sulfuric acid 3 h; Heating;

2: 87 percent / FeSO4*7H2O, conc. HCl / H2O; ethanol; liquid ammonia / 1 h / 80 °C 3: 97 percent / 2 N NaOH / ethanol; H2O / 1) 80 deg C, 4 h, 2) 2 h, reflux 4: 78 percent / 100percent H2SO4 / 3 h / Heating View Scheme

1: 44 percent / 96percent HNO3 / 16 h / 20 °C 3: 87 percent / FeSO4*7H2O, conc. HCl / H2O; ethanol; liquid ammonia / 1 h / 80 °C 4: 97 percent / 2 N NaOH / ethanol; H2O / 1) 80 deg C, 4 h, 2) 2 h, reflux 5: 78 percent / 100percent H2SO4 / 3 h / Heating View Scheme