1: H2SO4 conc.+ HNO3 conc, 1:1 / diethyl ether / 0.5 h / Ambient temperature 2: 1) sodium ethoxide / 1) RT, 15 min; 2) RT, 2 h View Scheme

sodium ethanolate 1) RT, 15 min; 2) RT, 2 h; Multistep reaction;