Well-defined silica-supported zirconium–imido complexes mediated heterogeneous imine metathesis. Issue 25 (23rd February 2016) - Hamzaoui, Bilel
Abstract : Well-defined silica-supported zirconium–imido complexes effectively catalyze imine/imine cross-metathesis and are thus considered as the first heterogeneous catalysts active for imine metathesis. Abstract : Upon prolonged thermal exposure under vacuum, a well-defined single-site surface species [(Si–O–)Zr(NEt2 )3 ] (1 ) evolves into an ethylimido complex [(Si–O–)Zr(NEt)NEt2 ] (2 ). Reactions of2 with an imine substrate result in imido/imine (NRi, R: Et, Ph) exchange (metathesis) with the formation of [(Si–O–)Zr(NPh)NEt2 ] (3 ). Compounds2 and3 effectively catalyze imine/imine cross-metathesis and are thus considered as the first heterogeneous catalysts active for imine metathesis.