A simplemethod for the hydrosilylation of olefins by using air‐stable cobalt catalysts is developed. The catalyst system is composed of simple, cheap, and readily available cobalt(II) salts and well‐defined terpyridine derivatives as cocatalysts or ligands, and the hydrosilylation processes can be processed smoothly undermildconditions without either Grignard reagents or NaHBEt3 as activator.
Manganese‐Catalyzed Hydrofunctionalization of Alkenes
作者:Jonathan R. Carney、Barry R. Dillon、Leonie Campbell、Stephen P. Thomas
DOI:10.1002/anie.201805483
日期:2018.8.13
The manganese‐catalyzed hydrosilylation and hydroboration of alkenes has been developed using a single manganese(II) precatalyst and reaction protocol. Both reactions proceed with excellent control of regioselectivity and in high yields across a variety of sterically and electronically differentiated substrates (25 examples). Alkoxide activation, using NaOtBu, was key to precatalyst activation and
锰催化烯烃的氢化硅烷化和氢硼化反应是使用单一的锰(II)预催化剂和反应方案开发的。两种反应均能很好地控制区域选择性,并能在多种空间和电子分化的底物上获得高收率(25个实例)。使用NaO t Bu进行的醇盐活化是催化剂前活化和反应活性的关键。对于这两种已开发的方法,催化剂的负载量都低至0.5 mol%,从而实现了跨各种官能团和以克为单位的催化作用。
<i>N,N</i>
‐Dimethylformamide‐protected Fe
<sub>2</sub>
O
<sub>3</sub>
Combined with Pt Nanoparticles: Characterization and Catalysis in Alkene Hydrosilylation
disclose a combination of N,N-dimethylformamide (DMF)-protected Fe2O3 nanoparticles (NPs) and Pt NPs catalyst system for the hydrosilylation of various functional alkenes and tertiarysilanes. The catalyst of DMF-protected Fe2O3/Pt NPs can be recycled for five times by a simple extraction. The developed combination Fe2O3/Pt NPs catalyst is effective up to the 1-kilogram scale.
纳米催化:我们公开了N,N-二甲基甲酰胺 (DMF) 保护的 Fe 2 O 3纳米粒子 (NPs) 和 Pt NPs 催化剂体系的组合,用于各种功能性烯烃和叔硅烷的氢化硅烷化。DMF保护的Fe 2 O 3 /Pt NPs催化剂可以通过简单的提取循环使用五次。所开发的 Fe 2 O 3 /Pt NPs 组合催化剂在 1 公斤级有效。
Bench-Stable, Substrate-Activated Cobalt Carboxylate Pre-Catalysts for Alkene Hydrosilylation with Tertiary Silanes
作者:Christopher H. Schuster、Tianning Diao、Iraklis Pappas、Paul J. Chirik
DOI:10.1021/acscatal.6b00304
日期:2016.4.1
High-spin pyridine diimine cobalt(II) bis(carboxylate) complexes have been synthesized and exhibit high activity for the hydrosilylation of a range of commercially relevant alkenes and tertiary silanes. Previously observed dehydrogenative silylation is suppressed with the use of sterically unencumbered ligands, affording exclusive hydrosilylation with up to 4000 TON. The cobalt precatalysts were readily
Oxidative cleavage of carbon–silicon bonds by dioxygen: catalysis by a flavin–dihydronicotinamide redox system
作者:Kohei Tamao、Takashi Hayashi、Yoshihiko Ito
DOI:10.1039/c39880000795
日期:——
Carbon–siliconbonds in alkoxy- or fluoro-silanes readily undergo cleavage by dioxygen (molecular oxygen), catalysed by tetra-acetylriboflavin (5–10 mol%) in the presence of N-benzyl-1,4-dihydronicotinamide as reductant, together with fluoride ions as an essential additive.