Base Metal Catalysts for Photochemical C–H Borylation That Utilize Metal–Metal Cooperativity
摘要:
Heterobimetallic Cu-Fe and Zn-Fe complexes catalyze C-H borylation, a transformation that previously required noble metal catalysts. The optimal catalyst, (IPr)Cu-FeCp(CO)(2), exhibits efficient activity at 5 mol% loading under photochemical conditions, shows only minimal decrease in activity upon reuse, and is able to catalyze borylation of a variety of arene substrates. Stoichiometric reactivity studies are consistent with a proposed mechanism that exploits metal-metal cooperativity and showcases bimetallic versions of the classical organometallic processes, oxidative addition and reductive elimination.
Carbene-9-BBN Ring Expansions as a Route to Intramolecular Frustrated Lewis Pairs for CO<sub>2</sub>Reduction
作者:Tongen Wang、Douglas W. Stephan
DOI:10.1002/chem.201304870
日期:2014.3.10
Reactions of phosphine‐derived carbenes with 9‐borabicyclo[3.3.1]nonane (9‐BBN) result in ring‐expansionreactions to generate novel intramolecular frustrated Lewis pairs (FLPs). These FLPs effect the catalytic reduction of CO2 in the presence of boranes to give BOB and methoxy‐borate species.