Process for the preparation of 1-amino-2-bromo-4-hydroxyanthraquinone

US4741867A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Helmut Dittmer · Leverkusen, DE
• Jürgen Schneider · Kirchzarten, DE
• Hubert Schonhagen · Odenthal, DE
• Claus Krugermann · Leverkusen, DE

Key dates

• Filing date: Feb 7, 1985
• Grant date: May 3, 1988
• Expiry date: Feb 7, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2603/24
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1-Amino-2-bromo-4-hydroxyanthraquinone is obtained in good yields and in an environmentally acceptable manner by bromination of 1-aminoanthraquinone in 2 to 5 times the quantity by weight of 80 to 98% strength sulphuric acid and using 1.1-1.5 mole of bromine under elevated pressure.