2.醚键的端裂： CH3 HBr 48% 2(CH3)2CH-Br H;C CHL3130-140°C 选择断 CHCHO-CHCHCHOH CH3I S、2历程 小基团背面 进攻控阻小 CH3 CH3 CHO-CH CH. +CH3OH Sv1历程 CH3 C 3正离子稳定 Organic ChemOrganic Chem 2. 醚键的端裂： 选择断裂 SN2历程 小基团背面 进攻控阻小 SN1历程 3º正离子稳定 CH O H3 C H3 C CH3 CH3 HBr 48% 130~140C 2(CH3 ) 2 CH Br CH3 CH2 O CH3 HI CH3 CH2OH CH3 + I OCH3 57%HI 130~140C OH CH3 + I CH3 C CH3 CH3 O CH3 HI CH3 C CH3 CH3 I + CH3OH O HI X