A variety of trialkylsilylvinylcyclopropanes were prepared by two different routes: (a) Cyclopropanation of 1-alkenylsilanes and (b) the reactions of 1-bromocyclopropyllithium with trimethylsilyl chloride. Radical induced ringopeningreaction of these cyclopropanes were examined. 1-Dimethylphenylsilyl-2-vinylcyclopropane or 3-methyl-1-trialkylsilyl-2-vinylcyclopropane provided the corresponding homoallylic
1-Trialkylsilyl-2-vinylcyclopropane or 3-methyl-1-trialkylsilyl-2-vinylcyclopropane provided the corresponding homoallylic silane exclusively upon treatment with PhSH, Ph3SnH, or C6F13I. On the other hand, 3-phenyl-1-trimethylsilyl-2-vinylcyclopropane or 3-acetyl-1-trimethylsilyl-2-vinylcyclopropane gave allylic silane selectively.
1-三烷基甲硅烷基-2-乙烯基环丙烷或3-甲基-1-三烷基甲硅烷基-2-乙烯基环丙烷仅在用PhSH,Ph 3 SnH或C 6 F 13 I处理后才提供相应的均烯丙基硅烷。 1-三甲基甲硅烷基-2-乙烯基环丙烷或3-乙酰基-1-三甲基甲硅烷基-2-乙烯基环丙烷选择性地产生烯丙基硅烷。