Synthesis of Silirenes by Palladium-Catalyzed Transfer of Silylene

4824

Organometallics 1997, 16, 4824-4827

Synthesis of Silirenes by Palladium-Catalyzed Transfer of Silylene from Siliranes to Alkynes Wylie S. Palmer and K. A. Woerpel* Department of Chemistry, University of California, Irvine, California 92697-2025 Received June 10, 1997X

Palladium-catalyzed reactions of cis-1,1-di-tert-butyl-2,3-dimethylsilirane with disubstituted alkynes produced thermally stable silirenes in high yields (81-86%). Alkyl-, aryl-, trimethylsilyl-, and heteroatom-substituted alkynes were employed. The silirenes reacted with phenylacetylene and