Process for preparing aromatic hydroxy-carboxylic acid alkyl est

Details Process for preparing aromatic hydroxy-carboxylic acid alkyl est Process for preparing aromatic hydroxy-carboxylic acid alkyl est

1975-02-12

1977-10-04

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

2603475, 560 56, C07C 6976

Patent

active

040524388

ABSTRACT:
An improved process for the preparation of aromatic hydroxycarboxylic acid alkyl esters had been found which avoids working with organic solvents and especially avoids the formation of alkyl ether compounds by reaction of the dialkyl sulfate with the phenolic hydroxy groups. The final products are obtained in a high selectivity and with high yields. The novel process is carried out by esterification of an aromatic hydroxy-carboxylic acid with a dialkylsulfate in an aqueous medium at a pH-value in the range of from about 4 to 6.5, preferably at a temperature in the range of from 40.degree. to 80.degree. C, and it may advantageously be used as a subsequent reaction of a technically suitable carboxylation process of aromatic hydroxy compounds by esterification of its aromatic hydroxy-carboxylic acid final compounds.

REFERENCES:
roberts & Caserio, Basic Principles of Organic Chem.

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