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    • 7. 发明授权
    • Process for preparing 2,5-dichlorophenylthioglycollic acid
    • 制备2,5-二氯苯硫基乙醇酸的方法
    • US4918221A
    • 1990-04-17
    • US186638
    • 1988-04-27
    • Wolfgang BauerWilli Steckelberg
    • Wolfgang BauerWilli Steckelberg
    • B01J27/055B01J21/08B01J21/18C07B61/00C07C67/00C07C313/00C07C319/14C07C323/22C07C323/52C07C335/36C09B7/00
    • C07C323/00
    • A valuable starting material for the manufacture of tetrachlorothioindigo pigments is 2,5-dichlorophenylthioglycollic acid which is prepared by:(a) diazotizing 2,5-dichloroaniline with aqueous alkali metal nitrite at acidic pH to produce 2,5-dichlorophenyl-diazonium salt,(b) reacting the 2,5-dichlorophenyl-diazonium salt from (a) with thiourea in an aqueous medium at acidic pH in the presence of a catalyst to produce 2,5-dichlorophenyl-isothiuronium salt of the formula ##STR1## wherein X.sup..crclbar. is an anion of a mineral acid, (c) hydroloyzing the 2,5-dichlorophenylisothiuronium salt from (b), without intermediate isolation, at alkaline pH to produce 2,5-dichlorothiophenol and(d) condensing the 2,5-dichlorothiophenol with monochloroacetic acid to produce 2,5-dichlorophenylthioglycollic acid.
    • 用于制造四氯硫靛素颜料的有价值的起始原料是2,5-二氯苯硫乙醇酸,其通过以下制备:(a)在酸性pH下用碱金属亚硝酸盐水溶液重氮化2,5-二氯苯胺,得到2,5-二氯苯基重氮盐, (b)在酸性pH下,在催化剂存在下,使来自(a)的2,5-二氯苯基重氮盐与硫脲在水性介质中反应,得到下式的2,5-二氯苯基 - 异硫脲鎓盐,其中X ( - )是无机酸的阴离子,(c)在碱性pH下不经中间体分离从(b)中氢化2,5-二氯苯基异硫脲鎓盐,得到2,5-二氯苯硫酚,和(d)冷凝2.5 - 二氯苯硫酚与一氯乙酸反应生成2,5-二氯苯硫基乙醇酸。