例如：
5.5.2 亲电加成反应
亲电试剂——具有亲电性能的试剂。 亲电加成反应——由亲电试剂作用而引起的反应。
（1）与卤化氢的加成
RCH=CHR’ + HX RCH2-CHXR’
亲电试剂
卤烷
X=Cl,Br,I
卤化氢对双键加成的活性次序一般为: HIHBrHCl
亲电加成反应历程：
碳 正 离 子
第一步是决定反应速度的步骤
第五章
烯烃
主要内容
❖ 烯烃的构造异构,命名,烯基 ❖ 烯烃的结构 ❖ 顺反异构、E-Z标记法—次序规则 ❖ 烯烃的来源和制法
❖ 烯烃的物理性质
❖ 烯烃的化学性质、亲电加成反应历程
不饱和烃(unsaturated hydrocarbons)
含有碳碳双键或碳碳叁键的脂肪族碳氢化 合物称为不饱和脂肪烃，简称不饱和烃。
引发剂——自由基链反应引发剂，如过氧化物
乙丙橡胶
共聚反应
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