Catalysis by Cobalt Carbonyls

Add time:07/27/2019    Source:sciencedirect.com

Publisher SummaryTransition metal carbonyls and their derivatives are remarkably effective and varied in their ability to catalyze reactions between unsaturated molecules. The carbonyl derivatives of cobalt are particularly active catalysts for such reactions and have been put to use in the industrial synthesis of higher aliphatic alcohols. The most important reason being that dicobalt octacarbonyl is a reasonably stable, commercially available, fairly well characterized compound which easily gives active catalytic intermediates. Most of the growth in our understanding of reactions catalyzed by dicobalt octacarbonyl has resulted from a study of the individual reactions of catalytic intermediates such as cobalt hydrocarbonyl. At much lower temperatures and pressures than are used in the corresponding catalytic processes, cobalt hydrocarbonyl has been found to give rise to similar reactions, but stoichiometrically. The carbon monoxide inhibition is most easily explained if the isomerization proceeds via the tricarbonyls rather than tetracarbonyls. An equally probable hypothesis is that under Oxo conditions the combination of temperature and carbon monoxide pressure result in the branched acylcobalt tricarbonyl for the first two olefins but a linear acylcobalt tetracarbonyl for ethyl acrylate.

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