sulfuric acid 2 h; Heating;

1: 98 percent / dimethylformamide 2: 90 percent / 30percent H2SO4 View Scheme

1: 95 percent / Thionyl chloride / H2O; 1,2-dichloro-ethane / 2 h / Heating 2: 98 percent / dimethylformamide; H2O / 72 h / 25 - 30 °C 3: 90 percent / 30percent H2SO4 / 2 h / Heating View Scheme

1: 99 percent / methanol; H2O / 1 h / Heating 2: 95 percent / Thionyl chloride / H2O; 1,2-dichloro-ethane / 2 h / Heating 3: 98 percent / dimethylformamide; H2O / 72 h / 25 - 30 °C 4: 90 percent / 30percent H2SO4 / 2 h / Heating View Scheme

boron trifluoride diethyl etherate 24 h; Heating;