Reaction Pathways and Redox States in α-Selective Cobalt-Catalyzed Hydroborations of Alkynes.

Authors :: Blasius CK
Vasilenko V
Matveeva R
Wadepohl H
Gade LH
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2020 Dec 14; Vol. 59 (51), pp. 23010-23014. Date of Electronic Publication: 2020 Oct 15.
Publication Year :: 2020
Abstract: Cobalt(II) alkyl complexes supported by a monoanionic NNN pincer ligand are pre-catalysts for the regioselective hydroboration of terminal alkynes, yielding the Markovnikov products with α:β-(E) ratios of up to 97:3. A cobalt(II) hydride and a cobalt(II) vinyl complex appear to determine the main reaction pathway. In a background reaction the highly reactive hydrido species specifically converts to a coordinatively unsaturated cobalt(I) complex which was found to re-enter the main catalytic cycle.<br /> (© 2020 The Authors. Published by Wiley-VCH GmbH.)

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