Cobalt-Catalyzed Alkyne Hydrosilylation and Sequential Vinylsilane Hydroboration with Markovnikov Selectivity
作者:Ziqing Zuo、Ji Yang、Zheng Huang
DOI:10.1002/anie.201605615
日期:2016.8.26
pyridinebis(oxazoline) cobalt complex is a very efficient precatalyst for the hydrosilylation of terminal alkynes with Ph2SiH2, providing α‐vinylsilanes with high (Markovnikov) regioselectivity and broad functional‐group tolerance. The vinylsilane products can be further converted into geminal borosilanes through Markovnikov hydroboration with pinacolborane and a bis(imino)pyridine cobalt catalyst.
Cobalt-Catalyzed (<i>E</i>)-Selective<i>anti</i>-Markovnikov Hydrosilylation of Terminal Alkynes
作者:Caizhi Wu、Wei Jie Teo、Shaozhong Ge
DOI:10.1021/acscatal.8b01410
日期:2018.7.6
regioselective and stereoselective hydrosilylation of terminalalkynes with catalysts generated from bench-stable Co(acac)2 and bisphoshpine ligands. The cobalt catalyst precursors are activated by the reaction with hydrosilanes, and air-sensitive activators, such as Grignard reagents or NaBHEt3, are not required for catalyst activation. A wide range of aromatic and aliphatic terminalalkynes underwent this
Highly Regio‐ and Stereoselective Hydrosilylation of Alkynes Catalyzed by Tridentate Cobalt Complexes
作者:Degong Kong、Bowen Hu、Dafa Chen
DOI:10.1002/asia.201900577
日期:2019.8
Several cobalt complexes bearing tridentate (NNN) ligands were synthesized and served as precatalysts for alkyne hydrosilylation with Ph2SiH2. For terminal alkynes, the catalyst L2 b‐CoCl2 was selected, and resulted in the corresponding α‐vinylsilanes with high (Markovnikov) regioselectivity and extensive functional‐group tolerance. For internal diaryl alkynes, the catalyst L2 c‐CoCl2 exhibited the