1、E2反应 ●E2反应中卤代烃的相对反应活性 30>20>10 3 CH3 CH3CH2 CCH3 CHrCH,CHCH 3 CH3CH2 CH, CH2 Br Br Br CH3 CH2 CH=CCH CH2CH=CHCH CH2CH,CHCH 3 3 nree two one alkyl substituents alkyl subs tituents alkyl substituents1、E2反应 E2反应中卤代烃的相对反应活性 —— 3 0 > 20 > 10 CH3 CH2 CCH3 CH3 CH2 CHCH3 CH3 CH2 CH2 CH2 Br B r B r C H3 CH3 CH=CCH3 CH3 CH=CHCH3 CH3 CH2 CH=CH2 C H3 3 0 2 0 1 0 three alkyl substituents two alkyl substituents one alkyl substituents