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

1978-07-25

1980-08-12

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260578, C07C10904

Patent

active

042173078

ABSTRACT:
The catalytic hydrogenation of o-nitro-chlorobenzene in aqueous alkali metal hydroxide solution with addition of an aromatic non-watermiscible solvent at an elevated temperature 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 hydroxy-anthraquinone. The product is obtained in so high a quality that it can be transformed without isolation or purification into 3,3'-dichlorobenzidine.

REFERENCES:
patent: 3156724 (1964-11-01), Werner et al.
patent: 3527805 (1970-09-01), Pregazlia et al.

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