Abstract
Some of our recent studies on the photochemical formation and reactions of silacyclopropenes are described. The silacyclopropenes can readily be obtained by two different methods, the reaction of phenyl (trimethylsilyl) silylene generated by photolysis of tris (trimethylsilyl) phenylsilane with alkynes, and photochemical isomerization of phenylethynyl-and trimethylsilylethynyldisilane derivatives. Photochemical and thermal behavior of these silacyclopropenes are discussed. The reaction of the silacyclopropenes produced from phenylethynyldisilanes with phenyl-(silyl) acetylenes in the presence of dichlorobis (triethylphosphine) nickel (II) affords siloles in high yields, while the palladium-catalyzed reaction gives 1, 4-disilacyclohexa-2, 5-dienes.
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