METHOD FOR PREPARING BETA-(4-HYDROXY-3,5-DI-TERTIARY-BUTYLPHENYL)PROPIONIC ACID METHYL ESTER Russian patent published in 2005 - IPC

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing β-(4-hydroxy-3,5-di-tert.-butylphenyl)-propionic acid methyl ester that represents an intermediate compound used in synthesis of highly effective thermo- and photo-stabilizing agents. Method involves interaction of 2,6-di-tert.-butylphenol with methylacrylate in the mole ratio = 1.0:(1.0-1.1) at temperature 90-145°C in the presence of catalytic complex comprising a mixture of sodium 2,6-di-tert.-butylphenolate and 2,6-di-tert.-butylphenol and wherein catalytic complex comprising sodium alkylbenzyl sulfonate and oxyethylated sodium alkylphenolate is used additionally in the following ratio of components, wt.-%: sodium 2,6-di-tert.-butylphenolate, 0.5-4.4; sodium alkylbenzyl sulfonate, 0.005-0.06; oxyethylated sodium alkylphenolate, 0.005-0.09; 2,6-di-tert.-butylphenol, the balance. Indicated alkaline components of catalytic complex are used in the amount 0.5-4.5 mole% of the amount of 2,6-di-tert.-butylphenol as measured for sum of sodium 2,6-di-tert.-butylphenolate, sodium alkylbenzyl sulfonate and oxyethylated sodium alkylphenolate. Method shows low amount of by-side substances formed, improved quality of the end product and retention of high yield, and allows reducing amount of alkaline catalyst also.

EFFECT: improved preparing method.

1 tbl, 8 ex