3.实例： 伯卤代烷 C2HgONa,C2HOH CH;CH2CH2Br →CH3CH=CH2+NaBr △ 仲卤代烷 CHCHCHCH C2HsONa,C2HsOH △ CH2=CHCH2CH,+CH,CH=CHCH3 H Br H 19% 81% CH3 CH; CHCHCHCH2 oa一CH,CH=cCcmcn.e-cn, C2HsONa,C2HsO △ H Br H 71% 29% 叔卤代烷3. 实例: 伯卤代烷 CH3CH2CH2Br C2H5ONa, C2H5OH CH3CH=CH2+ NaBr 仲卤代烷 CH2CHCHCH3 H Br H C2H5ONa, C2H5OH CH2 = CHCH2CH3+ CH3CH=CHCH3 叔卤代烷 CH3CHCHCH2 H Br H CH3 C2H5ONa, C2H5OH CH3 CH= C(CH3 )2+ CH3CH2C=CH2 CH3 71% 29% 19% 81%