Process for the preparation of diarylcarbonates

US4016190A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• August Bockmann · Krefeld, DE
• Claus Wulff · Krefeld, DE
• Hugo Vernaleken · Walsrode, DE
• Wolfgang Alewelt · Krefeld, DE
• Uwe Hucks · Alpen, DE

Key dates

• Filing date: Feb 26, 1976
• Grant date: Apr 5, 1977
• Expiry date: Feb 26, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of a symmetric diarylcarbonate by reacting phosgene with a phenol wherein said reactions is carried out by the phase interface process in a diphastic mixture of an aqueous alkali metal hydroxide solution and a liquid diaryl carbonate in the presence of from 0.001 to 0.1 mol of a tertiary amine or a quaternary ammonium compound per mol of phenol.