1: 79 percent / ammonium acetate, AcOH / benzene / 21 h / Heating 2: 2.) 6N NaOH / 1.) EtOH, reflux, 22 h, 2.) EtOH, H2O, reflux, 24 h 3: 72 percent / 6 h / Heating View Scheme

6 h; Heating;

1: 2.) 6N NaOH / 1.) EtOH, reflux, 22 h, 2.) EtOH, H2O, reflux, 24 h 2: 72 percent / 6 h / Heating View Scheme