B,Na,液NH3一生成反式烯烃 H CH3 CH3-C≡C-CH3 C=C NH3(liquid) CH3 trans 反泫机理 液氨条件下的供电子 还原产生反式烯烃 Na+NHa→>Na++e CH3 CH3-C=C-CH3+e→C=C CH3 CH3 CH3 CH3 C=C C=C C=C CH3 H CH3 CH3B, Na，液NH3—生成反式烯烃 trans H H CH3 CH3 CH3 - C = C - CH3 C = C Na NH3 (liquid) 液氨条件下的供电子 还原产生反式烯烃 Na + NH3 Na+ + e CH3 - C = C - CH3 + e C = C CH3 CH3 . H - NH2 CH3 C = C H CH3 . e H CH3 C = C CH3 H - NH2 C = C CH3 CH3 H H 反应机理 :