Journal of Organometallic Chemistry p. 97 - 102 (1996)
Update date:2022-08-05
Topics:
Menashe, Naim
Salant, Einat
Shvo, Youval
The ruthenium complex (η5-C4Ph4COHOC4Ph4-η5)( μ-H)(CO)4Ru2 and its phenyl ring-substituted derivatives were found to act as efficient catalysts in reduction reactions of aldehydes and ketones to alcohols, using formic acid as H source. Excess formic acid accelerates the reaction, and the corresponding formate esters were isolated as sole products. Turnover numbers of up to 8000 (alcohols) and 11000 (formate esters) were attained, with yields in the order of 90%. Alkenes are not reactive, however, double bonds conjugated to a carbonyl group are selectively reduced under the reaction conditions. The reaction is compatible with a variety of ketones, but with aliphatic aldehydes the reaction is not selective, inasmuch as aldol condensation products are formed.
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