photocatalytic hydrosilylation of a variety of linear and cyclic alkenes has been investigated. It was found that the freeradical type photoinitiator Irgacure 2959 had a better effect on the hydrosilylation reaction; using 3 mol% photoinitiator Irgacure 2959, higher conversion rates can be obtained in the hydrosilylation of both some internal and terminal olefins. A new green method for hydrosilylation processes
Visible Light-Driven Radical <i>trans</i>-Hydrosilylation of Electron-Neutral and -Rich Alkenes with Tertiary and Secondary Hydrosilanes
作者:Jing Zhu、Wei-Chen Cui、Shaozhong Wang、Zhu-Jun Yao
DOI:10.1021/acs.joc.8b02409
日期:2018.12.7
regio-, and stereoselective manner. Comparison of the reactivity of diene compounds and late-stage hydrosilylation of steroid drugs were also explored. Deuterium labeling experiments reveal that a stepwise formation of C–Si and C–H bonds with a trans stereochemistry is preferred, in which the thiol may behave as a hydrogen atom transfer agent.
Chemoselective Alkene Hydrosilylation Catalyzed by Nickel Pincer Complexes
作者:Ivan Buslov、Jeanne Becouse、Simona Mazza、Mickael Montandon‐Clerc、Xile Hu
DOI:10.1002/anie.201507829
日期:2015.11.23
Chemoselective hydrosilylation of functionalized alkenes is difficult to achieve using base‐metal catalysts. Reported herein is that well‐defined bis(amino)amide nickel pincer complexes are efficient catalysts for anti‐Markovnikov hydrosilylation of terminal alkenes with turnover frequencies of up to 83 000 per hour and turnover numbers of up to 10 000. Alkenes containing amino, ester, amido, ketone
The reduction of derivatives of the type RnSiσ4-n (σ = Cl, OCH3) by some organomagnesium compounds RMgX at high temperature (⩾80°) leads to the hydrosilanes RR'SiH2 and RR'2SiH in various ratios according to the considered reagents. The results described in this publication constitute a first approach in the knowledge of the mechanism of these reductions. A deeper study of the mechanism is the subject
Cationic Nickel(II)-Catalyzed Hydrosilylation of Alkenes: Role of P, N-Type Ligand Scaffold on Selectivity and Reactivity
作者:Istiak Hossain、Joseph A. R. Schmidt
DOI:10.1021/acs.organomet.0c00551
日期:2020.9.28
Seven structurally similar cationic nickel(II)–alkyl complexes were synthesized by using a series of P, N ligands, and their reactivity was explored in the hydrosilylation of alkenes. More electron-rich phosphines enhanced the overall reactivity of the transformation; in contrast, groups on the imine donor had little impact. Overall, these catalysts displayed reactivity and selectivity that was previously