R-CH-C-Y H u 穹∞-氢的酸性 CH3-C-CI CH3C-H CH3C--CH p Ka ~16 17 20 CH3COCH3 CH3C-NH, CH3-CH 26 ~30 ~50Organic Chemistry Organic Chemistry Xiamen Xiamen University University O R C H Y H C Nu α -氢的酸性 C H 3 C O Cl C H 3 C O H C H 3 C O CH 3 C H 3 C O OCH 3 C H 3 C O NH 2 C H 3 C H 3 p K a ~16 ~17 ~2 0 ~26 ~30 ~5 0