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。
Alkane functionalization on a preparative scale by mercury-photosensitized cross-dehydrodimerization
作者:Stephen H. Brown、Robert H. Crabtree
DOI:10.1021/ja00190a032
日期:1989.4
5-trioxacyclohexane < ethanol < isobutane < THF < Etsub3}SiH. The observed selectivities generally parallel those for homodimerization, reported in the preceding paper, but certain differences are noted, and reasons for the differences are proposed. The bond-dissociation energymore » of Etsub3}SiH is estimated from the reactivity data to be 90 kcal/mol. Eleven new carbinols are synthesized. 39 refs., 6 tabs
Alkane functionalisation on a preparative scale by mercury photosensitisation
作者:Stephen H. Brown、Robert H. Crabtree
DOI:10.1039/c39870000970
日期:——
Alkanes can be functionalised on a multigram scale by mercury photosensitised cross-dimerisation with alcohols, ethers, and silanes.
烷烃可通过与醇,醚和硅烷进行汞光敏交叉二聚化而在数克范围内官能化。
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