Process are the preparation of p-hydroxy-benzaldehydes

US4929766A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Albert Schnatterer · Leverkusen, DE
• Helmut Fiege · Leverkusen, DE

Key dates

• Filing date: Feb 16, 1989
• Grant date: May 29, 1990
• Expiry date: Feb 16, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/36
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

p-Hydroxy-benzaldehydes can be obtained by oxidation of the corresponding p-cresols with oxygen in the presence of basic substances in a solvent, the reaction being carried out in the additional presence of a chelate complex of iron and/or manganese. If desired, the reaction can be carried out in the presence of further metal salts.