Process for the preparation of naphthalenesulphonyl chloride

US4339396A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Rauchschwalbe · Leverkusen, DE
• Karl Mannes · Leverkusen, DE
• Dietmar Mayer · Bensberg, DE

Key dates

• Filing date: Jun 26, 1980
• Grant date: Jul 13, 1982
• Expiry date: Jun 26, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for the preparation of a naphthalenesulphonyl chloride by reacting an alkali metal salt or ammonium salt of a naphthalenesulphonic acid with thionyl chloride in the presence of a catalytically active substance the improvement wherein the reaction is carried out in the presence of an optionally substituted pyridine, tertiary aliphatic amine, secondary amidine and/or quaternary ammonium salt.