ABSTRACT
The results of the transesterification methyl ester 3-(3’, 5’-di-tert.butyl-4’- hydroxyphenyl)-propionic acid, are known and generalised by polyols in reviews [1]. However, the information bound to pentaerythrityl-tetrakis-{3-(3’, 5’-di-tert.butyl-4’-hydroxyphenyl)-propionate} is discordant and mainly based on declaring of the patent data [2-7]. The reaction pentaerythritol is step transesterification in which four bonds were formed, a yield and which interrelations changes in time. Pentaerythrityl-tetrakis-{3-(3’, 5’-di-tert.butyl-4’-hydroxyphenyl)-propionate} (Phenosan-23) [1, 7] is an effective antioxidant and it was applied in technology of the reception of a products from polymers. In this connection interest to ester exchange is bound to workings out of the methods of synthesis “Phenosan-23.” In the course of the reaction there is a viscosity augmentation that negatively influenced results and there is a necessity of rise in temperature > 120oC. At high temperatures in the conditions of alkaline catalysis oxidation and destruction processes that complicates the technology of allocation and finished the product purification become more active. Till now there are no data on the mechanism of step the transesterification and influence of intermediate products on “consumer” properties “Phenosan-23.”
