Method for making aromatic bisphenols

US4931594A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Joachim Knebel · Zwingenberg, DE
• Volker Kerscher · Reinheim, DE
• Werner Ude · Darmstadt, DE

Key dates

• Filing date: Oct 26, 1988
• Grant date: Jun 5, 1990
• Expiry date: Oct 26, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2603/18
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for making aromatic bisphenols such as 9,9-bis-(4-hydroxyphenyl)fluorene by reacting an aromatic ketone, for example a diaryl ketone or diaryl diketone, with a phenol in the present of an insoluble strongly acidic cationic ion exchange resin as an acidic condensation catalyst, which latter may be used in the presence of a co-catalyst containing sulfur.