Process for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitro-be nzene

US5132461A · kind A · utility

Assignee

• Wella GmbH · DE

Inventors

• Thomas Clausen · Alsbach, DE
• Isolde Lowe · Bensheim, DE

Key dates

• Filing date: Dec 5, 1986
• Grant date: Jul 21, 1992
• Expiry date: Dec 5, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B51/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process is disclosed for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitro-benz ene, by means of a two-stage technique proceeding from the reaction product of 1,4-diamino-2-nitrobenzene with chloroformic acid chloroethyl ester, or by means of a multiple-stage technique which is based upon an improved process for the production of the pre-stage 4-ethylamino-1-[(2'-hydroxyethyl)-amino]-2-nitro-benzene through sulfuric acid splitting off of 4-(N-ethylarylsulfonamido)-1-[(2'-hydroxyethyl)-amino]-2-nitro-benzene.