卤素参与 苯基参与 赤式3-碘-2-氯丁烷 CH; OTs C*=C14 OSol SolQ Sol-OH Sol-OH=HCOOH H+HC CH3 H3C Ph CH3COOH (士)苏式 Organic Chem Organic Chem 卤素参与 苯基参与 赤式3-碘-2-氯丁烷 (±)-苏式 C C OH I CH3 H H3C H C C OH2 I CH3 H H3C H HCl -H2O C C I H CH3 H3C H Cl - a b a b C C Cl I CH3 H H3C H C C H H I H3C Cl CH3 H OTs H3C CH3 H  H H3C CH3 H  + OTs - Sol-OH H OSol H3C CH3 H  + C C Ph SolO H H H3C CH3  C* = C 14 Sol-OH=HCOOH CH3COOH