pyrichlor
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综述了毒死蜱及其中间体3，5，6 三氯吡啶2 酚（I）合成方法，重点介绍了吡啶氯化法生产I，分析了各种路线的利弊及工业化的前景。
Several preparation ways of chlorpyrifos and its key intermidate 3,5,6trichloro2pyridinone(I) have been summarized. Its emphasis on introduce the chlorination of pyridine to producing I.
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