Dimethyl-and diphenylsilylene add stereospecifically to cis-and trons-2-butene to give the corresponding siliranes. Easy additions to cyclopentene and cyclohexene indicate that the cycloadditions are cis. Opening of the siliranes by methanol also occurs in stereospecifically cis fashion.

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Szammary Dimethylsilylene, generated by photolysis of THE strength of the silicon-oxygen bond1 makes reactions of silylenes with oxygen-containing compounds of particular interest. We report here the first reaction of divalent dodecarnethylcyclohexasilane, reacts with alkyl ally1 ethers to give alkoxyallyldimethylsilanes.