| 摘要 |
FIELD: organic chemistry, chemical technology. ^ SUBSTANCE: invention relates to a method for preparing beta-(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 beta-(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-(beta-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 beta-(4-hydroxy-3,5-di-tert.-butylphenyl)-propionic acid methyl ester as measure for the sum of 4-(beta-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 |
