Process for the production of cyclic diesters of alpha-hydroxyacids
申请人:Wajc Samuel J.
公开号:US20100267970A1
公开(公告)日:2010-10-21
Process for the synthesis of a cyclic diester of an alpha-hydroxyacid, comprising the following steps:
an alkalino-earth salt of the corresponding alpha-hydroxyacid is mixed with said alpha-hydroxyacid and water;
the mixture is treated by evaporation-crystallization, so that a hydrate of the alkalino-earth salt of the linear dimer of the corresponding alpha-hydroxyacid precipitates;
the hydrated salt is dehydrated to give the corresponding anhydrous salt; and
the anhydrous salt is pyrolyzed, releasing the cyclic diester of the corresponding alpha-hydroxyacid and leaving the alkalino-earth hydroxide as solid residue.