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sn2反应速率怎么判断

更新时间: 2020-10-21 00:00:00     

判断sn2反应速率要根据离去基团的碱性,离去基团的碱性越强,其离去能力越弱,反之亦然。离子的碱性随着所在周期的增加而降低。对于卤素离子而言,碘离子的碱性最弱,因此碘离子是一个很好的离去基团。sn1是单分子亲核取代,决速步由一种分子控制,是一级反应,质子溶剂有利于sn1。sn2是双分子亲核取代,决速步由两种分子控制,是二级反应,偶极溶剂有利于sn2。

关键词: sn2 反应 速率 怎么 判断

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