Process for production of aromatic aldehydes

US4978802A · kind A · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Philippe Campo · Montigny-le-Bretonneux, FR
• Panayotis Cocolios · Rambouillet, FR
• Paul Dognin · Paris, FR
• Henry Ledon · Versailles, FR

Key dates

• Filing date: Dec 20, 1988
• Grant date: Dec 18, 1990
• Expiry date: Dec 20, 2008

Classification

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

Abstract

Aromatic aldehydes are produced by oxidation with oxygen of a para-cresol derivative in a solvent, in the presence of a base and a catalytic amount of a cobalt compound. The catalyst is a chelated complex of cobalt with a rigid structure that is slightly oxidizable selected from the group consisting of bis-(4-methylpyridine isoindolinato)cobalt(II) acetate, phthalocyaninatocobalt(II), and sulfophthalocyaninanatocobalt(II). The process is particularly suited to the production of p-hydroxy benzaldehydes.