%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