1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 83 percent / triethylamine / tetrahydrofuran / 8 h / Ambient temperature 3: 98 percent / Br2 / CCl4 / 0 °C 4: 1.3 g / DBN / diethyl ether / 10 h / 0 °C 5: 92 percent / KF / methanol / 2 h / 0 °C 6: 92 percent / phosphate buffer / tetrahydrofuran; H2O / pH 7.0 View Scheme

1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 70 percent / dimethyl sulfoxide, trifluoroacetic anhydride / CH2Cl2 / 0.67 h / -65 °C 3: 44 percent / Br2 / CHCl3 / -65 °C 4: 2.) DBN / 1.) CCl4, 1 h, 2.) ether, room temperature, 10 h 5: 49 percent / aq. phosphate buffer / CHCl3 / 4 h / pH 6 6: 12 percent / carbonate/borate buffer / tetrahydrofuran; H2O / pH 10.0 View Scheme

1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 70 percent / dimethyl sulfoxide, trifluoroacetic anhydride / CH2Cl2 / 0.67 h / -65 °C View Scheme

tert.-butylhydroperoxide; bis(acetylacetonate)oxovanadium in benzene 3 h; Heating;

1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 70 percent / dimethyl sulfoxide, trifluoroacetic anhydride / CH2Cl2 / 0.67 h / -65 °C 3: 44 percent / Br2 / CHCl3 / -65 °C View Scheme

1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 70 percent / dimethyl sulfoxide, trifluoroacetic anhydride / CH2Cl2 / 0.67 h / -65 °C 3: 44 percent / Br2 / CHCl3 / -65 °C 4: 2.) DBN / 1.) CCl4, 1 h, 2.) ether, room temperature, 10 h View Scheme

1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 70 percent / dimethyl sulfoxide, trifluoroacetic anhydride / CH2Cl2 / 0.67 h / -65 °C 3: 44 percent / Br2 / CHCl3 / -65 °C 4: 2.) DBN / 1.) CCl4, 1 h, 2.) ether, room temperature, 10 h 5: 49 percent / aq. phosphate buffer / CHCl3 / 4 h / pH 6 View Scheme

1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 83 percent / triethylamine / tetrahydrofuran / 8 h / Ambient temperature 3: 98 percent / Br2 / CCl4 / 0 °C 4: 1.3 g / DBN / diethyl ether / 10 h / 0 °C 5: 92 percent / KF / methanol / 2 h / 0 °C View Scheme

1: 88 percent / tert-butyl hydroperoxide, VO(acac)2 / benzene / 3 h / Heating 2: 83 percent / triethylamine / tetrahydrofuran / 8 h / Ambient temperature 3: 98 percent / Br2 / CCl4 / 0 °C View Scheme