Process for preparing 3-chloroanthranilic alkyl esters of high purity from 3-chloroanthranilic acid

US5557005A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• G unther Semler · Kelkheim, DE
• Michael Meier · Frankfurt am Main, DE

Key dates

• Filing date: May 24, 1995
• Grant date: Sep 17, 1996
• Expiry date: May 24, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/22
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing 3-chloroanthranilic alkyl esters by reacting 3-chloroanthranilic acid, in an inert solvent, with from 0.8 to 5 parts by weight of phosgene, and reacting the 3-chloroisatoic anhydride which is formed with an alkanol, where appropriate in the presence of an esterification catalyst, to give the 3-chloroanthranilic alkyl ester.