Process for the preparation of 2-amino-4-nitrophenol

US4329503A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Wolfgang Bauer · Krefeld, DE
• Klaus Kuhlein · Kelkheim, DE

Key dates

• Filing date: Jan 19, 1981
• Grant date: May 11, 1982
• Expiry date: Jan 19, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C215/76
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The process of reducing 2,4-dinitrophenol to 2-amino-4-nitrophenol by reduction with a hydrosulfide in aqueous alkaline solution at temperatures from 20.degree.-100.degree. C. is improved by maintaining the pH at 7 to 9.5 during the reduction.