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    • 3. 发明授权
    • Preparation of substituted (dichloromethyl)pyridines
    • 取代(二氯甲基)吡啶的制备
    • US4739070A
    • 1988-04-19
    • US855226
    • 1986-04-23
    • Jon A. Orvik
    • Jon A. Orvik
    • C07D213/84C07D213/06C07D213/26C07D213/61C07D213/71C07D213/32
    • C07D213/61
    • 2- and 4-(Dichloromethyl)pyridines containing electron withdrawing substituents on the ring are prepared by the reaction of the corresponding 2- or 4-halopyridines with excess chloroform in the presence of a strong base in a medium containing a dipolar aprotic solvent or a phase transfer catalyst. 3-Chloro-5-(trifluoromethyl)-2-(dichloromethyl)pyridine, for example, is prepared by the reaction of 2,3-dichloro-5-(trifluoromethyl)pyridine with chloroform in the presence of sodium hydroxide and N-methylpyrrolidone. Substituted 2-(dichloromethyl)pyridines are useful as agricultural pesticides and as intermediates for the preparation of agricultural pesticides.
    • 通过相应的2-或4-卤代吡啶与过量的氯仿在强碱的存在下在含有偶极非质子溶剂的介质中反应制备含有吸电子取代基的2-和4-(二氯甲基)吡啶, 相转移催化剂。 例如通过2,3-二氯-5-(三氟甲基)吡啶与氯仿在氢氧化钠和N-甲基吡咯烷酮存在下反应制备3-氯-5-(三氟甲基)-2-(二氯甲基)吡啶 。 取代的2-(二氯甲基)吡啶可用作农药,作为制备农药的中间体。