”双分子亲核取代反应机理S、2 CH3Br+OH一CH3OH+Br 溴甲烷 =Rc(CHBr)c(OH H, o+it-rom[0c 0- Br fast →H0 -H+Br H 过渡态 吊骨界骨鼻号界骨品居品骨是骨品骨是 双分子亲核取代反应机理 SN2 v = k·c (CH3Br)·c (OH ) - + slow H C Br H H HO- δ+ δ- - fast + Br HO C - H H H C Br H H [ HO ] δ- δ- H 过渡态 CH3Br OH - CH3OH Br- + + 溴甲烷