behavior could be attributable to the participation of different catalytic active species. Indeed, 1H NMR studies of the reaction of 2a with HSiMe(OSiMe3)2 evidenced the formation of a new hydrido-bridged binuclear complex, namely [Rh(SiMe(OSiMe3)2)(κ-C,C′-R-NHC-(CH2)3Si(OiPr)3)]2(μ-H)2} (R = 2-methoxyphenyl, 3), featuring orthometallated NHC and terminal silyl ligands, which has been proposed as the resting
铑(I)-NHC(NHC = N-杂环卡宾)络合物[Rh(Cl)(COD)(2-
甲氧基苯基-NHC- (CH 2)3 Si(OiPr)3)](2a)催化溶剂- HSiMe(OSiMe 3)2使
苯乙酮发生游离均质氢化
硅烷化。动力学研究表明2a的行为与相关的均相催化剂[Rh(Cl)(COD)(R-NHC-(CH 2)3 Si(OiPr)3)]不同(R = 2,6-二异丙基苯基(2b); R = 2-甲氧基乙基(2c))。此行为可能归因于不同催化活性物质的参与。确实是1的反应的1 H NMR研究2A与HSiMe(OSiMe 3)2证实一个新的氢基-桥连的双核络合物,即[
铑(森达(OSiMe形成3)2)(κ- ç,Ç '-R-NHC -(CH 2)3 Si(OiPr)3)] 2(μ-H)2 }(R = 2-
甲氧基苯基,3),具有正
金属化的NHC和末端甲
硅烷基
配体,已被提议作为氢化
硅烷化反应中的静止物种2a催化HSiMe(OSiMe