Production of aminonitrodihydroxyanthraquinones by partial reduction dinitrodihydroxyanthraquinones

US4048199A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Elser · Fairfax, US
• Gerhard Epple · Bad Dürkheim, DE

Key dates

• Filing date: Aug 30, 1976
• Grant date: Sep 13, 1977
• Expiry date: Aug 30, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B1/503
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The production of aminonitrodihydroxyanthraquinones of the formula: ##STR1## in which one X is OH and the other X is NO.sub.2 by partial reduction of the corresponding dinitrodihydroxyanthraquinone or mixtures thereof by heating at 80.degree.-250.degree. C in the presence of 1/2 to 5 times the weight thereof of an unsubstituted or substituted phenol. The reduction is accelerated by being carried out in the presence of a small amount such as 0.5-20 mol percent of an alkaline-reacting agent. Pure aminonitrohydroxyanthraquinones are obtained which are free from diaminodihydroxyanthraquinones.