HoSO 4 HC≡CH+H2O CH?CHO HgSO4 OH OH HCN H CH3CHCN H,O RCHCOOH 例2:丙烯合成α-羟基丁酸 OH ChCh-CH-CH3CH2CHCOOHHC CH + H2 O HgSO4 H2 SO4 CH3 CHO HCN CH3 CHCN OH RCHCOOH OH H2 O H + 例2：丙烯合成α-羟基丁酸 CH3 CH2 CHCOOH OH CH3 CH=CH2