The Hydrogenation of Benzyl Catalyzed by Cobalt(II) Dimethylglyoxime Complex

Article abstract of DOI:10.1246/bcsj.59.823

Kinetic studies on the catalytic hydrogenation of benzil to benzoin by bis(dimethylglyoximato)cobalt(II), Co(Hdmg)2, were carried out by varying the concentration of Co(Hdmg)2 and pyridine.The initial rate of the hydrogenation reaction was first order with respect to the overall cobalt concentration at a constant overall pyridine concentration.On the other hand, the rate passed through a peak as the overall pyridine concentration was increased at a constant overall cobalt concentration.The peak was observed at _T=130 mmol dm^-3, where the square bracket denotes the concentration in the liquid phase.These results show that the initial reaction rate, V_in, can be expressed by the following rate equation, where k=1.1 min^-1.