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苯环上到底有几种等效氢

更新时间: 2020-07-11 00:00:00     

苯环是一个闭合的共轭体系,六个碳原子的π电子云分布是一样的。但当苯环上有一个取代基时,取代基会改变苯环的电子分布,使分子极化。诱导效应和共轭效应都能产生这种分子极化。不仅使苯环的电子云密度增加或降低,而且还决定了苯环上各个位次电子云密度分布情况。

苯环上的六个氢原子都是等效氢原子。也就是说苯环上的六个氢原子等效。

关键词: 到底 等效

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