afford 3,4-disubstituted silolanes is reported. The reaction sequence commences with the known B(C6F5)3-catalyzed alkene hydrosilylation with dihydrosilanes. Cleavage of the remaining Si–H bond in the hydrosilylation product assisted by B(C6F5)3 leads to formation of a cyclopropane-stabilized silylium ion. The activated cyclopropane ring is then opened by the in situ-generated borohydride accompanied
据报道,
乙烯基环丙烷和 Et 2 SiH 2的正式 (4 + 1)-环加成反应得到 3,4-二取代的
硅酮。反应顺序从已知的B(C 6 F 5 ) 3催化的烯烃与二氢
硅烷的氢化
硅烷化开始。在 B(C 6 F 5 ) 3 的帮助下,氢化
硅烷化产物中剩余的 Si-H 键断裂导致形成
环丙烷稳定的甲
硅烷离子。活化的
环丙烷环随后被原位生成的
硼氢化物打开,伴随着对
硅酮的闭环。非对映选择性通过机械模型合理化。