Process for the preparation of terephthaloyl and isophthaloyl dichlorides

US4528146A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Bockmann · Krefeld, DE
• Friedrich Bruhne · Krefeld, DE
• Karl-August Lipper · Krefeld, DE

Key dates

• Filing date: May 12, 1983
• Grant date: Jul 9, 1985
• Expiry date: May 12, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improved process for the preparation of terephthaloyl and isophthaloyl dichlorides by chlorination of dimethyl terephthalate and isophthalate with chlorine gas at temperatures from 100.degree.-250.degree. C., optionally in the presence of light and/or catalysts promoting side-chain chlorination of aromatic compounds, according to which 20 to 200% by weight, relative to the weight of dimethyl terephthalate and/or isophthalate, of terephthaloyl and/or isophthaloyl dichloride are added to the dimethyl terephthalate and/or isophthalate for the chlorination.