12.2A Allylic chlorination (烯丙基氯化) ( High temperature) 400° high temp H2C=CHCH3 CI H,C=CHCH2Cl HCl (substitution reaction) 3-Chloropropene (allyl chloride) This is a free radical substitution reaction12.2A Allylic chlorination （烯丙基氯化） （High temperature) H2C CHCH3 + Cl 2 (substitution reaction) H2C CHCH2Cl 400 high temp o + HCl 3-Chloropropene (allyl chloride) This is a free radical substitution reaction