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    • 1. 发明申请
    • PROCESS FOR THE PREPARATION OF 4,4'-OXYBISPHTHALIC DIANHYDRIDE
    • 制备4,4'-二氧化二硅烷的方法
    • WO1998027047A1
    • 1998-06-25
    • PCT/IL1997000415
    • 1997-12-18
    • BROMINE COMPOUNDS LTD.OREN, Jakob
    • BROMINE COMPOUNDS LTD.
    • C07C51/567
    • C07C63/68C07C51/56C07C51/567C07C65/24
    • A process for the preparation of 4,4'-oxybisphthalic dianhydride, comprises the steps of: (a) reacting a 4-halophthalic anhydride, wherein "halo-" is selected from the group consisting of bromo-, chloro-, and fluoro-, with an alkali metal hydroxide chosen from among aqueous KOH, aqueous NaOH, or a mixture thereof, to produce dipotassium- or disodium-4-halophthalate, or a mixture thereof; (b) drying said dipotassium- and/or disodium-4-halophthalate; and (c) reacting said dipotassium- and/or disodium-4-halophthalate with a 4-halophthalic anhydride, wherein "halo-" is selected from the group consisting of bromo-, chloro-, and fluoro-, in the presence of a suitable solvent and a phase transfer catalyst to give 4,4'-oxybisphthalic dianhydride.
    • 一种制备4,4'-氧邻苯二甲酸二酐的方法包括以下步骤:(a)使4-卤代邻苯二甲酸酐反应,其中“卤素”选自溴 - ,氯 - 和氟 - 与选自KOH水溶液,NaOH水溶液或其混合物的碱金属氢氧化物反应,生成2-卤代二钠或四钠盐,或其混合物; (b)干燥所述二钾和/或二卤代-4-邻苯二甲酸二钠; 和(c)使所述二卤代二钠和/或二钠邻苯二甲酸二钠与4-卤代邻苯二甲酸酐反应,其中“卤素”选自溴 - ,氯 - 和氟 - ,在 合适的溶剂和相转移催化剂,得到4,4'-氧代双邻苯二甲酸二酐。