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Isolation of the first silacyclopropene, 1,1 -dimethyl-2,3diphenyl-1 -silacycloprop-2-ene, from the addition of the dimethylsilylene to diphenylacetylene was claimed by Volpin and co-workers in 1 962,2 although the product was demonstrated to be the dimer later.3 Very recently, Conlin and G a~p a r~~ and Seyferth, Annarelli, and V i~k~~ have reported that the addition of dimethylsilylene to acetylene really resulted in the formation of silacyclopropene.SiMe, RC=CRMe,Si:In a recent paper,5 we demonstrated that photolysis of styrylpentamethyldisilane gave silacyclopropane which afforded I-trimethylsilyl-l-methoxydimethylsilyl-2-phenylethane upon methanolysis. hu PhCH=CHSiMe,SiMe, -+ y y PhCH-CHSiMe,, MeOH -PhCH,CHSiMe,

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