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    • 1. 发明授权
    • Method of manufacturing flumetralin
    • 氟美他啶的制备方法
    • US6137009A
    • 2000-10-24
    • US416543
    • 1999-10-12
    • Stefan KwiatkowskiSteven G. MobleyKryzsztof PupekMiroslaw GolinskiPaul D. Smith
    • Stefan KwiatkowskiSteven G. MobleyKryzsztof PupekMiroslaw GolinskiPaul D. Smith
    • C07C209/08C07C211/29C07C209/00
    • C07C209/08
    • The invention is a process to manufacture the intermediate secondary amine N-ethyl-2-chloro-6-fluoro-benzylamine, and then the process of reacting this intermediate to manufacture the herbicide flumetralin. Equimolar quantities of monoethylamine, sodium hydroxide, and 2-chloro-6-fluorobenzyl chloride are reacted at a temperature between about 70.degree. C. and about 100.degree. C. in a composition containing at least 2.5 times the required quantity of monoethylamine. The reagent monoethylamine functions as solvent and heat sink for the reaction, and also minimizes the formation of undesired byproducts. The excess monoethylamine is removed after formation of the intermediate. Then, equimolar quantities of sodium hydroxide in water and molten 4-chloro-3-5-dinitrobenzotrifluoride are added to the intermediate, and the temperature is controlled between about 90.degree. C. and about 115.degree. C. The product of this reaction is relatively pure, i.e., 98 percent by weight, molten flumetralin. It is advantageous to wash the product with boiling water to facilitate removal of salt and excess sodium hydroxide.
    • 本发明是制备中间仲胺N-乙基-2-氯-6-氟 - 苄胺的方法,然后是使该中间体反应以制备除草剂氟马特林的方法。 将等摩尔量的单乙胺,氢氧化钠和2-氯-6-氟苄基氯在约70℃至约100℃的温度下在含有至少2.5倍所需量的单乙胺的组合物中反应。 试剂单乙胺用作反应的溶剂和散热器,并且还使不期望的副产物的形成最小化。 在形成中间体之后除去过量的单乙胺。 然后,将等摩尔量的氢氧化钠水溶液和熔融的4-氯-3,5-二硝基三氟甲苯加入到中间体中,温度控制在约90℃至约115℃之间。该反应的产物相对 纯的,即98重量%的熔融氟汞。 用沸水洗涤产品以便于除去盐和过量的氢氧化钠是有利的。