发明公开
EP0544267A1 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。
- 专利标题： Selective gas phase chlorination of polychlorinated beta-picolines to produce 2,3,5,6-tetrachloropyridine and its precursors
- 专利标题（中）： 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。
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申请号： EP92120117.4申请日： 1992-11-25
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公开(公告)号： EP0544267A1公开(公告)日： 1993-06-02
- 发明人: Allphin, Clark P. , DesJardin, Michael A. , Harley, Arnold D.
- 申请人： DowElanco
- 申请人地址： 9002 Purdue Road Indianapolis, Indiana 46268-1189 US
- 专利权人： DowElanco
- 当前专利权人： DowElanco
- 当前专利权人地址： 9002 Purdue Road Indianapolis, Indiana 46268-1189 US
- 代理机构： Huber, Bernhard, Dipl.-Chem.
- 优先权： US798683 19911126
- 主分类号： C07D213/61
- IPC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.
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