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Reaction of tetramethylchloroformamidinium chloride (1) with methyllithium gave vinylidenebisdimethylamine (3) in good yield. Extension of this reaction to higher alkyllithiums was unsuccessful. Reactions of 1 with íerí-butyllithium and phenyllithium proceeded by radical processes. The mechanisms of these reactions, which probably involve substit uted bis (dimethylamino )methyl radicals and possibly bis (dimethylamino) carbene, are discussed.In connection with our study of the chemistry of alkyhdenebisdialkylamines (enediamines) we have been interested in developing new synthetic routes to these compounds. Two such routes have previously been(1) H.