Selective hydrosilylation of alkynes and ketones: contrasting reactivity between cationic 3-iminophosphine palladium and nickel complexes
作者:Hosein Tafazolian、Robert Yoxtheimer、Rajendr S. Thakuri、Joseph A. R. Schmidt
DOI:10.1039/c7dt00832e
日期:——
hydrosilylation of alkynes and ketones has been explored utilizing palladium- and nickel(allyl) complexes supported by 3-iminophosphine ligands. Palladium and nickel demonstrated distinctly different reactivity profiles, with palladium proving very effective for the hydrosilylation of electron-deficient alkynes, while nickel excelled with ketones and internal alkynes. Additionally, in many cases, regioselective
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Synthesis of Benzofused-Siloles
作者:Liam D. Curless、Michael J. Ingleson
DOI:10.1021/om501033p
日期:2014.12.22
a weak base forms silafluorenes with H2 as the only byproduct. Attempts to extend this approach to synthesize siloles derived from 2,2′-bithiophenes and N-Me-2-Ph-indole resulted in competing reactivity, including protodesilylation. B(C6F5)3 also catalyzed the one-pot, two-step formation of silaindenes from aryl-alkynes by alkyne trans-hydrosilylation, followed by an intramolecular Sila-Friedel–Crafts
由B(C 6 F 5)3和弱碱催化的2-(SiR 2 H)-联苯的脱氢硅烷化反应形成了以H 2为唯一副产物的硅芴。尝试将该方法扩展为合成由2,2'-联噻吩和N -Me-2-Ph-吲哚衍生的甲硅烷导致竞争的反应性,包括原去甲硅烷基化。B(C 6 F 5)3还催化了炔烃的反式氢化硅烷化作用,由芳基炔烃一锅,两步形成硅氢化茚,然后通过弱碱促进了分子内Sila-Friedel-Crafts反应。
Modular Approach to Reductive C<sub>sp2</sub>–H and C<sub>sp3</sub>–H Silylation of Carboxylic Acid Derivatives through Single-Pot, Sequential Transition Metal Catalysis
modular approach to catalytic reductive Csp2–H and Csp3–H silylation of carboxylic acid derivatives encompassing esters, ketones, and aldehydes. Choice of either an Ir(I)/Rh(I) or Rh(I)/Rh(I) sequence leads to either exhaustive reductive ester or reductiveketone/aldehyde silylation, respectively. Notably, a catalyst-controlled direct formation of doubly reduced silyl ethers is presented, specifically
Highly efficient regioselective hydrosilylation of allenes using a [(3IP)Pd(allyl)]OTf catalyst; first example of allene hydrosilylation with phenyl- and diphenylsilane
作者:Hosein Tafazolian、Joseph A. R. Schmidt
DOI:10.1039/c4cc09804h
日期:——
A [(3IP)Pd(allyl)]OTf complex was shown to function efficiently and regioselectively in allene hydrosilylation with phenyl- and diphenylsilane. The catalyst also proved to be highly active for allene hydrosilylation employing a wide range of silanes, each of which produced a single regioisomer.