Reaction of acetyltris(trimethylsilyl)silane with methyllithium at -80-degrees-C gave 1-isopropyl-2-(2-propenyl)-tetrakis(trimethylsilyl)disilane, which can be best explained by head-to-head dimerization of a silene intermediate arising from the Peterson-type reaction. Benzoyltris(trimethylsilyl)silane also reacted with methyllithium to give 1-(1-phenylethenyl)-2-(1-phenylethyl)-1,1,2,2-tetrakis(trimethylsilyl)disilane and (E)-3,4-dimethyl-3,4-diphenyl-1,1,2,2-tetrakis(trimethylsilyl)-1,2-disilacyclobutane. The reaction of pivaloyltris(trimethylsilyl)silane with methyllithium afforded products arising from the cleavage of an acyl-silicon bond.