1: 80 percent sodium hydride in mineral oil / 3 h / 120 °C 2: 2 M H2SO4 / acetic acid / 24 h / 90 °C 3: 42 percent / sodium, deuterium oxide / dioxane / 72 h / Ambient temperature 4: 1.) hydrogen, glacial acetic acid, 2.) ammonium hydroxide / 1.) palladium black / 1.) 1 atm, 24 h, 2.) methanol, 2 h View Scheme