Process for the preparation of para-amino-diphenylamine

US4404401A · kind A · utility

Assignee

• Akzona Incorporated · US

Inventors

• Hans Zengel · Kleinwallstadt, DE
• Manfred Bergfeld · Zell am Harmersbach, DE

Key dates

• Filing date: Feb 23, 1979
• Grant date: Sep 13, 1983
• Expiry date: Feb 23, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/40
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improved process for the preparation of para-amino diphenylamine in which para-nitroso-diphenylhydroxylamine is catalytically hydrogenated in the presence of an organic solvent and one or more metal components selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium, and platinum, and their sulfidic compounds, at temperatures from 20.degree. to 200.degree. C., is disclosed. The improvement comprises utilizing as the organic solvent one or more members of the group consisting of aniline and aniline derivatives containing ring-alkyl groups, N-alkyl groups, or a combination thereof, wherein the ring-alkyl groups contain a total of 1 to 6 carbon atoms and the N-alkyl groups contain from 1 to 6 carbon atoms.