申请人:Daicel Chemical Industries, Ltd.
公开号:EP0916642A1
公开(公告)日:1999-05-19
A highly pure hydroquinone dietser derivative can be produced from the reaction product of ketoisophorone with an acylating agent in a high yield by a simple and easy operation. In the presence of an acid catalyst, a cyclohex-2-ene-1,4-dione derivative shown by the following formula (3) was allowed to react with an acylating agent (e.g., acetic anhydride), and the reaction product was purified by crystallization to obtain a hydroquinone diester derivative shown by the following formula (1). The compound (1) contains about 0 to 4% by weight of a catechol diester derivative represented by the following formula (2), being highly pure. As a solvent for crystallization, a mixed solvent of an organic carboxylic acid (e.g., acetic acid) corresponding to the acylating agent and water may be used.
In the formulae, R1 and R2 each represents an alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group.
通过简单易行的操作,可从酮基异佛尔酮与酰化剂的反应产物中高产制得高纯度对苯二酚衍生物。在酸催化剂存在下,下式(3)所示的环己-2-烯-1,4-二酮衍生物与酰化剂(如乙酸酐)反应,反应产物经结晶纯化,得到下式(1)所示的对苯二酚二酯衍生物。化合物(1)含有约 0% 至 4% (按重量计)下式(2)所示的邻苯二酚二酯衍生物,纯度很高。作为结晶溶剂,可使用与酰化剂相应的有机羧酸(如乙酸)和水的混合溶剂。
式中,R1 和 R2 分别代表烷基、环烷基、芳基或杂环基。