Separación de isómeros de metanfetamina mediante ácido tartárico

[Osmosis Vanderwaal]

@G.Patton Tengo algunos problemas con este proceso que espero que puedas explicarme.
No se menciona el D-meth-D-tartato ni el l-meth-l-tartato. Estos son los estereoisómeros ópticamente activos y no he visto ninguna prueba o mecanismo que sugiera que no se formen. Al ser los estereoisómeros ópticamente activos, cristalizarían a mayor temperatura (es decir, antes) que los inactivos. El orden sería: D,D; L,L; D,L; L,D.
¿Por qué NO sería más rentable y eficaz utilizar SÓLO ácido l-tartárico, los isómeros naturales, y eliminar los cristales de ,l l-meth del rm antes de concentrar y cristalizar?

 

[G.Patton]

Esto se debe a obstáculos espaciales. No se pueden formar. Esto se describe en la literatura con otros ejemplos de aminas. Búsquelo si le interesa.

Usted puede, depende de usted. El resultado será el mismo.

 

[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