Mechanism CH3 CH3 CH3-C-CI AICl3± CH;-C@ AICI CH; CH; t-butyl carbocation CHS产Q (CH):C. CH3- CH ⊕ resonance stabilized intermediate C户AICh (CH3);C +HCI (+AIC13) Mechanism C H3 C CH3 CH3 Cl AlCl 3 C CH3 CH3 C H3 t-butyl carbocation AlCl 4 C H3 C CH3 CH3 (CH3) 3C H (CH3 ) 3C (CH3) 3C resonance stabilized intermediate C l AlCl 3 (CH3) 3C + HC l (+ AlCl 3)