3.形成酸酐 PrO 205 F3CCO,H (F3 CCO)2O 74 H3PO4 g 2 C6HS CO2H +(CH3 CO)2O (C6Hs CO)20+ 2 CH3 CO2HOrganic Chemistry Organic Chemistry Xiamen Xiamen University University 3 . 形成酸酐 F 3 CCO 2 H (F 3 CCO ) 2 O P 2 O 5 74% 2 C 6 H 5CO 2 H (C H 3CO) 2 O 2 CH 3CO 2 H + H 3PO 4 (C 6 H 5CO ) 2 O +