申请人:DOWELANCO
公开号:EP0306547A1
公开(公告)日:1989-03-15
2-Hydrocarbyl-3,6-dichloropyridines are prepared from dichloromethyl hydrocarbyl ketones and acrylonitrile in a two-step process involving an addition reaction under basic conditions to form intermediate 1,1-dichloro-3-cyanopropyl hydrocarbyl ketones and a subsequent cyclization reaction in the presence of hydrogen chloride. Thus, 3,6-dichloro-2-methylpyridine is prepared from 1,1-dichloro-2-propanone and acrylonitrile by the formation and further reaction of 4,4-dichloro-5-oxo-hexanenitrile. The intermediates and products are novel compounds useful in the preparation of herbicides and nitrification inhibitors.
2-烃基-3,6-二氯吡啶是由二氯甲基烃基酮和丙烯腈通过两步法制备的,包括在碱性条件下进行加成反应生成中间体 1,1-二氯-3-氰丙基烃基酮,以及随后在氯化氢存在下进行环化反应。因此,3,6-二氯-2-甲基吡啶是由 1,1-二氯-2-丙酮和丙烯腈通过 4,4-二氯-5-氧代己烯腈的生成和进一步反应制备的。这些中间体和产品是新型化合物,可用于制备除草剂和硝化抑制剂。