申请人:Occidental Chemical Corporation
公开号:US04978798A1
公开(公告)日:1990-12-18
Disclosed is a method of making a bisphenyl dihalomethane by reacting a trihalomethylbenzene with a halobenzene and a Lewis acid. The bisphenyl dihalomethane can than be reacted with water to form a halobenzophenone. In an optical third step ring chlorines that are present can be replaced with fluorines and, in a final step, any remaining chlorines can be removed to leave a fluorobenzophenone. The process is particularly useful in making 4,4'-difluorobenzophenone, which is in turn useful in making polyetheretherketones.
本发明涉及一种制备双酚二卤甲烷的方法,该方法通过将三卤甲基苯与卤代苯和路易斯酸反应来实现。然后,可以将双酚二卤甲烷与水反应,形成卤代苯酮。在第三步中,可以用氟代素取代存在的环状氯元素,在最后一步中,可以去除任何剩余的氯元素,以留下氟代苯酮。该过程在制备4,4'-二氟苯酮方面特别有用,而4,4'-二氟苯酮又可用于制备聚醚醚酮。