2)形成酸酐 羧酸失水。加热、脱水剂：醋酸酐或P2Os等。 0 R-C-OH P205 R- R-C-OH △ R-C-O+ H20 o 0 00 CH2COOH CH;COCCH3 △ COOH 0 0 00 11 CH3COONa CH3CH2CCI △ CH3COCCH2CH3 NaCI2) 形成酸酐 羧酸失水。加热、脱水剂：醋酸酐或P2O5等。 R C O OH R C O OH P2O5 R C O R C O O + H2O CH2COOH COOH CH3COCCH3 O O O O O CH3COONa + CH3CH2CCl O CH3COCCH2CH3 O O + NaCl