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College of Environment & Applied Chemistry, Institute of Natural Sciences, Kyung Hee University,1 Seocheon-ri, Kiheung-up, Yongin-shi, Kyungki 449-701, KoreaReceived August 23, 20022,2'-Dichlorohydroazobenzene was prepared by selective hydrogenation of o-nitrochlorobenzene withhydrogen in the presence of 0.8% and 5% Pd/C catalyst. o-Chloroaniline was a minor product in the catalytichydrogenation of o-nitrochlorobenzene. The effects of base, Pd/C catalyst, and co-catalyst were discussed oncatalytic hydrogenation. 2,2'-Dichlorohydroazobenzene, as an intermediate, was rearranged to 3,3'-dichlorobenzidine after reacting with HCl. It was shown that selectivity of catalytic hydrogenation of o-nitro-chlorobenzene is affected strongly by concentration of base, Pd/C catalyst, and co-catalyst.

Cataytic Hydrogenation of o-Nitrochlorbenzene to 3,3'-Dichlorobenzidine