NaBr H2so CH3CH2 CH2OH CH3CH2 CH2 Br KI H3PO 1)机理: a.一般烯丙型醇、苄醇、叔醇按S1机理 CH 快 C H3C-C-OH HX H3C-C-OH2 CH2 慢 CH H2C-C-OH H3C-C*+ H2O CH CH1). 机理： a. 一般烯丙型醇、苄醇、叔醇按SN1机理 H3 C C OH CH3 CH3 + HX 快 H3 C C OH2 CH3 CH2 H3 C C OH2 CH3 CH2 慢 H3 C C CH3 CH3 + H2 O KI H3 PO4 CH3 CH2 CH2 OH NaBr H2 SO4 △ CH3 CH2 CH2 Br