Process for the preparation of 2-hydroxy-naphthalene-6-carboxylic acid

US5312976A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Volker Hautzel · Flörsheim, DE
• Siegbert Rittner · Mörfelden, DE

Key dates

• Filing date: Jul 31, 1992
• Grant date: May 17, 1994
• Expiry date: Jul 31, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

2-Hydroxy-naphthalene-6-carboxylic acid or its dipotassium salt is obtained in a good yield and purity without substantial formation of the isomeric compound 2-naphthol-3-carboxylic acid by reacting potassium .beta.-naphtholate with potassium carbonate in the presence of carbon monoxide at a temperature above 260.degree. C. in potassium formate as the solvent.