Preparation and purification process of cyclic ester

摘要

Disclosed herein are a process for preparing a cyclic ester by the use of an alpha -hydroxycarboxylic acid or an alpha -hydroxycarboxylic acid ester as a material which comprises the step of adding an orthoester at a suitable timing, and a process for purifying the cyclic ester by adding the orthoester to the cyclic ester containing large amounts of impurities such as water and an acid component. According to the present invention, there are provided the practical preparation process and purification process for obtaining the high-purity cyclic ester containing small amounts of impurities such as water and the acid component.