Abstract
Abstract In the asymmetric hydrogenation of methyl acetoacetate with modified Raney nickel catalysts, the effects of pH-adjusting reagents were studied using ds-tartaric acid, ls-2-hydroxyisovaleric acid, l-glutamic acid, and l-aspartic acid as the modifying reagents. The effects of various metal ions and ammonium ions were investigated at pH 5.0. The asymmetric activity of the catalyst modified with the 2-hydroxy monocarboxylic acid or 2-amino dicarboxylic acid was not affected by the pH-adjusting reagents. However, 2-hydroxy dicarboxylic acid was markedly influenced by the reagents. The univalent metal ion was more effective than divalent or ammonium ions. Sodium hydroxide was the best pH-adjusting reagent. The adsorption state of the modifying reagent was discussed on the basis of the effects of the pH-adjusting reagent.
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