1.CH3CH2Cl（NaOH醇溶液加热）C2H4 2.C2H4（NaOH水溶液加热） C2H5OH 3.C2H5OH的催化氧化（Ag催化剂,加热）CH3CHO 4.羟醛缩合 2CH3CHO →NaOH催化→ CH3CH=CHCHO H2O 5.催化加氢CH3CH=CHCHO 2H2→ Ni或Pt催化加热→ CH3CH2CH2CH2OH