tin(IV) chloride in dichloromethane T=-78°C;

With  potassium hydroxide; silver nitrate in  ethanol; water 0.5 h;  Ambient temperature;   

Multi-step reaction with 7 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: hydrogen peroxide5: 78 percent / Hg(OCOCF3)2 / 120 h / Heating6: 94 percent / 250 °C7: 93 percent / AgNO3, KOH / ethanol / 0.5 h / 25 °C  

Multi-step reaction with 2 steps 1: 94 percent / 250 °C2: 93 percent / AgNO3, KOH / ethanol / 0.5 h / 25 °C