Rozdzielanie izomerów metamfetaminy za pomocą kwasu winowego

Osmosis Vanderwaal

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@G.Patton Mam kilka problemów z tym procesem i mam nadzieję, że będziesz w stanie mi je wyjaśnić.
Nie ma wzmianki o D-met-D-winianu lub l-met-l-winianu. Są to optycznie czynne stereoizomery i nie widziałem żadnych dowodów ani mechanizmów sugerujących, że one nie powstają. Będąc optycznie aktywnymi stereoizomerami, krystalizowałyby one w wyższej temperaturze (tj. wcześniej) niż te nieaktywne. Kolejność byłaby następująca: D,D; L,L; D,L; L,D.
Dlaczego NIE byłoby bardziej opłacalne i wydajne użycie TYLKO kwasu l-winowego, naturalnie występujących izomerów, i usunięcie kryształów l-metalu z rm przed zatężeniem i krystalizacją?
 

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Wynika to z przeszkód przestrzennych. Nie można ich tworzyć. Jest to opisane w literaturze z innymi przykładami amin. Poszukaj, jeśli jesteś zainteresowany.

Możesz, to zależy od ciebie. Wynik będzie taki sam.
 

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EveryoneHatesCris

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Okay?
 

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Osmosis Vanderwaal

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@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?
 

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

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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
 

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

Osmosis Vanderwaal

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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
 

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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.
 

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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
 
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