Hydrogenolysis of Polychlorobenzenes Catalyzed by Metallic Nickel

Mutsuji SAKAI*, Akira INOUE and Yasumasa SAKAKIBARA

Department of Polymer Science and Engineering, Kyoto Institute of Technology;
Matsugasaki, Sakyo-ku, Kyoto-shi 606-0962 Japan

In a closed reaction vessel, chlorobenzenes were exclusively hydrodechlorinated to give benzene in the presence of zinc powder, water, sodium hydroxide, and a catalytic amount of metallic nickel in ethanol under nitrogen atmosphere. The reaction was accelerated by adding excess zinc powder, water, and stoichiometric amount of sodium hydroxide to the catalyst system. Water was a hydrogen source and sodium hydroxide was a trapping reagent of hydrochloric acid produced. A probable reaction pathway was presented.

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