Clariant Corporation

Manfred Koch

Heinrich Volk

Thomas Schach

The present invention relates to a process for preparing arylhydrazines of the formula R.sup.1 R.sup.2 R.sup.3 Ar--NH--NH.sub.2 (I) by reacting an arylhydrazinedisulfonate of the formula ##STR1## in which R.sup.1, R.sup.2, and R.sup.3 are identical or different and are H, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen or OH, Ar is phenyl or naphthyl, M.sup.1 and M.sup.2 are identical or different and are H, NH.sub.4, an alkali metal or 1/2 alkaline earth metal and R.sup.1, R.sup.2, R.sup.3 and Ar in the formulae (I) and (II) have the same meaning, with water and an inorganic acid at from 0 to 100.degree. C. in the presence of an inert organic solvent to give the corresponding arylhydrazine salt and treating the arylhydrazine salt with a base.

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Eppstein-Niederjosbach, Germany

Manfred Koch