1: NaOH/H2O / 1) EtOH, H2O, reflux, 12 h; 2) NaOH, reflux, 12 h; 3) HCl 1:1 2: 88 percent / ethyl polyphosphate / 1 h / 30 °C View Scheme

sodium hydroxide; water 1) EtOH, H2O, reflux, 12 h; 2) NaOH, reflux, 12 h; 3) HCl 1:1; Yield given. Multistep reaction;