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    • 13. 发明授权
    • Process for preparing 4-fluoro-3-trifluoromethylphenol
    • 制备4-氟-3-三氟甲基苯酚的方法
    • US5892126A
    • 1999-04-06
    • US969692
    • 1997-11-13
    • Katsumasa HaradaAkio MatsushitaYasuhiro Kawachi
    • Katsumasa HaradaAkio MatsushitaYasuhiro Kawachi
    • C07C39/26C07C39/24
    • C07C39/26
    • Disclosed is a process for preparing 4-fluoro-3-trifluoromethylphenol from 4-fluoro-3-trifluoromethylaniline, which comprises the steps of (1) using about 1 to 20 parts by weight of water based on 1 part by weight of 4-fluoro-3-trifluoromethylaniline in the presence of sulfuric acid to obtain 4-fluoro-3-trifluoromethylaniline sulfate; (2) subjecting the obtained 4-fluoro-3-trifluoromethylaniline sulfate to a diazotization reaction by using a diazotizing agent to obtain an aqueous solution containing about 8 to 25% by weight of a 4-fluoro-3-trifluoromethylbenzene-diazonium salt where a sulfuric acid concentration after diazotization is about 30 to 70% by weight in terms of the amount of sulfuric acid added, and the amount of water used is about 1 to 20 parts by weight based on 1 part by weight of 4-fluoro-3-trifluoromethylaniline; and (3) hydrolyzing the obtained 4-fluoro-3-trifluoromethylbenzenediazonium salt where a sulfuric acid concentration is about 30 to 70% by weight in terms of the amount of sulfuric acid added in a copper sulfate aqueous solution.
    • 公开了从4-氟-3-三氟甲基苯胺制备4-氟-3-三氟甲基苯酚的方法,其包括以下步骤:(1)使用约1至20重量份的水,基于1重量份的4-氟 -3-三氟甲基苯胺在硫酸存在下反应,得到4-氟-3-三氟甲基苯胺硫酸盐; (2)通过使用重氮化试剂使得到的4-氟-3-三氟甲基苯胺硫酸盐进行重氮化反应,得到含有约8-25重量%的4-氟-3-三氟甲基苯 - 重氮盐的水溶液,其中 重氮化后的硫酸浓度以加入的硫酸的量计为约30〜70重量%,相对于1重量份的4-氟-3-甲基丙烯酸,使用的水的量为约1〜20重量份, 三氟甲基苯胺; 和(3)水解所得到的硫酸浓度为硫酸铜水溶液中加入的硫酸的量的约30〜70重量%的4-氟-3-三氟甲基苯二氮鎓盐。