Origin of the Difference in Reactivity between Ir Catalysts for the Borylation of C-H Bonds.

ABSTRACT: A mechanistic study on the origin of the difference in reactivity between Ir catalysts for C-H borylation reactions is reported. Catalytic reactions of B₂pin₂ with a series of substrates that require high temperatures and long reaction times were conducted. These reactions catalyzed by the combination of [Ir(COD)(OMe)]₂ and 3,4,7,8-tetramethylphenanthroline (tmphen) occur in yields that are substantially higher than those of reactions catalyzed by [Ir(COD)(OMe)]₂ and 4,4'-di-tert-butylbipyridine (dtbpy). The electronic properties of Ir catalysts ligated by dtbpy or tmphen and their stoichiometric reactivity were investigated. It was found that a longer lifetime rather than higher reactivity of the catalyst leads to higher yields of reactio

SUBMITTER: Oeschger RJ 

PROVIDER: S-EPMC8865836 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature