1: 88 percent / diisobutylaluminum hydride / toluene / 1 h / -78 °C 2: Hg(OCOCF3)2 / 120 h / Heating 3: 250 °C 4: AgNO3, KOH / ethanol / 0.5 h / 25 °C 5: stannic chloride / CH2Cl2 / -78 °C View Scheme

With  manganese(IV) oxide in  dichloromethane 4 h;  Ambient temperature;   

Multi-step reaction with 5 steps 1: 99 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / 20 h / 95 - 100 °C2: 61 percent / m-chloroperbenzoic acid / CH2Cl2 / 48 h / 25 °C4: 79 percent / hydrogen peroxide5: 86 percent / manganese dioxide / CH2Cl2  

Multi-step reaction with 2 steps 1: 79 percent / hydrogen peroxide2: 86 percent / manganese dioxide / CH2Cl2  

Multi-step reaction with 2 steps 2: 86 percent / MnO2 / CH2Cl2 / 4 h / Ambient temperature