CHO OI COOH CH, OI COOH 酮糖被硝酸氧化时,发生C-C键断裂,如 CH OH 2 口■口 COOH HoG一HHNO3HOc-H H-C-OH H-C-OH H-C-OH H-C-OH CH OH COOH-CHO -COOH -CH2OH -COOH [O] [O] 酮糖被硝酸氧化时，发生C-C键断裂，如 H H H OH OH HO CH2 OH C O C C C CH2 OH HNO3 H H H OH OH HO C C C COOH COOH