H 成H-C三CH CSCEC CH2 CH2CI (2)亲电性加成 Electrophilic Addition(X2HN,H2) 1)加卤素 B Br br H-C=C—H C=C HC-CH Br2 BI 2 H Br 反式加成 2)加卤化氢 BrCH3—CH=CH CH3C=CH2 CH3-C≡C—H Br HBr Br CH?CH= Ch CH3 CH= CHBr合成 H C C H C H CH3 C H CH2CH2CH3 (2) 亲电性加成 Electrophilic Addition.(X2 , HX, H2 ) 1) 加卤素: H C C H C H Br C H Br Br 2 Br 2 HC CH Br Br Br Br 反式加成 2) 加卤化氢: CH3 C C H HBr [ CH3C CH2 + Br - Br - CH3CH CH + CH3 CH Br CH2 CH3CH CHBr