1: 93 percent / diethyl ether / -20 °C 3: 90 percent / pyridine 4: 91 percent / potassium tert-butylate / dimethylformamide 5: 99 percent / Na2WO4, H2O2 / 70 °C 6: 95 percent / pyridinium p-toluenesulphonate / CH2Cl2 7: 1) lithium diisopropylamide / 1) THF, -78 deg C 8: 52 percent / 5percent Na-Hg, Na2HPO4 / 0 °C 9: 95 percent / 95percent ethanol / pyridinium p-toluenesulphonate / 40 °C 10: irradiation followed by thermal isomerization View Scheme

1: 93 percent / diethyl ether / -20 °C View Scheme

in diethyl ether T=-20°C;

1: 93 percent / diethyl ether / -20 °C 3: 90 percent / pyridine 4: 91 percent / potassium tert-butylate / dimethylformamide 5: 99 percent / Na2WO4, H2O2 / 70 °C 6: 95 percent / pyridinium p-toluenesulphonate / CH2Cl2 View Scheme

1: 93 percent / diethyl ether / -20 °C 3: 90 percent / pyridine 4: 91 percent / potassium tert-butylate / dimethylformamide 5: 99 percent / Na2WO4, H2O2 / 70 °C View Scheme