Process for preparing hydroxy-substituted aromatic aldehydes

US8609903B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ebel Klaus · Lampertheim, DE
• Stefan Rüdenauer · Weinheim, DE

Key dates

• Filing date: Apr 1, 2011
• Grant date: Dec 17, 2013
• Expiry date: Aug 9, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/65
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention therefore relates to a process for preparing an aldehyde of the formula (I)where one, two or all three radicals from the group of R1, R3 and R5 are hydroxyl, and that radical or those radicals from the group of R1, R3 and R5 which are not hydroxyl are each independently hydrogen, C1-C8-alkyl or C6-C14-aryl, and R2 and R4 are each independently hydrogen, C1-C8-alkyl, C1-C8-alkoxy or C6-C14-aryl, which comprises converting an aldehyde of the formula (II)in which one, two or all three radicals from the group of R′1, R′3 and R′5 are C1-C8-alkoxy, and that radical or those radicals from the group of R′1, R′3 and R′5 which are not C1-C8-alkoxy are each independently hydrogen, C1-C8-alkyl or C6-C14-aryl, and R2 and R4 are each as defined for formula (I), at elevated temperature and elevated pressure in the presence of (C1-C4-alkyl)2-amine, and then isolating the reaction product of the formula (I).