1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature 2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature 3: pyridinium dichromate / or PCC View Scheme

1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature 2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature 3: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature 4: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C 5: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating 6: 85 percent / diethyl ether / 1 h / Ambient temperature 7: 71 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating 8: 75 percent / aluminium chloride, sodium chloride / 0.08 h / 180 - 190 °C View Scheme

Multi-step reaction with 2 steps 1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature  

Multi-step reaction with 3 steps 1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature3: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature  

Multi-step reaction with 4 steps 1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature3: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature4: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C  

Multi-step reaction with 5 steps 1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature3: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature4: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C5: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating  

Multi-step reaction with 6 steps 1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature3: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature4: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C5: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating6: 85 percent / diethyl ether / 1 h / Ambient temperature  

Multi-step reaction with 7 steps 1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature3: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature4: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C5: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating6: 85 percent / diethyl ether / 1 h / Ambient temperature7: 71 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating  

With  tert.-butylhydroperoxide; bis(acetylacetonate)oxovanadium 4 h;  Ambient temperature;