Cobalt-Catalyzed C(sp(2))-H Borylation with an Air-Stable, Readily Prepared Terpyridine Cobalt(II) Bis(acetate) Precatalyst
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2016
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Journal Article, Journal Article
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Abstract
A bench-stable, 4-aryl-substituted terpyridine supported, high-spin cobalt(II) bis(acetate) complex, (ArTpy)Co- (OAc)2 (ArTpy = 4′-(4-N,N′-dimethylaminophenyl)-2,2′:6′,2″- terpyridine), is active for the C(sp2)−H borylation of arenes and heteroarenes with B2Pin2 (Pin = pinacolato). Optimization of the catalytic borylation reaction revealed improved performance in the presence of LiOMe and turnover numbers of up to 100 have been observed using all air-stable components. EPR specstroscopy identified formation of inactive cobalt species, promoted by excess HBPin. A high-spin cobalt(II) bis[(diacetoxy)- pinacolatoborate−κ3 O,O,O] compound has been isolated and characterized by X-ray diffraction and is the result of catalyst deactivation. Copyright © 2016 American Chemical Society
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published
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2017 (36)
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142 - 150
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American Chemical Society
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09759 - Bezdek, Máté József / Bezdek, Máté József