(C 6 H 5 CO) 2 O + C 6 H 5 ONA  C 6 H 5 COOC 6 H 5 + C 6 H 5 COONA...

2. (C 6 H 5 CO) 2 O + C 6 H 5 ONa  C 6 H 5 COOC 6 H 5 + C 6 H 5 COONa

to

ắắ đ C 6 H 5 COONa + C 6 H 5 ONa + H 2 O