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When mixtures of unsaturated substances, or compounds containing multiple sites of unsaturation are hydrogenated using RhCI(PPh& as catalyst, it is possible that the substrate which reduces slowest as a single substrate can be hydrogenated preferentially in the mixture. The degree of selectivity achieved can be enhanced by the addition of polar solvents, the effects of which are discussed. The degree of participation of the two kinetically indistinguishable forward routes, Le., via substrate attack on a hydrido intermediate, or hydrogen attack on a substrate intermediate, may aho be of importance in determining the degree of selectivity achieved.* The homogeneous hydrogenation ability of RhCl(PPh& was discovered independently (1964)

Kinetics of the Reduction of Some Cobalt (III) Complexes by Chromium (II), Vanadium(II), and Europium (II)1

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