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    • 6. 发明授权
    • Process for the preparation of indoles
    • 吲哚的制备方法
    • US4727161A
    • 1988-02-23
    • US798919
    • 1985-11-15
    • Atsuyoshi YamauchiSeiya IguchiYuzo OnoHiroshii KimuraSatoshi Morita
    • Atsuyoshi YamauchiSeiya IguchiYuzo OnoHiroshii KimuraSatoshi Morita
    • C07D209/04C07D209/08C07C85/26C07D209/12
    • C07D209/08
    • A process for producing an indole which comprises reacting an aniline and a diol in the presence of a catalyst to produce a reaction mixture containing the indole, unreacted aniline and by-products, condensing the reaction mixture to obtain a liquid reaction product, recovering the unreacted aniline from the liquid reaction product, reducing the contents of specified by-products in the recovered aniline below specified levels and reutilizing the resulting recovered aniline. To reduce the contents of the specified by-products in the recovered aniline below specified levels, it is preferred to subject the liquid reaction product or an aniline fraction separated therefrom to a heat-treatment and then to distillation. In the above manner, the recovered aniline can be reutilized in the reaction without causing the activity of the catalyst to deteriorate.
    • 一种制备吲哚的方法,其包括在催化剂存在下使苯胺和二醇反应以产生含有吲哚,未反应的苯胺和副产物的反应混合物,将反应混合物冷凝以获得液体反应产物,回收未反应的 苯胺从液体反应产物中降低回收苯胺中指定副产物的含量低于指定水平,并再循环回收苯胺。 为了将回收苯胺中指定的副产物的含量降低到指定水平以下,优选使液体反应产物或与其分离的苯胺级分进行热处理,然后进行蒸馏。 以上述方式,回收的苯胺可以在反应中重新利用,而不会导致催化剂的活性劣化。