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    • 16. 发明授权
    • 2,5-dichlorophenylthioglycolic acid derivative and method for its
production
    • 2,5-二氯苯硫基乙酸衍生物及其制备方法
    • US5352821A
    • 1994-10-04
    • US19906
    • 1993-02-19
    • Hiroshi GodaNario KimuraNaohiro YoshikawaKatsuhiko Yoshida
    • Hiroshi GodaNario KimuraNaohiro YoshikawaKatsuhiko Yoshida
    • C07C323/66C07C323/62
    • C07C323/66
    • The present invention is directed to novel 2,5-dichlorophenylthioglycolic acid derivative, a process for their production and a process for producing the desired product 2,5-dichlorophenylthioglycolic acid derived from said novel compounds. 2,5-dichlorophenylthioglycolic acid derivative of the present invention can be obtained by reacting 2,4,5-trichlorobenzensulfonates and thioglycolic acid in the presence of base, and said desired product can be obtained by desulfonating said compound in an aqueous solution of mineral acid. Novel 4-carboxymethylthio-2,5-dichlorobenzenesulfonates of the present invention can be used advantageously as an intermediate for the production of 2,5-dichlorophenylthioglycolic acid. The use of said intermediate makes it possible to obtain the desired product in a decreased process steps with high yield. In addition, it poses no problem of environmental pollution as pointed out with conventional methods because it uses no heavy metals.
    • 本发明涉及新的2,5-二氯苯基硫代乙醇酸衍生物,其制备方法和由所述新化合物衍生的所需产物2,5-二氯苯基乙氧基乙酸的制备方法。 本发明的2,5-二氯苯硫代乙酸衍生物可以通过使2,4,5-三氯苯磺酸盐和巯基乙酸在碱存在下反应而获得,所需要的产物可通过将无机酸水溶液中的所述化合物脱磺酸 。 本发明的新型4-羧甲基硫代-2,5-二氯苯磺酸盐可以有利地用作生产2,5-二氯苯乙硫醇的中间体。 使用所述中间体使得可以以降低的工艺步骤以高产率获得所需产物。 另外,由于不使用重金属,因此常规方法指出了环境污染问题。