silica gel in chloroform 5 h; Heating;

1: 85 percent / ethanol / 8 h / Ambient temperature 2: 90 percent / triethylamine / methanol / 2 h / Ambient temperature 3: 94 percent / silica gel / CHCl3 / 5 h / Heating View Scheme

1: 88 percent / SeO2 / xylene / 8 h / Heating 2: 85 percent / ethanol / 8 h / Ambient temperature 3: 90 percent / triethylamine / methanol / 2 h / Ambient temperature 4: 94 percent / silica gel / CHCl3 / 5 h / Heating View Scheme

1: 90 percent / triethylamine / methanol / 2 h / Ambient temperature 2: 94 percent / silica gel / CHCl3 / 5 h / Heating View Scheme

1: 0.45 g / PCl5 / benzene / 4 h / Heating 2: Ac2O / 3 h / Heating View Scheme

acetic anhydride 3 h; Heating;