Process for the preparation of chloroformic acid aryl esters and cyclic carbonates

US4085129A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunther Semler · Kelkheim, DE
• Georg Schaeffer

Key dates

• Filing date: Sep 28, 1976
• Grant date: Apr 18, 1978
• Expiry date: Sep 28, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D317/70
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of chloroformic acid aryl-esters and cyclic carbonates of aryl compounds containing at least two phenolic hydroxy groups wherein aromatic compounds containing one or more hydroxy groups linked to an aromatic nucleus, are reacted with phosgene in the presence of catalytic amounts of N,N-disubstituted acid amide either under pressure or without pressure while removing the hydrogen chloride continuously from the reaction mixture. This improved process results in almost quantitative or very high yields of pure products and avoids problems such as disposal of waste water.