Photolysis of organopolysilanes. Formation and reactions of new silacyclopropene derivatives

Abstract

The photolysis of tris(trimethylsilyl)phenylsilane (I) in the presence of diethylacetylene resulted in formation of a silacyclopropene, which could be trapped by reaction with methanol to give 3-(methoxytrimethylsilylphenylsilyl)-3-hexene in moderate yield. Similarly, irradiation of I in of 1-hexyne), trimethylsilylacetylene and bis(trimethylsilyl)acetylene led to the formation of the respective silacyclopropenes. In these cases, however, silyl-substituted alkynes arising from photorearrangement of the initially formed silacyclopropenes were obtained after methanolysis, in addition to the expected methoxysilylalkenes.