Preparation of p-aminodiphenylamines

摘要

A method of preparing p-aminodiphenylamines from diphenylamines is described whereby neither the N-nitrosodiphenylamine or the p-nitrosodiphenylamine need be isolated. The method rests on the discovery that alkali metal salts of p-nitrosodiphenylamines are soluble in non-aqueous organic solvent systems consisting of certain aromatic hydrocarbons and saturated aliphatic alcohols, and that such salts can be readily hydrogenated in their non-aqueous solution to the corresponding p-aminodiphenylamine.