Vinyl Halides and Dihaloethanes as Synthetic Equivalents of Acetylene

4 VINYL HALIDES AND DIHALOETHANES AS SYNTHETIC EQUIVALENTS OF ACETYLENE 

Varying DMSO concentration, reactants ratio, and reaction conditions, one can carry out the process selectively, that is, to prepare either pyrroles in a yield of about 40% or their N-vinyl derivatives (35% yield). 

Like in the case with vinyl halides, the reaction, depending on the reactants ratio and conditions, can be directed towards predominant formation of non-vinylated or vinylated pyrroles [299]. 

SCHEME 1.128 Reaction of ketoximes with vinyl halides in MOH/DMSO systems. 

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