1: 100 percent / PPTS / ethanol / 72 h / 55 °C 2: 92 percent / triethylamine, dimethylsulfoxide / diethyl ether / 4.5 h / Ambient temperature 3: 100 percent / 0.17 h / 600 °C 4: 88.5 percent / diethyl ether / 0.75 h / -78 °C 5: 1.) lithium diisopropylamide / 1.) tetrahydrofuran, hexane, 15 min 2.) 2 h at -78 deg C then 15 h at room temp., HMPA 6: lithium diisopropylamide / tetrahydrofuran; hexamethylphosphoric acid triamide / -78 °C 7: 90 percent / 30percent H2O2 / CH2Cl2 / 0.08 h / Ambient temperature 8: 83 percent / sodium methoxide / methanol / Ambient temperature View Scheme

pyridinium p-toluenesulfonate in ethanol T=55°C; 72 h;

1: 100 percent / PPTS / ethanol / 72 h / 55 °C 2: 92 percent / triethylamine, dimethylsulfoxide / diethyl ether / 4.5 h / Ambient temperature 3: 100 percent / 0.17 h / 600 °C View Scheme

1: 100 percent / PPTS / ethanol / 72 h / 55 °C 2: 92 percent / triethylamine, dimethylsulfoxide / diethyl ether / 4.5 h / Ambient temperature 3: 100 percent / 0.17 h / 600 °C 4: 88.5 percent / diethyl ether / 0.75 h / -78 °C View Scheme