1: 71 percent / hydrogen peroxide, aq. potassium carbonate / dioxane / 1 h 2: 1.) methanolic ammonia, 2.) toluene-p-sulphonic acid / 1.) 6 h, room temperature 3: 83 percent / H2 / palladium-charcoal / ethanol / 3 h 4: 69 percent / sodium methoxide / methanol / 2 h / Heating View Scheme

1: 71 percent / hydrogen peroxide, aq. potassium carbonate / dioxane / 1 h 2: 1.) methanolic ammonia, 2.) toluene-p-sulphonic acid / 1.) 6 h, room temperature 3: 83 percent / H2 / palladium-charcoal / ethanol / 3 h View Scheme