Chloroenamines reaction with, phosgene

Nitriles react with phosgene only in the presence of hydrogen chloride, to give either 1,2-unsaturated isocyanates or N-heterocyclic derivatives. The reactions are really those between COClj and the imidoyl chlorides or 1-chloroenamines, since these are the materials formed, reversibly, as equilibrium mixtures when hydrogen chloride adds to nitriles [2229] ... 

Reaction of phosgene with iViV-dialkylisobutyramides followed by elimination of hydrogen chloride gives vinyl halides, these substrates show high reactivity towards nucleophilic reagents, particularly on addition of silver ion. Thus electron-rich... 

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