1: 100 percent / tosyl chloride (TsCl) / pyridine / 13 h / Heating; other dehydrating agent 2: 65 percent / H2 / 10percent Pd/C / ethanol / 24 h / 25 °C / 760 Torr 3: 97 percent / CH3SO2Cl / pyridine / 6 h / Heating View Scheme

p-toluenesulfonyl chloride in pyridine 13 h; Heatingother dehydrating agent;