Abstract

Abstract In the asymmetric hydrogenation of methyl acetoacetate to methyl 3-hydroxybutyrate using Raney nickel catalysts modified with optically active hydroxy dicarboxylic acids and related compounds (for example, Y. Izumi, S. Tatsumi and M. Imaida, Bull. Chem. Soc. Japan, 39, 2223 (1966)), the relationship between the asymmetric activities of the catalysts and the chemical or stereochemical structures of modifying reagents was discussed on the basis of data obtained previously. The effects of the conditions used for modification upon the asymmetric activity were also discussed inclusively. Moreover, the stability of asymmetric activity in the modified catalysts has been found to be very excellent.

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