Preparation of symmetrical tetrachloropyridine
    2.
    发明授权
    Preparation of symmetrical tetrachloropyridine 失效
    对称四氯吡啶的制备

    公开(公告)号:US4322538A

    公开(公告)日:1982-03-30

    申请号:US255602

    申请日:1981-04-20

    IPC分类号: C07D213/61 C07D213/02

    CPC分类号: C07D213/61

    摘要: Symmetrical tetrachloropyridine (2,3,5,6-tetrachloropyridine) is prepared by reacting pentachloropyridine with a source of iodide ions in the presence of a proton source and a solvent medium. The reaction is preferably carried out in a polar, aprotic solvent medium and heated at a temperature of from about 100.degree. C. to about 200.degree. C.

    摘要翻译: 在质子源和溶剂介质存在下,使五氯吡啶与碘离子源反应制备对称四氯吡啶(2,3,5,6-四氯吡啶)。 反应优选在极性非质子溶剂介质中进行,并在约100℃至约200℃的温度下加热。

    Process for preparing 4-bromotetrachloropyridine
    5.
    发明授权
    Process for preparing 4-bromotetrachloropyridine 失效
    制备4-溴四氯吡啶的方法

    公开(公告)号:US4321389A

    公开(公告)日:1982-03-23

    申请号:US159333

    申请日:1980-06-16

    IPC分类号: C07D213/61 C07D213/02

    CPC分类号: C07D213/61 Y02P20/582

    摘要: A process for producing 4-bromotetrachloropyridine or symmetrical tetrachloropyridine in high purity comprises the selective transhalogenation of pentachloropyridine by a bromide salt in a polar aprotic solvent at a temperature from about 100.degree. C. to about 140.degree. C. followed optionally by selective debromination by hydrogen in the presence of a noble metal catalyst and an acid acceptor to form tetrachloropyridine.

    摘要翻译: 用于生产高纯度的4-溴四氯吡啶或对称四氯吡啶的方法包括在极性非质子溶剂中,在约100℃至约140℃的温度下,用溴化物盐选择性转化五氯吡啶,然后任选地通过氢气选择性脱溴 在贵金属催化剂和酸受体的存在下形成四氯吡啶。