Process for the preparation of diphenylamines

US5196592A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Otto Immel · Krefeld, DE
• Helmut Waldmann · Leverkusen, DE
• Reinhard Langer · Krefeld, DE
• Gerhard Darsow · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE

Key dates

• Filing date: Dec 11, 1991
• Grant date: Mar 23, 1993
• Expiry date: Dec 11, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/68
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Diphenylamine, which can be substituted by lower alkyl and/or lower alkoxy, is obtained from the corresponding N-cyclohexylidene-aniline by catalytic dehydrogenation, a rhodium-containing catalyst being employed.