ammonium chloride; sodium methylate in methanol; ethanol

1: sodium methoxide / methanol / 4 h / Heating 2: dioxane / 1 h / Heating 3: 74 percent / DMF / 4 h / Heating 4: 96 percent / N2O3 / acetic acid / 1 h / 15 °C 5: 55 percent / 1,2-dimethoxy-ethane / 1 h / Heating 6: 75 percent / 15percent H2SO4 / 6 h / Heating View Scheme

sodium methylate in methanol 4 h; Heating;