The thermal reactions of [MoH4(dppe)2] (1, dppe = Ph2PCH2CH2PPh2) with RSiH2X afford [MoH2X(dppe)[Ph2PCH2CH2P(Ph)C6H4-o]RXSi-P,P,Si}] (R = Ph, X = Cl (5a); R = cyclo-C6H11, X = Cl (5b); and R = Ph, X = Br (6)) by activation of the Si–H bond of the silanes and the ortho C–H bond of the phenyl group in the dppe ligand. Reduction of the Si–Cl and Mo–Cl bonds in 5a with LiAlH4 leads to the formation of the original complex 1 as a result of unusual Si–C bond cleavage. Meanwhile, dehalogenative reduction of 5a using zinc metal gives the known compound [MoH3[Ph2PCH2CH2P(Ph)C6H4-o]2(Ph)Si-P,P,P,P,Si}] (2). The experimental results reported herein provide certain evidence for the involvement of the silylene species in the unusual formation of the present polydentate phosphinoalkyl–silyl ligands.
[MoH4(dppe)2] (1, dppe = Ph2PCH2CH2PPh2) 与 RSiH2X 的热反应通过活化
硅烷的 Si–H 键和 dppe
配体中苯基的邻位 C–H 键,生成 [MoH2X(dppe)[Ph2PCH2CH2P(Ph)
C6H4-o]RXSi-P,P,Si}] (R = Ph, X = Cl (5a); R = cyclo-
C6H11, X = Cl (5b); and R = Ph, X = Br (6))。5a 中的 Si–Cl 和 Mo–Cl 键与 LiAlH4 反应,由于异常的 Si–C 键断裂,生成初始的复合物 1。同时,使用
锌金属对 5a 进行脱卤还原,得到已知的化合物 [MoH3[Ph2PCH2CH2P(Ph) -o]2(Ph)Si-P,P,P,P,Si}] (2)。本文报告的实验结果为
硅烯物种参与多齿膦烷基-
硅烷配体的异常形成提供了某些证据。