Process for manufacturing a cyclic diester of an α-hydroxy acid comprising the following steps:
a substantially anhydrous salt of a divalent metal and of an α-hydroxy acid is mixed with a strong acid, the pKa of which is less than that of the α-hydroxy acid and the salt of which with the divalent metal is hygroscopic; and
the mixture is left to react for a sufficient time in order to obtain the cyclic diester dispersed in the hygroscopic salt.
制造α-羟基酸的环脂肪二酯的过程包括以下步骤:将一种二价
金属的无
水盐和一种α-羟基酸混合,所述α-羟基酸的pKa值小于所述强酸的pKa值,且所述强酸与所述二价
金属的盐具有吸湿性;将混合物反应足够长的时间,以获得分散在吸湿性盐中的环脂肪二酯。