Process for manufacturing 4-hydroxy-3,5-dimethoxy benzoic acid f

Details Process for manufacturing 4-hydroxy-3,5-dimethoxy benzoic acid f Process for manufacturing 4-hydroxy-3,5-dimethoxy benzoic acid f

1979-03-23

1980-03-04

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 6504

Patent

active

041918410

ABSTRACT:
Demethylation of the 3,4,5-trimethoxybenzoic acid is carried out in the presence of an excess of alkali hydroxide in an amount of ethylene glycol just sufficient to obtain a heterogeneous medium sufficiently fluid in the course of the operation. The ethylene glycol monomethyl ether and the water formed are distilled off progressively with their production and the resulting 4-hydroxy-3,5-dimethoxybenzoic acid is separated by acidification by means of a strong acid and crystallization.

REFERENCES:
Steenken, S. et al., Chem. Abst. 86:139056s 1977.
K. Venkateswara Rao et al., Chem. Abst. 16670h 1962.
Kasztreiner, E. et al., Chem. Abstr., vol. 74, 42161m 1971.

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