Process for preparing 7-hydroxy-1,2-naphthoquinone-2-diazide-4-sulfonic acid or salts thereof

US5192640A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Siegfried Scheler · Wiesbaden, DE
• Gerhard Buhr · Königstein, DE
• Klaus Bergmann · Heilbronn, DE

Key dates

• Filing date: Aug 9, 1990
• Grant date: Mar 9, 1993
• Expiry date: Aug 9, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/26
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing 7-hydroxy-1,2-naphthoquinone-2-diazide-4-sulfonic acid or salts thereof, of the general formula Z ##STR1## is disclosed in which X=hydrogen, a metal or an ammonium group, preferably an alkali metal or alkaline earth metal, especially sodium or potassium and the ammonium group. The compounds can be used as much or as intermediates or starting materials for the production of light-sensitive compounds and radiation-sensitive mixtures and materials.