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Pure Appl. Chem., 2008, Vol. 80, No. 5, pp. 903-911

Metal carbonyl complexes and chirality

Susan E. Gibson, Karina A. C. Kaufmann, Jennifer A. Loch and Ayako Miyazaki

Department of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, UK

Abstract: A study of the Pauson-Khand reaction (PKR) based on Co2(CO)8 and binap has revealed that a key precatalyst is (binap)Co2(CO)6, and that alkynes add to this species to generate isomers that interconvert under typical PKR conditions. A 31P NMR study of (binap)(N-(prop-2-enyl)-N-(prop-2-ynyl)-p-toluenesulfonamide)Co2(CO)4 revealed that heating this species gives rise to an unexpected cobalt hydride species (binap)Co(CO)2H together with (binap)Co2(CO)6. Observation of a PKR reaction by 31P NMR spectroscopy revealed that the hydride species is generated during the course of the reaction.