Hydrosilylation of epoxides catalyzed by a cationic η1-silane iridium(iii) complex
作者:Sehoon Park、Maurice Brookhart
DOI:10.1039/c0cc05714b
日期:——
Cationic silane complex 2, catalyzes the hydrosilylation of epoxides and cyclic ethers to give the silyl-protected alcohols, regioselectively. A mechanistic study shows that the epoxide undergoes isomerization to the ketone, followed by hydrosilylation.
A Convenient and Efficient Rhenium-Catalyzed Hydrosilylation of Ketones and Aldehydes
作者:Hailin Dong、Heinz Berke
DOI:10.1002/adsc.200900246
日期:2009.8
The easily available rhenium(I) complex [Re(CH3CN)3Br2(NO)] catalyzes the homogeneous hydrosilylation of a great variety of organic carbonyl compounds (ketones and aldehydes). The reaction is quite sensitive to the solvent applied. Chlorobenzene was found to be superior over all the other solvents used. Various aliphatic and aromatic silanes were tested. Excellent yields were achieved at 85 °C in chlorobenzene
易于获得的rh(I)络合物[Re(CH 3 CN)3 Br 2(NO)]催化多种有机羰基化合物(酮和醛)的均相氢化硅烷化。该反应对所施加的溶剂非常敏感。发现氯苯优于所用的所有其他溶剂。测试了各种脂肪族和芳香族硅烷。使用三乙基硅烷,在85°C的氯苯中,获得了优异的收率,该反应的TOF值高达495 h -1。提出了可能的氢化硅烷化反应机理。
Mechanism for Reduction Catalysis by Metal Oxo: Hydrosilation of Organic Carbonyl Groups Catalyzed by a Rhenium(V) Oxo Complex
作者:Elon A. Ison、Evan R. Trivedi、Rex A. Corbin、Mahdi M. Abu-Omar
DOI:10.1021/ja055704t
日期:2005.11.1
evaluated. Complex 3 was found to be less hydridic than Et3SiH, refuting its participation in catalysis. A viable mechanism that is consistent with experimental findings, rate measurements, and kineticisotopeeffects (Et3SiH/Et3SiD = 1.3 and benzaldehyde-H/benzaldehyde-D = 1.0) is proposed. Organosilane is activated via eta2-coordination to rhenium, and the organic carbonyl adds across the coordinated Si-H
Rhodium-Catalyzed, Efficient Deutero- and Tritiosilylation of Carbonyl Compounds from Hydrosilanes and Deuterium or Tritium
作者:Miguel Rubio、Jesús Campos、Ernesto Carmona
DOI:10.1021/ol202117t
日期:2011.10.7
A cationic rhodium compound which is an active catalyst for both the hydrogen isotope exchange in hydrosilanes and the hydrosilylation of carbonyl compounds permits, in a one-flask, two-step procedure, efficient deutero- and tritiosilylations using SiEt3H under D-2 (0.5 bar) or T-2, at low catalyst loadings (0.1-0.5 mol%).
Controlled Hydrosilylation of Carbonyls and Imines Catalyzed by a Cationic Aluminum Alkyl Complex
作者:Jürgen Koller、Robert G. Bergman
DOI:10.1021/om2008277
日期:2012.4.9
The synthesis, characterization, and unprecedented catalytic activity of cationic aluminum alkyl complexes toward hydrosilylation are described. X-ray crystallographic analysis of Tp*AlMe2 (1) and [Tp*AlMe][I-3] (3) revealed the preference of Al for a tetrahedral coordination environment and the versatility of the Tp* ligand in stabilizing Al in bi- and tridentate coordination modes. [Tp*AlMe][MeB(C6F5)(3)] (2) is highly active toward the hydrosilylation of a wide variety of carbonyls and imines, thus providing an inexpensive and versatile alternative to late transition metal catalysts.