1.1: 65 percent / H2O2 / Na2WO4*2H2O / methanol; H2O / 0.5 h / 20 °C 2.1: 94 percent / BF3 / 0.67 h / Heating 3.1: 99 percent / aq. NaOH / methanol / 4 h / Heating 4.1: 92 percent / pyridine / 0.67 h / 20 °C 5.1: n-BuLi / hexane; tetrahydrofuran / 4 h / -19 °C 5.2: 30 percent / hexane; tetrahydrofuran / 1 h / -19 °C View Scheme

1: 63 percent / Na2WO4*2H2O; aq. H2O2 / methanol; H2O 2: 85 percent / BF3 3: NaOH / Heating View Scheme

sodium tungstate; dihydrogen peroxide in methanol; water

1: 63 percent / Na2WO4*2H2O; aq. H2O2 / methanol; H2O 2: 85 percent / BF3 3: NaOH / Heating 4: pyridine View Scheme

1: 65 percent / H2O2 / Na2WO4*2H2O / methanol; H2O / 0.5 h / 20 °C 2: 94 percent / BF3 / 0.67 h / Heating 3: 99 percent / aq. NaOH / methanol / 4 h / Heating 4: 92 percent / pyridine / 0.67 h / 20 °C 5: 28 percent / Br2 / acetic acid / 5 h / 20 °C View Scheme

1.1: 61 percent / Br2 / acetic acid 2.1: 89 percent / O2 / salcomine 3.1: NaH / dimethylformamide 3.2: dimethylformamide View Scheme