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
The hydrosilylation is one of the most important methods for the synthesis of organosilicon compounds. Karstedt's catalyst [Ptn(H2C=CHSiMe2OSiMe2CH=CH2)m] is a kind of platinum catalyst which is widely used in the hydrosilylation. In this paper, we studied the catalytic activity of Karstedt's catalyst for the hydrogenation of olefins and especially aminated alkenes with trimethoxysilane and triethoxysilane
nes are obtained in quantitative yields after reaction times of 30 min to several hours depending on the nature of the metal carbonyl, olefin structure, and reaction temperature. Hydrosilylation of vinyl- and isopropenyl-o-carboranes occurs only at 20–30°C over 2–3 days, yields of the corresponding silanes being 20–35%. On interaction of triethoxysilane and allylamine, silylation of the nitrogen atom
基数类型烯烃的氢化硅烷化,R'CHCH 2(R'= C 3 H ^ 7 C 10 ħ 21,C 6 H ^ 5,硅(CH 3)3,CH 2 N(CH 3)2,CH 2 N [为Si(OC 2 H ^ 5)3 ] 2和环戊二烯与硅烷,HSIR“ ñ X 3- ñ(ñ = 1或2,R”= CH 3或C 2 H ^ 5,X =氯; ñ描述了在羰基催化金属Co 2(CO)8和Rh 4(CO)12的存在下= O,X = Cl,OC 2 H 5),描述了烷基氯(乙氧基)硅烷,R'CH 2 CH 2 SiR ” n X 3- n和环戊烯基氯(乙氧基)烷基硅烷在反应时间为30分钟至几小时后,以定量产率获得,具体取决于羰基金属的性质,烯烃结构和反应温度。乙烯基-和异丙烯基-o的氢化硅烷化-碳硼烷仅在20–30°C下发生2-3天,相应硅烷的收率为20–35%。在三乙氧基硅烷和烯丙基胺相互作用时,氮原子的
(Dicyclopentadiene) platinum(II) dichloride: An efficient catalyst for the hydrosilylation reaction between alkenes and triethoxysilane
(Dicyclopentadiene) platinum(II) dichloride was found to be an efficient hydrosilylation catalyst (homogeneous) upon a wide variety of functionalized alkenes and alkenes terminated with chemical moieties (diphenyl amino-, N-carbazol- and N-isoindoline-1,3-dione-). It is noteworthy that the hydrosilylation of aminated alkenes with triethoxysilane exhibited the yield of over 70% and the selectivity (γ-isomer/β-isomer)