1: 70 percent / sodium methoxide / methanol; diethyl ether / 24 h / 20 °C 2: 73 percent / sodium acetate trihydrate / H2O; methanol / cooling 3: 62 percent / acetic acid; HCl / 2 h / Heating 4: 69 percent / hydroxylamine hydrochloride / pyridine; ethanol / 1 h / Heating View Scheme