为什么硝基在苯上的亲核取代中是一个较好的离去基团，但是取代掉硝基的反应却很�见？ 知乎 Sketch Coloring Page

为什么硝基在苯上的亲核取代中是一个较好的离去基团，但是取代掉硝基的反应却很�见？ 知乎 Template

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