A silver-catalyzed carbomagnesiation of alkynes with alkyl halides and Grignardreagents afforded alkenyl Grignardreagentsregioselectively, where the alkyl group of the alkyl halide, but not that of the Grignardreagent, was introduced into the alkyne. Application to δ-haloalkylacetylenes yielded cyclopentanes or a tetrahydrofuran containing an exo-methylene substituent via 5-exo-dig cyclization