Ложный эфир:
HO-C6H4-COOH + C2H5OH, H+ ---> HO-C6H4-COO-C2H5 (этилсалицилат)
простой эфир:
C2H5OH --(+HBr, -H2O)--> C2H5Br
HO-C6H4-COO-C2H5 --(NaOH, -H2O)--> NaO-C6H4-COO-C2H5 + (C2H5Br, -NaBr --->
C2H5O-C6H4-COO-C2H5 --(H2O, -C2H5OH)--> C2H5O-C6H4-COOH