②反应历程亲核取代 关键:强酸条件下迫使醇生成质子化醇 CH2OHCH2=CHCH2OH3°>2°>1°<cH3OH RX N ROH=一ROH2=R+H2O SN2 RX+ H2O②反应历程: 亲核取代 关键:强酸条件下迫使醇生成质子化醇 CH2OH CH2 =CHCH2OH 3 o > 2 o > 1 o < CH3OH ROH H ROH2 R + H2O X RX + H2O X S RX N1 SN2