Color-stabilized aromatic carboxylic acid chlorides and a process for their preparation

US4294777A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Bockmann · Krefeld, DE
• Karl-August Lipper · Krefeld, DE
• Friedrich Bruhne · Krefeld, DE

Key dates

• Filing date: Oct 17, 1979
• Grant date: Oct 13, 1981
• Expiry date: Oct 17, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/64
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for color stabilizing aromatic carboxylic acid chloride against discoloration which comprises introducing into a composition containing an aromatic carboxylic acid chloride 0.001 to 2% by weight of a color stabilizer, based upon the amount of said aromatic carboxylic acid chloride. The use of aldehydes, ketones, olefins, phosphorus and arsenic containing compounds are contemplated as stabilizer.