The Rates of the Hydrogenation of the Coordinated Styrene and Acrylonitrile in a Rhodium-Olefin Complex [RhClH2(ol)(PPh3)2]

Abstract

Abstract Kinetics of the hydrogenation of coordinated styrene and acrylonitrile in a rhodium-olefin complex RhClH2(ol)(PPh3)2 (ol=styrene or acrylonitrile) was studied by stopped-flow method and by the direct measurements of hydrogen-gas uptake. The equilibrium constant of the reaction RhCl(ol)(PPh3)2+H2\ightleftharpoonsRhClH2(ol)(PPh3)2, K34, and the rate of the hydrogenation of the olefin in the complex RhClH2(ol)(PPh3)2, k45, were determined to be 3.2×103 mol−1 dm3 and 2.7 s−1 for styrene, and 3.5×102 mol−1 dm3 and 0.50 s−1 for acrylonitrile, respectively. The differences in the values for these two olefins were discussed. The data for cyclohexene were also briefly mentioned.