| abstract |
Process for the preparation of 4-aminodiphenylamine (ADPA) according to which aniline or substituted aniline derivatives and nitrobenzene are reacted under conditions suitable for producing 4-nitrodiphenylamine or substituted derivatives of this material and / or 4-nitrosodiphenylamine or substituted derivatives thereof and / or their salts, one or both of these materials then being reduced to produce 4-ADPA or substituted derivatives thereof. 4-ADPA or its substituted derivatives can be reductively alkylated to produce p-phenylenediamine products or substituted derivatives thereof, which have utility as anti-ozonants. According to a second embodiment, the tetrasubstituted ammonium salts or the alkyl-substituted diammonium salts of 4-nitrodiphenylamine, 4-nitrosodiphenylamine and the substituted derivatives thereof, in which each substituent of the tetrasubstituted ammonium ion is independently selected from the group consisting of alkyl, aryl and arylalkyl and each alkyl substituent of alkyl substituted diammonium salts is independently selected. |