Process for preparing 4, 5-dichloro-2-methylbenzoic acid

US5886218A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Thomas Wessel · Frankfurt, DE
• Peter Koch · Frankfurt, DE

Key dates

• Filing date: Apr 30, 1997
• Grant date: Mar 23, 1999
• Expiry date: Apr 30, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C63/70
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing 4,5-dichloro-2-methylbenzoic acid and also its salts in high yields and in high purities by reacting 3,4-dichlorotoluene with acetyl chloride or chloroacetyl chloride in the presence of a Friedel-Crafts catalyst and subsequently oxidizing the acetylated intermediate to give the carboxylic acid.