Coordination Booster‐Catalyst Assembly: Remote Osmium Outperforming Ruthenium in Boosting Catalytic Activity

Abstract

Presented herein is as et of bimetallic and trimetallic "coordination booster-catalyst" assemblies in which the coordination complexes [Ru II (terpy) 2 ]a nd [Os II (terpy) 2 ]a cted as boosters fore nhancement of the catalytic activity of [Ru II (NHC)(para-cymene)]-based catalytic site. The boosters accelerated the oxidative loss of para-cymene from the catalytic site to generate the active catalystd uring the oxidation of alkenes and alkynes into corresponding aldehydes, ketones and diketones. It was found that the boosting efficiency of the [Os II (terpy) 2 ]u nits was considerably higher than its congener [Ru II (terpy) 2 ]u nit in these assemblies. Mechanistic studies were conducted to understand this uniquei mprovement.[a] T.