441双分子亲核取代反应(SN2) substitution, nucleophilIC bimolecular OH l C-Br HO----C----Br H HO-CWUH t Br Walden invertionOrganic Chemistry Organic Chemistry Xiamen Xiamen University University 4.4.1 双分子亲核取代反应(S N2) substitution, nucleophilic, bimolecular 4.4.1 双分子亲核取代反应(S N2) substitution, nucleophilic, bimolecular OH H C Br H H H C Br H H HO H HO C H H + Br W a l d e n in v ertio n