Séparation des isomères de méthamphétamine par l'acide tartrique

[Osmosis Vanderwaal]

@G.Patton J'ai quelques problèmes avec ce processus que j'espère que vous pourrez m'expliquer.
Il n'est pas fait mention du D-méth-D-tartate ou du l-méth-l-tartate. Il s'agit des stéréoisomères optiquement actifs et je n'ai vu aucune preuve ou mécanisme suggérant qu'ils ne se forment pas. Étant les stéréoisomères optiquement actifs, ils cristalliseraient à une température plus élevée (c'est-à-dire plus tôt) que les stéréoisomères inactifs. L'ordre serait le suivant : D,D ; L,L ; D,L ; L,D.
Pourquoi ne serait-il pas plus rentable et efficace d'utiliser UNIQUEMENT l'acide l-tartrique, les isomères naturels, et d'éliminer les cristaux de méthylmercure avant la concentration et la cristallisation ?

 

[G.Patton]

Cela est dû à des obstacles spatiaux. Ils ne peuvent pas être formés. Ceci est décrit dans la littérature avec d'autres exemples d'amines. Faites une recherche si cela vous intéresse.

Vous pouvez, c'est comme vous voulez. Le résultat sera le même.

 

[EveryoneHatesCris]

Okay?

 

[Osmosis Vanderwaal]

@G.Patton I find it interesting that you are reacting ammonium chloride with sulfuric acid to make your HCL gas in this write up. I've never before heard of using that method but it is viable. Is there a reason that is preffered over the more common mixtures?

 

[G.Patton]

No difference, It's up you your local reagent availability.

 

[Osmosis Vanderwaal]

I like that there is no water to gunk up the works, like there is dehydrating HCL with H2So4. I think I'll adot this method andski the drying tube

 

[G.Patton]

It's easy to get rid of water by means of CaCl2 tube filter.

 

[Osmosis Vanderwaal]

sure, or a cold trap with H2So4 inline with the output, but if I skip that I can just have a flask, a claison adaptor with a pressure equalizing drop funnel and a hose adaptor on the side arm. 4 pieces of glass, only the drop funnel being extra from a basic distillation set

 

[prvnc]

The tartaric acid method works by selectively crystallizing d-methamphetamine as the l-tartrate salt. Control pH carefully during freebase conversion and HCl gas saturation. Hot filtration and recrystallization in ethanol boost purity but reduce yield (~30% loss normal). Always verify purity with Simon’s test. Exact tartaric acid ratios and repeat crystallizations improve results.

 

[Osmosis Vanderwaal]

theres a rule that says "a good chmist is an accurate chemist" Tartaric acid doesn't "selectively crystallise" anything. that misleading Also d-meth-l tartrate mixes more than one convention of chirality, considering
d-meth=L-Meth=R=meth=legal, and
l-meth=D-meth=S-meth=illegal

 

[FlyMcgee]

Hi, wondering if someone could shed some light on a question, I have. If someone where to follow the video on how to make the Ephedrine synthesis then do the red P/I2/Ephedrine synth could they then use that mother liquor on this d-Meth synth and obtain d-Meth? (Ice)
Cheers

 

[SoldadoDeDrogas]

It would not be necessary because when you are using ephedrine or pseudo as the starting material, the result is always pure d-isomer meth after reduction. It is when we are using P2P or another material that produces a racemic product that we are able to precipitate one of the isomers for extraction, if we choose. While leaving the other in solution.

 

[FlyMcgee]

Thanks for the info.
Another thing, what is “speed”? You know the old stuff that use to be around where it’d make you party all night. Not “ice” and wasn’t so crazy it would make you see shadow people out your window. Usually would come wet and we called it Gas or speed.

 

[SoldadoDeDrogas]

Depends who you are talking to, I guess. I usually demand for the name of a drug or chemical when people say 'it's crank or speed' or whatever.
Speed usually refering to amphetamine.. adderall, ritalin, etc. Particularly home made amphetamine.
Crank is meth that hasn't been recrystallized into ice. It looks like cocaine, white fluffy powder but it is meth.
I haven't been able to get any decent ice anywere so we resolved to DIY

 

[FlyMcgee]

Ok cheers, ok so I’ve been reading the comments on Ephedrine synthesis and they are saying you won’t get D-meth from it doing the Red p- iodine synthesis. Something about racemic and isomers ect. Can someone like G.patton please explain this to me. All I’m asking is if I follow the videos of ephedrine synthesis and the D-meth synthesis will that work or will it be a waste of time/money? Thanks heaps