1.1: pyridinium chlorochromate / dichloromethane / 3 h / 20 °C 2.1: diphenyl diselenide; dihydrogen peroxide / dichloromethane / 24 h / 20 °C / Inert atmosphere 2.2: 16 h 3.1: diphenyl diselenide; dihydrogen peroxide / dichloromethane / 48 h / 20 °C / Inert atmosphere 3.2: 16 h 4.1: palladium 10 on activated carbon; hydrogen / ethyl acetate / 1 h / 20 °C / 760.05 Torr View Scheme