Process for the preparation of 4,4'-dihalobiphenyls

US4950817A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Artur Botta · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Lothar Puppe · Burscheid, DE

Key dates

• Filing date: Mar 2, 1989
• Grant date: Aug 21, 1990
• Expiry date: Mar 2, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

4,4'-dihalobiphenyls can be prepared by catalyzed halogenation of biphenyls with halogenating agents, the catalysts used being zeolites having pore sizes of at least 5 .ANG..