Process for the preparation of diphenyl ethers

US4564712A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Herbert Kuckertz · Kelkheim, DE
• Georg Schaeffer

Key dates

• Filing date: Nov 23, 1983
• Grant date: Jan 14, 1986
• Expiry date: Nov 23, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C41/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Diphenyl ethers are prepared by Ullmann reaction of alkali metal phenolates with halobenzenes in the presence of basic copper carbonate and/or copper salts of lower aliphatic carboxylic acids as catalysts. These special catalysts have a better catalytic activity than other copper catalysts known for the Ullmann reaction. The diphenyl ethers prepared or obtainable according to the invention are mainly intermediates in diverse fields such as pharmaceuticals or plant protecting agents.