METHOD FOR PREPARING β-(4-HYDROXY-3.5-DI-TERTIARY-BUTYLPHENYL)-PROPIONIC ACID ESTERS Russian patent published in 2005 - IPC

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing β-(4-hydroxy-3,5-di-tert.-butylphenyl)-propionic acid esters that are used in industry of polymers as stabilizing agents. Method involves carrying out the process of the ester interchange reaction of β-(4-hydroxy-3,5-di-tert.-butylphenyl)-propionic acid methyl ester with polyhydric alcohols in inert gas flow at enhanced temperatures (130-190°C in the presence of the following components, wt.-%: 2,6-di-tert.-butylphenolate sodium, 1.5-3.6; 4-(β-methylcaboxyethyl)-2,6-di-tert.-butylphenolate sodium, 4.0-8.6; sodium acrylate, 2.1-6.4; 2,6-di-tert.-butylphenol, the balance. Indicated compounds of alkaline metal are used in the amount 0.4-5.1 wt.-% of the amount of β-(4-hydroxy-3,5-di-tert.-butylphenyl)-propionic acid methyl ester as measure for the sum of 4-(β-methylcarboxyethyl)-2,6-di-tert.-butylphenolate sodium, alkaline metal 2,6-di-tert.-butylphenolate and sodium acrylate. Invention provides increasing yield of the end product and its enhanced quality.

EFFECT: improved preparing method.

2 cl, 1 tbl, 10 ex