1988 Volume 1988 Issue 5 Pages 705-713
Cobalt-ruthenium mixed metal catalysts have been revealed to show synergistic effect on carbonylation reactions such as homologation of methanol and hydroformylation of olefins. Especially, the catalytic activity of Co2(CO)3 for the hydroformylation of cylohexene is greatly improved by the addition of Ru3(CO)12. The hydroformylation by the bimetallic catalyst is remarkably influenced by the nature of the solvent. The synergistic effects for cobalt and ruthenium on these reactions are discussed.
A series of tetrahedral mixed metal clusters M[RuCo3(CO)12] (M=Na, Et4N, Ph4P, PPN, H) have been prepared by reaction of RuCl3 with 4 molar equiv of Na[Co(CO)4] followed by cation exchange or protonation. These clusters are also effective for above carbonylation reactions. Metallo-selective substitution reaction of CO ligand in HRuCo3(CO)12 by amines or phosphines has been discovered. The substitution of amines takes place preferentialy at the ruthenium atom whereas the substitution of phosphine occurs exclusively on the cobalt atom(s).
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