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Highly Regio‐ and Stereoselective Hydrosilylation of Alkynes Catalyzed by Tridentate Cobalt Complexes
Author(s) -
Kong Degong,
Hu Bowen,
Chen Dafa
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900577
Subject(s) - hydrosilylation , regioselectivity , chemistry , catalysis , alkyne , markovnikov's rule , cobalt , yield (engineering) , stereoselectivity , medicinal chemistry , organic chemistry , polymer chemistry , materials science , metallurgy
Several cobalt complexes bearing tridentate (NNN) ligands were synthesized and served as precatalysts for alkyne hydrosilylation with Ph 2 SiH 2 . For terminal alkynes, the catalyst L2 b‐CoCl 2 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‐CoCl 2 exhibited the best activity, and afforded E ‐selective vinylsilanes through syn ‐addition in excellent yield under mild conditions.