PROCESS FOR THE PREPARATION OF A HYDROXYPHENYLCARBOXYLATE

摘要

Process for the preparation of a hydroxyphenylcarboxylate Pentaerythrityl tetrakis-¢3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate is prepared by transesterifying a lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of a basic catalyst, without addition of an inert solvent and in a 15 to 50 % excess of lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate over the stoichiometric amount of 4 moles per 1 mole of pentaerythritol. An extremely good yield of pure crystalline product is obtained by the process of the invention.