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公开(公告)号:US06184384B2
公开(公告)日:2001-02-06
申请号:US09354279
申请日:1999-07-15
IPC分类号: C07D21361
CPC分类号: C07D213/61
摘要: Described are preferred processes for preparing 3,5-dichloropyridines by dechlorinating higher-chlorinated pyridine compounds such as 2,3,5,6-tetrachloropyridine in an acidic medium in the presence of zinc and optionally a quaternary ammonium catalyst.
摘要翻译: 描述的是在锌和任选的季铵催化剂的存在下,在酸性介质中通过氯化较高氯化吡啶化合物如2,3,5,6-四氯吡啶来制备3,5-二氯吡啶的优选方法。
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公开(公告)号:US06051714A
公开(公告)日:2000-04-18
申请号:US267004
申请日:1999-03-12
IPC分类号: C07D213/61 , C07D213/06
CPC分类号: C07D213/61
摘要: Described are preferred processes for dechlorinating chlorinated pyridine compounds in the presence of zinc, an alkaline reagent and a phase transfer catalyst. Particularly preferred processes provide advantageous synthetic routes to 2,3,5-trichloropyridine starting with 2,3,5,6-tetrachloropyridine.
摘要翻译: 描述了在锌,碱性试剂和相转移催化剂存在下氯化吡啶化合物脱氯的优选方法。 特别优选的方法提供从2,3,5,6-四氯吡啶开始的2,3,5-三氯吡啶的有利合成路线。
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