it really would be a breeze, the ammonium bromide is soluble in acetone and ether. The whole mix could simply be roughly dehydrated on the rotovap then immersed in acetone. The only thing i don't know is if the meAm.HBr is also soluble in acetone, the hydrochloride salt is not, anyone know. I think the reaction would proceed better using HBr also. Might do a small trial, couldn't hurt.
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