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Kinetics of the reaction between acetylene and phenylmagnesium bromide were investigated in diethyl ether in the presence of
small additions of triethylamine and without a catalyst. The mechanistic scheme suggested by Grignard et al. was supplemented
with the reaction of bromomagnesiumacetylene with the Grignard reagent. The rate constants for individual reactions were
determined. Triethylamine catalyzes the reactions to different extents, the conversions of bromomagnesiumacetylene being the
most susceptible to the catalysis. The possible ways of the action of the catalyst were discussed and the importance of nucleophilic
assistance was stressed. © 1999 Elsevier Science S.A. All rights reserved.
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