Process for the preparation of carbazole

US5760247A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Albert Schnatterer · Leverkusen, DE
• Helmut Fiege · Leverkusen, DE
• Joerg-Dietrich Jentsch · Mülheim, DE
• Eberhard Zirngiebl

Key dates

• Filing date: May 20, 1997
• Grant date: Jun 2, 1998
• Expiry date: May 20, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D209/86
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Diphenylamine can be dehydrocyclized on noble metal catalysts in the liquid phase at temperatures of 200.degree. to 340.degree. C. The reaction proceeds with a surprisingly high selectivity.