水解脱羧 COOC2Hs COONa R-CH NaOH (I)H+ -R-CH R-CH2COOH H2O COOC2H5 COONa (2)△-C02 R、 COOC2Hs NaOH (1)H+ R-CHCOOH R'1 COOC2H5 H2O (2)△-C02 R COOC2Hs NaOH (1)H+ COOC2H5 -COOH H20 (2)△-C02