Preparation of chlorinated violanthrones or isoviolanthrones

US5554774A · kind A · utility

Assignee

• BASF SE

Inventors

• Udo Bergmann · Darmstadt, DE
• Gerhard Sch afer · Heidelberg, DE
• Heinrich Kowarsch · Oberderdingen, DE

Key dates

• Filing date: Feb 10, 1995
• Grant date: Sep 10, 1996
• Expiry date: Feb 10, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B3/32
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Chlorinated violanthrones or isoviolanthrones are prepared by reacting violanthrone or isoviolanthrone with chlorine in the presence of a diluent, using aliphatic carboxylic acids and/or aliphatic halo carboxylic acids as diluent for this purpose.