Suggestions to separate 3,4-methylendioxy-N,N dimethylampetamine from 3,4-Methylenedioxymethamphetamine

[indigoaura]

I have a sample of MDMA that is contaminated with 3,4-methylendioxy-N,N dimethylampetamine (according to lab results).

I would like to separate the contaminant 3,4-methylendioxy-N,N dimethylampetamine from the 3,4-Methylenedioxymethamphetamine.

The sample was already washed with acetone and re-crystalized, so that did not do it.

Any suggestions on how to separate the two and maintain the integrity of the MDMA?

 

[sekio]

column chromatography

 

[fastandbulbous]

Reflux with nitrous acid (potassium nitrite & hydrochloric acid). Then basify with sodium hydroxide and extract the N,N- dimethyl compound with ether. The aqueous soln should contain the nitrosoamine formed from MDMA. This can then be hydrolysed by refluxing with hydrochloric acid.
This method has one drawback; if you don't hydrolyse ALL of the nitrosoamine, you have yourself enough tip top carcinogen to ruin your life.
All things considered, column chromatography is probably a better bet, even if it is a pain in the arse...