发生消去得到查伊采夫烯烃.
R`CH2-CR2-X + R``ONa → NaX + R``OH + R`CH=CR2
伯卤代烷与醇钠反应,以亲核取代成醚为主.
仲卤代烃与醇钠反应,往往是亲核取代和消去反应同时发生.
叔卤代烃与醇钠反应,往往不能得到醚,而是消去得到烯烃.
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