Preparation of hydroxybenzaldehydes

US4967013A · kind A · utility

Assignee

• BASF SE

Inventors

• Werner Steck · Ludwigshafen, DE
• Helmut Lermer · Ludwigshafen, DE
• Harald Rust · Bochum, DE
• Gerhard Fritz · Schifferstadt, DE
• Hardo Siegel · Speyer, DE

Key dates

• Filing date: May 3, 1989
• Grant date: Oct 30, 1990
• Expiry date: May 3, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Hydroxybenzaldehydes of the formula (I) are prepared from a benzaldehyde of the formula (II) or its acetal, in which R.sup.1 in the R.sup.1 O-phenyl ether group is an alkyl, cycloalkyl, alkylcycloalkyl or alkylaryl radical, R.sup.2 is H or OH or is identical to R.sup.1 and one or more R.sup.1 O-phenyl ether groups are ortho, meta or para to the aldehyde function, by a process in which a benzaldehyde of the formula (II) or its acetal, in which R.sup.1 and R.sup.2 have the abovementioned meanings and one or more R.sup.1 O-phenyl ether groups occupy the abovementioned position with respect to the aldehyde function, is converted into a hydroxybenzaldehyde of the formula (I) in the presence of water over a zeolite as a heterogeneous catalyst. ##STR1## The catalysts used are, in particular, zeolites of the pentasil type.