Preparation of hydroxybenzaldehydes

Details Preparation of hydroxybenzaldehydes Preparation of hydroxybenzaldehydes

1989-05-03

1990-10-30

Gray, Bruce

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 4500

Patent

active

049670131

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.

REFERENCES:
patent: 4273941 (1981-06-01), Kawamura et al.
patent: 4473713 (1984-09-01), Ratton
patent: 4667037 (1987-05-01), Bryant III
patent: 4695659 (1987-09-01), Andersson
Chem. Abst., vol. 108, 1988--JP 62, 153,240.
Chem. Abst., vol. 107: JP-62 155,236.

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