专利号:US-8383835-B2 优先权日:2007-12-26 标 题 :Process for the production of cyclic diesters of alpha-hydroxyacids 发明人:WAJC SAMUEL J; WAUTIER HENRI 权利人:KTANTON LTD; WAJC SAMUEL J; WAUTIER HENRI 摘要:Process for the synthesis of a cyclic diester of an alpha-hydroxyacid, comprising the following steps:n 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.