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    • 1. 发明授权
    • Preparation of aryl cyanamides from arylamines and cyanogen chloride
    • 从芳基胺和氯化氰制备芳基腈
    • US4791229A
    • 1988-12-13
    • US922635
    • 1986-10-24
    • Rudolf FaussHans-Jochem Riebel
    • Rudolf FaussHans-Jochem Riebel
    • C07C67/00C07C233/00C07C239/00C07C261/04C07D307/91C07C125/08C07C147/12
    • C07D307/91C07C233/00
    • A process for the preparation of an aryl cyanamide comprising reacting an arylamine of the formula ##STR1## in which Ar is aryl,R is hydrogen or alkyl, andn is 1, 2 or 3,(excepting 2-nitroaniline, 4-nitroaniline and arylamines having a nucleophilic character equal to or lower than 2-nitroaniline and 4-nitroaniline), with cyanogen chloride in 1-2 times the molar amount per mole of amino group of the arylamine initially in a homogeneous liquid phase using as reaction medium acetic acid (which is optionally diluted with water and/or a water-miscible, organic auxiliary solvent) in the presence of 1-1.5 molar equivalents of an auxiliary base for each amino group of the arylamine, there being more cyanogen chloride than equivalents of auxiliary base present in the reaction mixture at any point in time of the reaction, the pH of the reaction mixture being maintained below 7.
    • 一种制备芳基氨酰胺的方法,包括使式(I)的芳胺,其中Ar为芳基,R为氢或烷基,n为1,2或3(除2-硝基苯胺,4-硝基苯胺和 具有等于​​或低于2-硝基苯胺和4-硝基苯胺的亲核性质的芳基胺),其中氯化氰为最初在均相液相中的芳基胺的每摩尔氨基摩尔量的1-2倍,使用反应介质乙酸 (其任选地用水和/或水混溶性有机辅助溶剂稀释)在芳基胺的每个氨基的1-1.5摩尔当量辅助碱存在下,存在比辅助碱的当量更多的氯化氰 存在于反应混合物的任何反应时间点,反应混合物的pH值保持在7以下。