Direct Immobilization of Ru-Based Catalysts on Silica: Hydrogen Bonds as Non-Covalent Interactions for Recycling in Metathesis Reactions
Résumé
The commercially available M71-SIPr ruthenium precatalyst was deposited on silica, with the aim to develop a simple procedure for catalyst recovery in metathesis reactions. Various spectroscopic analyses revealed that the impregnation resulted from hydrogen bonding interactions, specifically with the carbonyl group of the trifluoroacetamide moiety of the complex. These interactions were, furthermore, responsible for catalytic improvement through a facilitated release of the active ruthenium species. The silica-supported complex proved to be an efficient catalyst for the promotion of various olefin metathesis reactions in a multisubstrate procedure. The catalytic material was easily recovered by simple filtration and delivered the targeted products in high yield for seven consecutive runs