1: 96.1 percent / 30 percent H2O2 / CH2Cl2 / 0.5 h 2: 86 percent / DIBAL / toluene; tetrahydrofuran / 1 h / Ambient temperature 3: 89 percent / BF3*OEt2 / CH2Cl2 / 0.5 h / Ambient temperature 4: H2 / PtO2 / ethyl acetate / 2.5 h / 2068.6 Torr / Ambient temperature 5: 439.1 mg / Jones reagent / diethyl ether View Scheme

Multi-step reaction with 2 steps 1: 96.1 percent / 30 percent H2O2 / CH2Cl2 / 0.5 h2: 86 percent / DIBAL / toluene; tetrahydrofuran / 1 h / Ambient temperature  

With  dihydrogen peroxide in  dichloromethane 0.5 h;