Synthesis and Catalytic Reactivity of Cobalt Pincer Nitrosyl Hydride Complexes.

Organometallics

Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria.

Published: January 2021

The synthesis, characterization, and catalytic activity of low-spin {CoNO} pincer complexes of the type [Co(PCP)(NO)(H)] are described. These compounds are obtained either by reacting [Co(PCP)(κ-BH)] with NO and EtN or, alternatively, by reacting [Co(PCP)(NO)] with boranes, such as NH·BH in solution. The five-coordinate, diamagnetic Co(III) complex [Co(PCP-Pr)(NO)(H)] was found to be the active species in the hydroboration of alkenes with anti-Markovnikov selectivity. A range of aromatic and aliphatic alkenes were efficiently converted with pinacolborane (HBpin) under mild conditions in good to excellent yield. Mechanistic insight into the catalytic reaction is provided by means of isotope labeling, NMR spectroscopy, and APCI/ESI-MS as well as DFT calculations.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7842137PMC
http://dx.doi.org/10.1021/acs.organomet.0c00755DOI Listing

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