Process for the preparation of 2,2'-dichloro- hydrazobenzene

Details Process for the preparation of 2,2'-dichloro- hydrazobenzene Process for the preparation of 2,2'-dichloro- hydrazobenzene

B - Operations, Transporting

01

J

260/591.1

B01J 31/28 (2006.01)

Patent

CA 1111449

PROCESS FOR THE PREPARATION OF 2,2'-DICHLORO-HYDRAZOBENZENE Abstract of the disclosure: The catalytic hydrogenation of o-nitro-chlorobenzene in aqueous alkali metal hydroxide solution with addition of an aromatic non-watermiscible solvent at an elevated tempe- rature and under pressure using a noble metal catalyst and a polycyclic quinone as a co-catalyst leads to high and well- reproducible yields of 2,2'-dichloro-hydrazobenzene when the quinone is a derivative of anthraquinone, especially a hy- droxy-anthraquinone. The product is obtained in so high a quality that it can be transformed without isolation or purification into 3,3'-dichlorobenzidine.

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