Enamine(烯胺) BrCH, cO,CH CH, CO, CH H/H2O H2CO C2H5 75% O O RCOCI H/HO R R Question O H+ A BrCH2CO, CH5-B H/HO CH3 CH2 CCH2 CH3 CH3 CH2 CCHCCH3 CHEnamine (烯胺) N + N CH2CO2C2H5 H+ B /H2O rCH2CO2C2H5 CH2CO2C2H5 O 75% + BrCH2CO2C2H5 H+/H2O O N H H+ A B C Question: CH3CH2CCH2CH3 O CH3CH2CCHCCH3 CH3 O O N O RCOCl N O C R O H+/H2O C R O O