1: Dess-Martin periodane / dichloromethane / 2 h / 0 - 20 °C / Inert atmosphere 2: sodium chlorite; sodium dihydrogen phosphate dihydrate; 2-methyl-but-2-ene / water; tert-butyl alcohol / 20 °C / Inert atmosphere 3: nitromethane / 99.5 h / 50 - 65 °C / Inert atmosphere 4: palladium 10 on activated carbon; hydrogen / methanol / 24 h / 20 °C 5: trifluoroacetic acid / water / 2 h / 20 °C View Scheme