Enhanced product selectivity promoted by remote metal coordination in acceptor-free alcohol dehydrogenation catalysis
Marta Valencia1, Helge Müller-Bunz2, Robert A Gossage3
1Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland. martin.albrecht@dcb.unibe.ch and School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
Abstract:
A bimetallic [Ir(3+)]2 complex was synthesized based on a bridging 1,2,3-triazole ligand that coordinates to one Cp*Ir unit as N,N-bidentate chelate, and to the other as a C,C-bidentate ligand. When compared to monometallic homologues, the bimetallic complex shows greatly enhanced product selectivity for the acceptorless dehydrogenation of alcohols; spectroscopic and electrochemical analysis suggest significant alteration of the metal properties in the bimetallic system compared to the monometallic species, which offers a rationale for the observed high selectivity.
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