Abstract
1. The reduction rate of cyclohexanone with alcohols in the presence of RuCl2(PPh3)3 is independent of the length of the alkyl of the 2-n-alkanol (C4-C11), or of the presence of either the sec-butyl or cyclohexyl radical, but decreases sharply when going to the 3-,4-,and 5-alkanols and 3,3-dimethyl-2-butanol. The alkylphenylcartainols reduce ketones at a much faster rate than do the 2-alkanols, and they also promote the transformation of the latter. 2. The reduction rate of ketones by alcohols, catalyzed by RuCl2(PPh3)3, decreases in the order; cyclohexanone > acetophenone > cyclopentanone > 2-hexanone ≥ cycloheptanone > cyclooctanone. 3. The catalytic activity of RhCl(PPh3)3 in the hydrogen transfer reaction is higher than that of RuCl2(PPh3)3, and the reaction rate is but slightly dependent on the structures of the alcohol and the ketone.
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