Process for the preparation of 3,5-dialkyl-4-hydroxy benzoic acid
AssigneeCiba-Geigy Corporation
InventorsStephen D. Pastor, John D. Spivack, Paul Odorisio
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Abstract
An improved process for the preparation of 3,5-dialkyl-4-hydroxybenzoic acid comprising the reaction of 2,6-dialkylphenol and carbon dioxide in the presence of a mono- or polyalkylene glycol ether.
Claims5
A process for preparing 3,5-dialkyl-4-hydroxybenzoic acid which consists essentially of converting 2,6-dialkylphenol to the corresponding phenolate in the presence of an alkali or alkaline-earth metal hydroxide, hydride or amide and a mono- or polyalkylene glycol ether selected from the group consisting of ethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether, reacting the resulting phenolate with carbon dioxide at a temperature of from about 30.degree.-60.degree. C. and isolating the 3,5-dialkyl-4-hydroxybenzoic acid.
Dependencies are inferred from the claim text.