Elsevier

Polyhedron

Volume 7, Issues 22–23, 1988, Pages 2441-2450
Polyhedron

Cooperative effect between two metal centres in hydroformylation: Routes towards heterobimetallic catalysis

https://doi.org/10.1016/S0277-5387(00)86365-2Get rights and content

Abstract

The Rh2(μ-SR)2(CO)2L2 complexes are good catalyst precursors for the hydroformylation reaction of alkenes under mild conditions; high conversion rates are obtained, but when L is a phosphite or triphenylphosphine ligand no more than 85% of linear aldehyde is obtained for a full selectivity of the conversion of alkenes into the corresponding aldehydes. Introduction of the water-soluble P(mSO3C6 H4)3 ligand leads to 96% of selectivity in linear aldehyde and solves the problem of catalyst recovery; in this case the CO/H2 or CO/H2O couples can be used as feedstock. Various bisphosphine L2 ligands can be introduced. These include several containing a transition metal centre (Zr, Fe, Ru). The major effect observed is electronic. Extension to heterobimetallic complexes was carried out. Various rhodium-palladium complexes have been synthesized and the first results of hydroformylation show that aldehydes are produced due to the presence of the rhodium centre.

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