二烯烃指含有分子中含有两个碳碳双键的有机化合物。根据两个双键位置的不同,二烯烃又可分为:
其中以共轭二烯烃最为重要。 共轭二烯烃中以1,3-丁二烯最为典型。与其它烃加成反应相比,它特殊的是能发生1,4加成和1,2加成。1,4加成较为普遍。
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