Unusual Structure, Fluxionality, and Reaction Mechanism of Carbonyl Hydrosilylation by Silyl Hydride Complex [(ArN)Mo(H)(SiH<sub>2</sub>Ph)(PMe<sub>3</sub>)<sub>3</sub>]
作者:Andrey Y. Khalimon、Stanislav K. Ignatov、Andrey I. Okhapkin、Razvan Simionescu、Lyudmila G. Kuzmina、Judith A. K. Howard、Georgii I. Nikonov
DOI:10.1002/chem.201300376
日期:2013.6.24
hydride derivatives [(RN)Mo(H)(SiR′3)(PMe3)3] (3: R=Ar, R′3=H2Ph; 8: R=Ar′, R′3=H2Ph; 9: R=Ar, R′3=(OEt)3; 10: R=Ar, R′3=HMePh). These compounds can also be conveniently prepared by reacting [(RN)Mo(H)(Cl)(PMe3)3] with one equivalent of LiBH4 in the presence of a silane. Complex 3 undergoes intramolecular and intermolecular phosphine exchange, as well as exchange between the silyl ligand and the free
双(硼氢化物)络合物[(RN] Mo(BH 4)2(PMe 3)2 ](4:R = 2,6-Me 2 C 6 H 3 ; 5:R = 2.6,6- i PR 2 ç 6 ħ 3)与氢硅烷得到的甲硅烷新氢化衍生物[(RN)沫(H)(SIR' 3)(PME 3)3 ](3:R =氩气,R' 3 = H 2 Ph值; 8:R =中,Ar',R' 3 = H 2 Ph值; 9:R =氩气,R'3 =(OEt)3;10:R =氩气,R' 3 = HMePh)。这些化合物还可以通过使[(RN)Mo(H)(Cl)(PMe 3)3 ]与一当量的LiBH 4在硅烷存在下反应来方便地制备。配合物3进行分子内和分子间的膦交换,以及甲硅烷基配体和游离硅烷之间的交换。动力学和DFT研究表明,分子间膦交换是通过PMe 3基团的预离解而发生的,令人惊讶的是,硅烷促进了PMe 3基团的离解。分子内交换通过新的非拜拉