1: 62 percent / pyridinium p-toluenesulfonate (PPTS) / ethanol / 4 h / 55 °C 2: 55 percent / (Et2N)(Me2N)SF2 / CCl3F / 1.) -70 deg C, 45 min, 2.) RT, 1 h 3: 83 percent / potassium carbonate / methanol / 0.17 h / Ambient temperature View Scheme

pyridinium p-toluenesulfonate in ethanol T=55°C; 4 h;

pyridinium p-toluenesulfonate in ethanol T=55°C; 4 h;

1: 62 percent / pyridinium p-toluenesulfonate (PPTS) / ethanol / 4 h / 55 °C 2: 55 percent / (Et2N)(Me2N)SF2 / CCl3F / 1.) -70 deg C, 45 min, 2.) RT, 1 h View Scheme