会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明授权
    • Process of preparing 2,2-bis(4-aminophenyl)-hexafluoropropane
    • 制备2,2-双(4-氨基苯基) - 六氟丙烷的方法
    • US4987259A
    • 1991-01-22
    • US360981
    • 1989-06-02
    • Masamichi MarutaShowzou KanedaMineo WatanabeEtsuko Katoh
    • Masamichi MarutaShowzou KanedaMineo WatanabeEtsuko Katoh
    • C07C209/46C07B61/00C07C63/331C07C67/00C07C209/00C07C209/56C07C209/62C07C211/52C07C247/24C07C265/14
    • C07C209/56C07C211/52
    • 2,2-Bis(4-aminophenyl)hexafluoropropane is prepared by the steps of (a) reacting 2,2-bis(4-carboxyphenyl)hexafluoropropane with thionyl chloride at 80.degree.-150.degree. C. in a water insoluble organic liquid in the presence of a catalyst such as dimethylformamide to obtain a solution of 2,2-bis(4-chloroformylphenyl)hexafluoropropane, (b) mixing the obtained solution with an aqueous solution of sodium azide to obtain an acid azide solution, (c) heating the organic phase of the acid azide solution to 80.degree. C. or above to cause rearrangement of the acid azide into an isocyanate, (d) hydrolyzing the isocyanate by mixing the isocyanate solution with an acid such as 40-80% sulfuric acid to form a salt of the aimed diamine as an aqueous solution mixed with an organic phase, and (e) neutralyzing the aqueous solution separated from the liquid mixture obtained at step (d) to precipitate the aimed diamine. This process is favorable for industrial practice because the main steps (a) to (d) are all reactions in organic liquids without precipitating solid intermediates.
    • 通过以下步骤制备2,2-双(4-氨基苯基)六氟丙烷:(a)在80-150℃下将2,2-双(4-羧基苯基)六氟丙烷与亚硫酰氯在水不溶性有机液体中反应 存在催化剂如二甲基甲酰胺,得到2,2-双(4-氯甲酰苯基)六氟丙烷的溶液,(b)将所得溶液与叠氮化钠水溶液混合,得到叠氮化钠溶液,(c)加热 将叠氮化钠溶液的有机相添加至80℃以上,使叠氮化物重排为异氰酸酯,(d)通过将异氰酸酯溶液与酸如40-80%硫酸混合来水解异氰酸酯,形成 作为与有机相混合的水溶液的目标二胺的盐,和(e)中和从步骤(d)获得的液体混合物分离的水溶液以沉淀目标二胺。 这个过程有利于工业实践,因为主要步骤(a)至(d)都是有机液体中的反应,而不会使固体中间体沉淀。