Process for preparation of hydroxybenzaldehydes

Details Process for preparation of hydroxybenzaldehydes Process for preparation of hydroxybenzaldehydes

Filed on

1982-06-16

Date issued

1984-09-04

Examiner

Helfin, Bernard

Patent Class

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

SubClass

Organic compounds

SubSubClass

Oxygen containing

Other Related Categories

C07C 4545

Type

Patent

Status

active

Patent number

044698941

Description

ABSTRACT:
In a Reimer-Tiemann reaction for the preparation of a mixture of salicylaldehyde and p-hydroxybenzaldehyde, improved yield of the product and high selectivity of salicylaldehyde can be obtained when an alkali metal salt of a phenol is reacted with a reaction mixture comprised of chloroform and a slurry of an alkali metal hydroxide (preferably, in a fine powder state thereof) and an inert organic solvent and optionally, a catalytic amount of a surfactant.

REFERENCES:
patent: 3365500 (1968-01-01), Pontz
Sasson et al., Tetrahedron Letters, No. 39, (1979), 3753-3756.
Hine et al., Jour. Amer. Chem. Soc., vol. 81, (1959), 6446-6449.
Yonovich et al., Tetrahedron Letters, vol. 21, (1980), 1875-1876.
Casiraghi et al., J. C. S. Perkin I (1980), 1862-1865.

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