Process for producing 5-chloro-.beta.-trifluoromethylpyridines
    1.
    发明授权
    Process for producing 5-chloro-.beta.-trifluoromethylpyridines 失效
    生产5-氯-β-三氟甲基吡啶的方法

    公开(公告)号:US4420618A

    公开(公告)日:1983-12-13

    申请号:US401744

    申请日:1982-07-26

    CPC分类号: C07D213/61

    摘要: 5,6-Dichloro-.beta.-trifluoromethylpyridine or 2,5,6-trichloro-.beta.-trifluoromethylpyridine is produced by reacting 6-chloro-.beta.-trifluoromethylpyridine or 2,6-dichloro-.beta.-trifluoromethylpyridine with chlorine gas to chlorinate the 5-position of pyridine nucleus thereof:(1) at a temperature of 100.degree. C. to 250.degree. C. and at least sufficient amount of chlorine for the reaction;(2) in the presence of the catalyst of amount of at least 40% by weight (based on the 6-chloro or/and 2,6-dichloro-.beta.-trifluoromethylpyridine), the catalyst being chlorides a metallic element selected from the group consisting of iron, tungsten, molybdenum, titanium, and antimony.

    摘要翻译: 通过6-氯-β-三氟甲基吡啶或2,6-二氯-α-三氟甲基吡啶与氯气反应生成5,6-二氯-β-三氟甲基吡啶或2,5,6-三氯-β-三氟甲基吡啶, 吡啶核的位置:(1)在100℃至250℃的温度和至少足够量的氯用于反应; (2)在催化剂存在下,至少40重量%(基于6-氯或/和2,6-二氯-β-三氟甲基吡啶),催化剂是氯化物,选自下组的金属元素 由铁,钨,钼,钛和锑组成。