Carbonyl and olefin hydrosilylation mediated by an air-stable phosphorus(<scp>iii</scp>) dication under mild conditions
作者:Ryan J. Andrews、Saurabh S. Chitnis、Douglas W. Stephan
DOI:10.1039/c9cc02460c
日期:——
The readily-accessible, air-stable Lewis acid [(terpy)PPh][B(C6F5)4]21 is shown to mediate the hydrosilylation of aldehydes, ketones, and olefins. The utility and mechanism of these hydrosilylations are considered.
已显示出易于获得的,空气稳定的路易斯酸[(terpy)PPh] [B(C 6 F 5)4 ] 2 1可介导醛,酮和烯烃的氢化硅烷化。考虑了这些氢甲硅烷基化的效用和机理。
The Highly Lewis Acidic Dicationic Phosphonium Salt: [(SIMes)PFPh
<sub>2</sub>
][B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>4</sub>
]
<sub>2</sub>
作者:Michael H. Holthausen、Meera Mehta、Douglas W. Stephan
DOI:10.1002/anie.201403693
日期:2014.6.16
The dicationic imidazolium‐phosphoniumsalt [(SIMes)PFPh2][B(C6F5)4]2 has been prepared and shown to exhibit remarkable Lewis acidity in stoichiometric reactions and acting as an effective Lewisacid catalyst for the hydrodefluorination of fluoroalkanes and the hydrosilylation of olefins.
制备了咪唑鎓‐盐[(SIMes)PFPh 2 ] [B(C 6 F 5)4 ] 2,在化学计量反应中显示出显着的路易斯酸性,可作为有效的路易斯酸催化剂用于氟代烷烃的加氢脱氟和烯烃的氢化硅烷化。
Silicon(II) Cation Cp*Si:<sup>+</sup>X<sup>–</sup>: A New Class of Efficient Catalysts in Organosilicon Chemistry
作者:Elke Fritz-Langhals
DOI:10.1021/acs.oprd.9b00260
日期:2019.11.15
The catalytic activity of the pentamethylcyclopentadienylsilicon(II) cation Cp*Si:+ was investigated. It was shown that Cp*Si:+ efficiently catalyzes reactions of technical relevance in organosiliconchemistry: Cp*Si:+ proved to be a very efficient nonmetallic catalyst for the hydrosilylation of olefins at low catalyst amounts of <0.01 mol % and for the Piers–Rubinsztajn reaction in order to make controlled
Homogeneous catalytic hydrosilylation of the CC double bond in the presence of transition metalcatalysts
作者:Rita Skoda-Földes、László Kollár、Bálint Heil
DOI:10.1016/0022-328x(91)83201-e
日期:1991.5
Hydrosilylation of unsaturated esters and other vinyl- and vinylidene type olefins has been carried out with PtCl2(PhCN)2, RhCl(PPh3)3 and platinum-phosphine catalysts. With PtCl2(PhCN)2 and platinum(0)-phosphine complexes as catalysts the hydrosilylation of methyl methacrylate gave the linear product 2a, whereas in the RhCl(PPh3)-catalyzed reaction the silyl ketene acetal derivative 4a was formed
Olefin Isomerization and Hydrosilylation Catalysis by Lewis Acidic Organofluorophosphonium Salts
作者:Manuel Pérez、Lindsay J. Hounjet、Christopher B. Caputo、Roman Dobrovetsky、Douglas W. Stephan
DOI:10.1021/ja410379x
日期:2013.12.11
= 0, 1) exhibit Lewis acidity derivedfrom a low-lying σ* orbital at P opposite F. This acidity is evidenced by the reactions of these salts with olefins, which catalyze the rapid isomerization of 1-hexene to 2-hexene, the cationic polymerization of isobutylene, and the Friedel-Crafts-type dimerization of 1,1-diphenylethylene. In the presence of hydrosilanes, olefins and alkynes undergo efficient hydrosilylation
式 [(C6F5)(3-x)Ph(x)PF][B( )4] (x = 0, 1) 的有机氟鏻盐表现出路易斯酸性,源自低位 σ* 轨道在 P 与 F 相对这种酸性通过这些盐与烯烃的反应得到证明,烯烃催化 1-己烯快速异构化为 2-己烯、异丁烯的阳离子聚合以及 1,1-二苯基乙烯的 Friedel-Crafts 型二聚反应。在氢硅烷的存在下,烯烃和炔烃发生有效的氢化硅烷化催化作用,生成烷基硅烷。该机制的实验和计算考虑与氢硅烷在不饱和 CC 键上的顺序活化和 1,2-加成一致。