CH2-CHCHO ROH-CH2-CHCH OR 干HCI OR H2/Ni CHsCH2CHOR 2o OR CH3CH2CHO 稀，冷KMnO4 CH2-CHCH< OR H2O OH →CH2-CHCHO OH OH OR H+ OH OH CH2 CHCHO 干HCl ROH CH2 CHCH OR OR CH3CH2CH CH3CH2CHO CH2 CHCH H2O H+ H2 / Ni 稀，冷KMnO4 OH- OR OR OR OR OH OH H2O H+ CH2 CHCHO OH OH