二、生成环状缩醛或缩酮： CH3 CH3 H 例： OH 1.CH3OH,H+ OH 2.PhCHO,H H HO 3 OH 半乳糖 OCH3 Organic ChemOrganic Chem 二、生成环状缩醛或缩酮： 例： OH H H OH H3 C C O CH3 O H H O CH3 CH3 O OH H H HO H OH OH H OH H3C C O CH3 O O H O H O O H OH H3C CH3 H3C H3C 半乳糖 1. CH3OH, H 2. PhCHO, H O O H H HO H OH OCH3 H O Ph H *