活泼亚甲基具有酸性pKa=9~14 R一c-CHc-RR—c-cHc-ORRo-c-cH2c-0R pka≈9 pKa≈11 pka≈14 RO H rganIc C emIstryR C CH2 C R O O R C CH2 C OR O O RO C CH2 C OR O O C O C H H C O RO C O C H C O 活泼亚甲基具有酸性pKa = 9~14 pKa ≈9 pKa ≈11 pKa ≈14