Electrophilic substitution* General mechanism ·Halogenation*(卤代反应) Sirp Atack on the elecophite foems the sigm complex. ·Nitration*(硝化反应) HH ·Sulfonation*(磺化反应) ·Friedel--crafts reaction(傅-克反应) HH General mechanism Energy diagram 吸热 +Y-Z [的 mg作ftm Halogenation* Mechanism of halogenation -+RC→0-处-eC FeCl or Fe +C HCI 55-60℃ - % FeBr;or Fe + +Br2- +HBr △ HB" 44 Prepared by Yang R. L. Electrophilic substitution* • Halogenation* (卤代反应 ) • Nitration* (硝化反应 ) • Sulfonation* (磺化反应 ) • Friedel-crafts reaction (傅-克反应 ) Prepared by Yang R. L. General mechanism Prepared by Yang R. L. H H H H B H H E [ ] ´ General mechanism Prepared by Yang R. L. Potential-energy diagram describing the course of the reaction of bezene with an eletrophile 吸热 Energy diagram Prepared by Yang R. L. Cl Cl2 55~60。C + FeCl3 or Fe + HCl Br Br + 2 FeBr3 or Fe + HBr Halogenation* Prepared by Yang R. L. Mechanism of halogenation