COOH OH H3C-C-C2H5 H3C-C-C2H5 pH13,60°C KMnO4 79 COOH COOH CH3 CH 3 COOH OH OH KMnO4 KMnO4 CH2 CH2CH3 COOH COOH79% C COOH H3 C C2 H5 COOH pH13, 60℃ KMnO4 C OH H3 C C2 H5 COOH CH3 CH2 CH2 CH3 KMnO4 OH CH3 COOH KMnO4 OH COOH COOH