Hypercoordinate Ketone Adducts of Electrophilic η<sup>3</sup>-H<sub>2</sub>SiRR′ Ligands on Ruthenium as Key Intermediates for Efficient and Robust Catalytic Hydrosilation
作者:Mark C. Lipke、T. Don Tilley
DOI:10.1021/ja509073c
日期:2014.11.19
The electrophilic η(3)-H2SiRR' σ-complexes [PhBP(Ph)3]RuH(η(3)-H2SiRR') (RR' = MePh, 1a; Ph2, 1b; [PhBP(Ph)3](-) = [PhB(CH2PPh2)3](-)) are efficient catalysts (0.01-2.5 mol % loading) for the hydrosilation of ketones with PhMeSiH2, Ph2SiH2, or EtMe2SiH. An alkoxy complex [PhBP(Ph)3]Ru-OCHPh2 (4b) was observed (by (31)P(1)H} NMR spectroscopy) as the catalyst resting state during hydrosilation of benzophenone
亲电 η(3)-H2SiRR' σ-配合物 [PhBP(Ph)3]RuH(η(3)-H2SiRR') (RR' = MePh, 1a; Ph2, 1b; [PhBP(Ph)3](- ) = [PhB(CH2PPh2)3](-)) 是酮与 PhMeSiH2、Ph2SiH2 或 EtMe2SiH 的硅氢化的有效催化剂(0.01-2.5 mol% 负载)。在二苯甲酮与 EtMe2SiH 的氢化硅烷化过程中,观察到烷氧基配合物 [PhBP(Ph)3]Ru-OCHPh2 (4b)(通过 (31)P(1)H} NMR 光谱)作为催化剂的静止状态。对于使用 PhMeSiH2 或 Ph2SiH2 的反应,观察到不同的催化剂静止状态,并被鉴定为硅烷 σ-络合物 [PhBP(Ph)3]RuH[η(2)-H-SiRR'(OCHPh2)] (RR' = MePh , 5a; Ph2, 5b) 使用变温多核 NMR