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    • 4. 发明授权
    • Method of making 2-bromo-4-chloro substituted phenols
    • 制备2-溴-4-氯取代的酚的方法
    • US06417407B1
    • 2002-07-09
    • US09502082
    • 2000-02-10
    • Bao-Guo HuangLawrence B. Fertel
    • Bao-Guo HuangLawrence B. Fertel
    • C07C4563
    • C07C45/63C07C47/565
    • A 2-bromo-4-chloro substituted phenol is prepared from a first composition of a substituted phenol and benzotrifluoride in a weight ratio to the substituted phenol of about 2 to about 4. Into the first composition is sparged about 1 to about 1.5 equivalents of chlorine gas, whereby the substituted phenol is chlorinated to form a 4-chloro substituted phenol. The first composition is cooled to precipitate the 4-chloro substituted phenol, which can be isolated by filtration. A second composition is formed of the 4-chloro substituted phenol, acetic acid in an weight ratio to the 4-chloro substituted phenol of about 1 to about 2, about 1 to about 2 equivalents of a salt of a strong base and a weak acid, and about 1 to about 5 equivalents of a brominating agent, whereby the 4-chloro substituted phenol is brominated to form a 2-bromo-4-chloro substituted phenol.
    • 由与取代苯酚重量比为约2至约4的取代苯酚和三氟甲苯的第一组合物制备2-溴-4-氯取代的苯酚。向第一组合物中喷射约1至约1.5当量的 氯气,由此将取代的苯酚氯化以形成4-氯取代的苯酚。 将第一组合物冷却以沉淀4-氯取代的苯酚,其可以通过过滤分离。 第二组合物由4-氯取代的苯酚,与4-氯取代的苯酚的重量比为约1至约2,约1至约2当量的强碱和弱酸的盐形成的乙酸 和约1至约5当量的溴化剂,由此将4-氯取代的苯酚溴化以形成2-溴-4-氯取代的苯酚。