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    • 2. 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。
    • 5. 发明授权
    • Process for nitrating aromatic amines
    • 硝化芳香胺的方法
    • US5922913A
    • 1999-07-13
    • US187949
    • 1998-11-06
    • Lowell J. LawrenceStefan KwiatkowskiPaul D. Smith
    • Lowell J. LawrenceStefan KwiatkowskiPaul D. Smith
    • C07C209/76C07C209/00
    • C07C209/76
    • Disclosed is a process of nitrating or dinitrating an aromatic amine compound that involves reacting the aromatic amine and nitric acid in the presence of acetic acid such that the molar ratio of the aromatic amine compound to acetic acid is from about 1:2 to about 1:16, and the molar ratio of nitric acid to the aromatic amine is between about 1.0 to about 1.5 times the nitric acid needed to complete the reaction. More particularly, the invention is a process of forming Pendimethalin, N-(1-ethylpropyl)-2,6-dinitro-3,4-xylidine, from N-(1-ethylpropyl)-3,4-xylidine (4-NAX) that involves reacting 4-NAX and nitric acid in the presence of acetic acid such that the molar ratio of nitric to the 4-NAX is between about 2:1 and about 3:1, preferably between about 2:1 and about 2.6:1, and such that the molar ratio of 4-NAX to acetic acid is between about 1:2 to about 1:16, preferably between about 1:4 and about 1:8.
    • 公开了一种芳族胺化合物的硝化或二硝化方法,其包括在乙酸存在下使芳族胺和硝酸反应,使得芳族胺化合物与乙酸的摩尔比为约1:2至约1:1。 16,硝酸与芳香胺的摩尔比为完成反应所需的硝酸的约1.0至约1.5倍。 更具体地说,本发明是由N-(1-乙基丙基)-3,4-二甲苯胺(4-NAX)形成二甲戊灵,N-(1-乙基丙基)-2,6-二硝基-3,4-二甲苯胺的方法 ),其包括在乙酸存在下使4-NAX和硝酸反应,使得硝酸与4-NAX的摩尔比为约2:1至约3:1,优选约2:1至约2.6:1。 1,使得4-NAX与乙酸的摩尔比为约1:2至约1:16,优选约1:4至约1:8。