1: 93 percent / 1.75 h / Heating 2: 72 percent / saturated ethanolic ammonia / 1.) room temperature, 3 h, 2.) reflux, 2.5 h; 3: 22 percent / anhydrous potassium carbonate / 4.5 h / Heating View Scheme

1: 68 percent / NaHCO3, Na2S2O4 / H2O / 1.5 h / Ambient temperature 2: 93 percent / 1.75 h / Heating 3: 72 percent / saturated ethanolic ammonia / 1.) room temperature, 3 h, 2.) reflux, 2.5 h; 4: 22 percent / anhydrous potassium carbonate / 4.5 h / Heating View Scheme

1: 72 percent / saturated ethanolic ammonia / 1.) room temperature, 3 h, 2.) reflux, 2.5 h; 2: 22 percent / anhydrous potassium carbonate / 4.5 h / Heating View Scheme

potassium carbonate 4.5 h; Heating;

potassium carbonate 4.5 h; Heating;

methanol; diethyl ether

sodium hydroxide; sodium carbonate