triethylsilane; boron trifluoride diethyl etherate in dichloromethane T=0 - 20°C; 20 h; Inert atmosphere;

1: Dess-Martin periodane / dichloromethane / 2 h / 0 °C 2: boron trifluoride diethyl etherate; triethylsilane / dichloromethane / 20 h / 0 - 20 °C / |Inert atmosphere View Scheme

1: 70 percent / diethyl ether / 12 h / Ambient temperature 2: SnCl4 / CH2Cl2 / 1.) -78 deg C, 1 h, 2.) 25 deg C, 6 h View Scheme

tin(IV) chloride in dichloromethane 1.) -78 deg C, 1 h, 2.) 25 deg C, 6 h; Yield given. Title compound not separated from byproducts;