FIELD: organic synthesis and catalysts.
SUBSTANCE: invention relates to esterification method utilizing organotitanium or organozirconium catalyst and provides catalytic composition useful in preparation of esters, including polyesters, which contains (i) product of reaction between metal M alcoholate or condensed alcoholate selected from titanium, zirconium, and hafnium alcoholates, (ii) alcohols containing at least two hydroxy groups, (iii) 2-hydroxycarboxylic acid, and (iv) base, wherein molar ratio of base to hydroxycarboxylic acid is within the range between 0.01:1 and 0.79:1. Esterification reaction in presence of above catalyst is also described.
EFFECT: avoided yellowness in final product, raised temperature for the beginning of crystallization and crystallization temperature of polyester.
14 cl, 4 tbl, 20 ex
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