%0 Journal Article %A Léonard, Nadia G. %A Bezdek, Máté J. %A Chirik, Paul J. %D 2016 %T Cobalt-Catalyzed C(sp2)–H Borylation with an Air-Stable, Readily Prepared Terpyridine Cobalt(II) Bis(acetate) Precatalyst %U https://acs.figshare.com/articles/journal_contribution/Cobalt-Catalyzed_C_sp_sup_2_sup_H_Borylation_with_an_Air-Stable_Readily_Prepared_Terpyridine_Cobalt_II_Bis_acetate_Precatalyst/4028217 %R 10.1021/acs.organomet.6b00630.s001 %2 https://ndownloader.figshare.com/files/6486000 %K B 2 %K air-stable components %K high-spin %K catalyst deactivation %K EPR specstroscopy %K borylation reaction %K bi %K X-ray diffraction %K 4- aryl-substituted terpyridine %K cobalt species %K turnover numbers %K Ar Tpy %X 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−κ3O,O,O] compound has been isolated and characterized by X-ray diffraction and is the result of catalyst deactivation. %I ACS Publications