2.亲电加成反应( Electrophilic Addition): C=C +Y-Z Y Z Mechanism H H R A RR C-C-H R H H B RR C-C-H RR C-C-H H
2. 亲电加成反应(Electrophilic Addition) ： - C = C- + Y - Z - C - C - Y Z Mechanism: C C H H R R Y Z C C H H H R R + C C H H H R R + Z - C C H H H R R Z A: B:
(1).与HX的加成( HCL HBr,H): C=C-+ HX C-C Activity: HCl< HBr < HI CHCH=CH HI CH3 CHICH3 2-Iodopropane (isopropyl iodide CH3 CHBrCH3 CHa-CH=CH + HBr (Markovnikov rule) R-O-O-R CH CHCH Br (anti-Markovnikov rule)
- C = C - + HX - C – C - H X Activity: HCl < HBr < HI CH3CH = CH2 + HI CH3CHICH3 2-Iodopropane (isopropyl iodide) CH3 -CH=CH2 + HBr CH3CHBrCH3 R-O-O-R CH3CH2CH2Br (Markovnikov rule) (anti-Markovnikov rule) (1). 与HX的加成(HCl, HBr, HI)：