Preparation of 1,4-diaminoanthraquinone-2,3-disulfonic acid and 1,4-diaminoanthraquinone-2,3-dinitrile

US5386042A · kind A · utility

Assignee

• BASF SE

Inventors

• Matthias Dust · Ludwigshafen, DE
• Udo Bergmann · Darmstadt, DE
• Gerd Schwantje · Monsheim, DE

Key dates

• Filing date: Jul 8, 1993
• Grant date: Jan 31, 1995
• Expiry date: Jul 8, 2013

Classification

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

Abstract

1,4-Diaminoanthraquinone-2,3-disulfonic acid (I) is prepared by reacting 1,4-diamino-2,3-dihaloanthraquinone (II) with boric acid in an inert organic solvent and further reacting the resulting reaction product (IIa) with an aqueous sulfite solution, by a method in which the inert organic solvent used is a nonpolar solvent having a boiling point of .gtoreq.130.degree. C. and a density of .ltoreq.0.95 g/cm.sup.3, and 1,4-diaminoanthraquinone-2,3-dinitrile (III) is prepared by reacting the 1,4-diaminoanthraquinone-2,3-disulfonic (I) with a cyanide.