RoidRage

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Re: Short Questions Thread
« Reply #1035 on: September 29, 2011, 04:39:45 AM »
I undestand what you says, but from what I understand, you would still have to find a way to O-methylate your hydroxylamine as they're producing the O-methylated oxime with methoxyamine hydrochloride( O-methylhydroxylamine hcl).

reDEEMed

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Re: Short Questions Thread
« Reply #1036 on: September 29, 2011, 05:43:56 AM »
That helps, thanks!
"Ego is a structure that is erected by a neurotic individual who is a member of a neurotic culture against the facts of the matter. And culture, which we put on like an overcoat, is the collectivized consensus about what sort of neurotic behaviors are acceptable."
— Terence McKenna

heisenberg

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Re: Short Questions Thread
« Reply #1037 on: October 01, 2011, 07:05:59 PM »
What would happen if one tried a sandmeyer reaction on tryptamine? Which nitrogen would be affected? Would protecting the indolic nitrogen avoid its reactivity?
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Bluebottle

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Re: Short Questions Thread
« Reply #1038 on: October 01, 2011, 11:45:29 PM »
http://127.0.0.1/talk/index.php/topic,748

But I think the diazonium salt might cyclise a la Pictet Spengler. Anybody's guess.
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Enkidu

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Re: Short Questions Thread
« Reply #1039 on: October 02, 2011, 01:16:29 AM »
Quote from: heisenberg on October 01, 2011, 07:05:59 PM
What would happen if one tried a sandmeyer reaction on tryptamine? Which nitrogen would be affected? Would protecting the indolic nitrogen avoid its reactivity?

http://127.0.0.1/talk/index.php/topic,748.msg8837.html#msg8837

IIRC, the sandmeyer fucks with the indolic N, but that is a side reaction
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