Preparation of 1-nitroanthraquinone-2-carboxylic acid

US4950756A · kind A · utility

Assignee

• BASF SE

Inventors

• Jochem Henkelmann · Mannheim, DE
• Helmut Hoch
• Thomas-Michael Kahl · Münstermaifeld, DE
• Gerhard Kilpper · Battenberg, DE
• Walter Maier · Tiefenbronn, DE

Key dates

• Filing date: Oct 30, 1989
• Grant date: Aug 21, 1990
• Expiry date: Oct 30, 2009

Classification

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

Abstract

1-Nitroanthraquinone-2-carboxylic acid of the formula I ##STR1## is prepared by treating novel 2-substituted 1-nitroanthraquinones of the general formula II ##STR2## where R is --CH.dbd.CH--R.sup.1 or --CH.sub.2 --CHO, where R.sup.1 is C.sub.1 -C.sub.5 -dialkylamino or a cyclic 5- or 6-membered amine which may contain further hetero atoms, with oxidizing agents free of heavy metal.