Process for the preparation of N-substituted nitro-p-phenylenediamines

US5414128A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Willi Steckelberg · Hofheim, DE
• Rolf Muller · Karben, DE
• Peter Koch · Frankfurt, DE

Key dates

• Filing date: Dec 3, 1992
• Grant date: May 9, 1995
• Expiry date: Dec 3, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C213/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of compounds of the general formula I ##STR1## by reaction of compounds of the general formula II ##STR2## with amines of the general formula III ##STR3## wherein R.sup.1 and R.sup.2 independently of one another denote hydrogen, (C.sub.1 -C.sub.4)-alkyl, C.sub.1 -C.sub.4)-hydroxyalkyl or (C.sub.5 -C.sub.6)-cycloalkyl, or, together with the nitrogen atom carrying them, form (C.sub.4 -C.sub.6)-heterocyclyl and R.sup.3 and R.sup.4 independently of one another denote hydrogen, (C.sub.1 -C.sub.4)-alkyl, (C.sub.1 -C.sub.4)-hydroxyalkyl, (C.sub.1 -C.sub.2)-alkylcarbonyl or tosyl.