二、E2 Reaction 影响E2反应区域选择性的因素: 3) Structure of the substrates(底物的结构 CH. CH CH3 CH2=CHCH2CHCHCH3 HO- CH2=CHCH-CHCHCH3+CH2=CHCH2CH=CCH> major product minor product CI CH3 CH CH HO 一cH2 CHCHCH3 CHECHCHCH CH2CH=CCH3 Br major product minor product 当可以形成稳定的共轭烯烃, 则以形成共轭烯烃为主要产物。二、E2 Reaction 影响E2反应区域选择性的因素： 3) Structure of the Substrates (底物的结构) CH2=CHCH=CHCHCH3 CH2=CHCH2CH=CCH3 HO - + Cl CH3 CH3 CH3 CH2CHCHCH3 Br CH3 HO - CH=CHCHCH3 CH3 CH2CH=CCH3 CH3 major product minor product major product minor product + CH2=CHCH2CHCHCH3 当可以形成稳定的共轭烯烃， 则以形成共轭烯烃为主要产物