Selective gas phase chlorination of polychlorinated beta-picolines to produce 2,3,5,6-tetrachloropyridine and its precursors
    2.
    发明公开
    Selective gas phase chlorination of polychlorinated beta-picolines to produce 2,3,5,6-tetrachloropyridine and its precursors 失效
    多氯代甲基吡啶的β选择性气相氯化制备2,3,5,6-四氯吡啶和它的前体。

    公开(公告)号:EP0544267A1

    公开(公告)日:1993-06-02

    申请号:EP92120117.4

    申请日:1992-11-25

    申请人: DowElanco

    IPC分类号: C07D213/61

    CPC分类号: C07D213/61

    摘要: 2,3,5,6-Tetrachloropyridine, and 2,3,6-tricholoro-5-(trichloromethyl)pyridine are prepared by selectively chlorinating polychlorinated β-picolines in the vapor phase between 250°C and 450°C in the presence of specific Lewis acid halide catalysts on an inorganic support. The gamma-position on the pyridine ring is usually not chlorinated in the starting material or reaction products. These compounds are useful intermediates to produce insecticides and herbicides.

    摘要翻译: 2,3,5,6-四氯,和2,3,6- tricholoro -5-(三氯甲基)吡啶是通过在存在选择性氯化聚氯测试-picolines在250℃和450℃之间的气相制备 到无机载体特定的路易斯酸卤化物催化剂。 在吡啶环上的伽马位置在原料或反应产物是氯化一般不。 这些化合物是有用的中间体,以产生杀虫剂和除草剂。