Preparation of 3-amino-4-hydroxybenzoic acids

• Main Author: LYSENKO; ZENON
• Format: Patent
• Language: English
• Published: 30.05.1989
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

This invention is a process for the preparation of a 3-amino-4-hydroxybenzoic acid which comprises (a) contacting a p-halobenzoic acid with nitric acid in an acidic reaction medium under conditions such that a 3-nitro-4-halobenzoic acid is prepared; (b) contacting the 3-nitro-4-halobenzoic acid with...