CHO稀NaOH、CH2OH COONa COOH CooNa CooNa 酮酸: CHr COOh-费林试剂, CH3 COOF+co↑ 3.脱羧反应 稀H2SO4 CHrCCooH- →CH3CHO+CO2 CH.COCHCOOH_室温 CH3 COCH3 + CO2COOH CHO COONa 稀NaOH CH2 OH + COONa COONa 酮酸： CH3 CCOOH O 费林试剂 CH3 COOH + CO2 3.脱羧反应 CH3 CCOOH O 稀H2 SO4 CH3 CHO + CO2 CH3 COCH2 COOH 室温 CH3 COCH3 + CO2