Process for the preparation of polyhydric phenols

US4324925A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christoph Jupe · Cologne, DE
• Helmut Waldmann · Leverkusen, DE
• Hermann Seifert · Bensberg, DE

Key dates

• Filing date: Jun 30, 1980
• Grant date: Apr 13, 1982
• Expiry date: Jun 30, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/82
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improved process for the preparation of a polyhydric phenol by hydroxylation of a phenol with a peroxidic hydroxylating agent, is disclosed. The improvement resides in that before the hydroxylation, all or some of the mixture to be hydroxylated is treated with a cation exchanger.