Heteroatom-free arene-cobalt and arene-iron catalysts for hydrogenations.

Abstract

75 years after the discovery of hydroformylation, cobalt catalysts are now undergoing a renaissance in hydrogenation reactions. We have evaluated arene metalates in which the low-valent metal species is--conceptually different from heteroatom-based ligands--stabilized by π coordination to hydrocarbons. Potassium bis(anthracene)cobaltate 1 and -ferrate 2 can be viewed as synthetic precursors of quasi-"naked" anionic metal species; their aggregation is effectively impeded by (labile) coordination to the various π acceptors present in the hydrogenation reactions of unsaturated molecules (alkenes, arenes, carbonyl compounds). Kinetic studies, NMR spectroscopy, and poisoning studies of alkene hydrogenations support the formation of a homogeneous catalyst derived from 1 which is stabilized by the coordination of alkenes. This catalyst concept complements the use of complexes with heteroatom donor ligands for reductive processes.

• Authors: Dominik Gärtner, Alice Welther, Babak Rezaei Rad, Robert Wolf, Axel Jacobi von Wangelin
• Journal: Angewandte Chemie (International ed. in English) (Angew Chem Int Ed Engl) Vol. 53 Issue 14 Pg. 3722-6 (Apr 01 2014) ISSN: 1521-3773 [Electronic] Germany
• PMID: 24616276 (Publication Type: Journal Article)
• Copyright: © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chemical References

• Ligands
• Cobalt
• Iron

Topics

• Catalysis
• Cobalt (chemistry)
• Hydrogenation
• Iron (chemistry)
• Ligands