Process for preparing an azo compound from a 2-aminothiazole diazo component

US4046752A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Kurt Hohmann · Ybbs an der Donau, AT
• Reinhard Mohr · Offenbach am Main, DE
• Manfred Hahnke · Kelkheim, DE

Key dates

• Filing date: Jul 8, 1975
• Grant date: Sep 6, 1977
• Expiry date: Jul 8, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B44/20
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for the direct preparation of pure thiazolazo compounds had been found with the use of a 2-aminothiazole as diazo or azo component in a coupling process wherein the 2-aminothiazole used therein is subjected to the usual coupling reaction, if used as diazocomponent after diazotation, without intermediate isolation after its preparation in known manner. This process avoids the preparation of the 2-aminothiazoles as starting compounds in its solid form and the expensive purification of these instable compounds and yields now very pure azo products.