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The reactions of substituted pyrroles with terminal acylacetylenes occur selectively to form 2-(Z/E-2-acylvinyl)pyrroles. When the reactions are performed on the surface of silica get, C-vinylation is noticeably accelerated to lbrm predominantly E-isomers. ESR spectroscopy with the use of a spin trap demonstrated the ion-radical character of the process. The structures of the adducts synthesized, which exist as anti-s-cis-and &vn-s-cis-rotamers, were studied by IR. UV, and NMR spectroscopy.

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