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在芳烃亲电取代反应中,取代基的定位效应是有机化学工作者普遍关心的问题。从本世纪初就开始研究苯环上取代基对芳烃亲电取代反应定位效应的影响,根据反应中取代产物的
In the aromatic electrophilic substitution reaction, the positioning effect of substituents is a common concern of organic chemists. From the beginning of this century began to study the benzene ring substituent on the aromatic electrophilic substitution reaction positioning effect, according to the reaction of the substitution product