Process for preparing 1-amino-naphthalene-7-sulphonic acid

US4091013A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rolf Putter
• Gunther Klag · Leverkusen, DE
• Heinz U. Blank · Odenthal, DE

Key dates

• Filing date: Jul 16, 1976
• Grant date: May 23, 1978
• Expiry date: Jul 16, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/47
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1-Amino-naphthalene-7-sulphonic acid is prepared by reacting 1-chloro-naphthalene-4,7-disulphonic acid with ammonia at elevated temperatures in the presence of water and optionally in the presence of a catalyst such as a copper catalyst.