Preparation of nitrobenzophenones, and a color-stable modification of a benzophenone-azopyridone dye

US5364972A · kind A · utility

Assignee

• BASF SE

Inventors

• Helmut Degen · Bischofswerda, DE
• Norbert Zimmerman · Waldsee, DE
• Ralf Brueckmann · Putlitz, DE
• Gunther Lamm · Haßloch, DE
• Arno Lange · Bad Dürkheim, DE
• Helmut Reichelt · Neustadt, DE

Key dates

• Filing date: Sep 23, 1992
• Grant date: Nov 15, 1994
• Expiry date: Sep 23, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0029
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing nitrobenzophenones by reaction of benzene or its derivatives with nitrobenzoyl chloride in the presence of a Lewis acid, a color-stable modification of 1,4-dimethyl-5-cyano-3-[4-(2,4-dimethylbenzoyl)phenylazo]-2-hydroxy-6-pyri done and its use for dyeing or printing synthetic fiber material are described.