Process for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitroben zene

US4900869A · kind A · utility

Assignee

• Aktiengesellschaft Wella · DE

Inventors

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

Key dates

• Filing date: Nov 6, 1987
• Grant date: Feb 13, 1990
• Expiry date: Nov 6, 2007

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-nitrobenze ne, 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-nitrobenzene through sulfuric acid splitting off of 4-(N-ethylarylsulfonamido)-1-[(2'-hydroxyethyl)-amino]-2-nitrobenzene.