Tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use

US4705652A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Erich Hammerschmidt · Bensberg, DE
• Horst Behre · Odenthal, DE
• Heinz U. Blank · Odenthal, DE
• Dietmar Mayer · Bensberg, DE

Key dates

• Filing date: May 23, 1986
• Grant date: Nov 10, 1987
• Expiry date: May 23, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/43
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Solid crystalline tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use for the preparation of pure chromotropic acid or di-alkali metal salts of chromotropic acid.