烯酮作酰化剂 OH R2C=C=O+R'oH R2c=c OR R,CH OR eg CH3-CH-COOC2 H5 CH2-C=O OH H2so CH3-CH-COOC2H5 OCOCH3 (98%) t--BUOH CH2=C=0-CH3COOBu-t (89%)•烯酮作酰化剂 eg: (98%) (89%) t BuOH + CH2 C O CH3 COOBu t + CH3 CH COOC2 H5 OCOCH3 H2 SO4 CH3 CH COOC2 H5 CH2 C O OH R2 CH C OR' O + R2 C C OH OR' R2 C C O R'OH