Novel aromatic o-hydroxyaldehydes, a process for their preparation and their utilization

US4002630A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Theodor Papenfuhs · Frankfurt, DE
• Helmut Troster · Königstein, DE

Key dates

• Filing date: Jul 22, 1975
• Grant date: Jan 11, 1977
• Expiry date: Jul 22, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D471/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Novel aromatic o-hydro-aldehydes of the formula ##STR1## have been found wherein each X is a carboxy group or both X together are a group of the formula ##STR2## wherein R stands for hydrogen, an optionally substituted amino group, optionally etherified hydroxy group, an optionally substituted aliphatic, cycloaliphatic, aromatic or heterocyclic radical, and A for an optionally substituted phenylene or naphthylene radical. They are valuable intermediate products for the preparation of dyestuffs, optical brighteners, textile auxiliaries and pharmaceutica and are particularly suitable for the preparation of azo-methine dyestuffs which are obtained by condensation of these aldehydes with suitable amines.