The reduction of carbonyl compounds by means of hydrogen sulfide under pressure under the presence of MoS
3 was investigated. Benzil, benzophenone and 9-fluorenone were reduced to the corresponding hydrocarbons, and sulfur-containing materials were scarcely produced. These reactions were promoted by the addition of such catalyst as
p-toluene-sulfonic acid. In the case of benzaldehyde, however, the main product was benzylmercaptane and a very small amount of toluene was obtained. In the reaction of a carbonyl compound which has a hydrogen atom on the α-position of the carbonyl group, a sulfur-containing condensation material was produced as the main product.
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