Synthesis and Catalytic Reactivity of Cobalt Pincer Nitrosyl Hydride Complexes | Zendy

Jan Pecak | Zendy; Sarah Fleissner | Zendy; Luı́s F. Veiros | Zendy; Ernst Pittenauer | Zendy; Berthold Stöger | Zendy; Karl Kirchner | Zendy

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Synthesis and Catalytic Reactivity of Cobalt Pincer Nitrosyl Hydride Complexes

Author(s) -

Jan Pecak,

Sarah Fleissner,

Luı́s F. Veiros,

Ernst Pittenauer,

Berthold Stöger,

Karl Kirchner

Publication year - 2021

Publication title -

organometallics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.231

H-Index - 172

eISSN - 1520-6041

pISSN - 0276-7333

DOI - 10.1021/acs.organomet.0c00755

Subject(s) - chemistry , pincer movement , hydroboration , catalysis , boranes , hydride , cobalt , reactivity (psychology) , selectivity , catalytic cycle , yield (engineering) , medicinal chemistry , nuclear magnetic resonance spectroscopy , organic chemistry , metal , boron , metallurgy , medicine , materials science , alternative medicine , pathology

The synthesis, characterization, and catalytic activity of low-spin {CoNO} 8 pincer complexes of the type [Co(PCP)(NO)(H)] are described. These compounds are obtained either by reacting [Co(PCP)(κ 2 -BH 4 )] with NO and Et 3 N or, alternatively, by reacting [Co(PCP)(NO)] + with boranes, such as NH 3 ·BH 3 in solution. The five-coordinate, diamagnetic Co(III) complex [Co(PCP NMe - i 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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