1: 83 percent / Me2AlNH2 / benzene / 36 h / Heating 2: H2, conc. HCl / 5 percent Pd/C / methanol 3: 1,1-dichlorodimethyl ether / 0.5 h / 60 °C 4: 53 percent / 6 M HNO3; silver oxide / dioxane / 0.25 h / Ambient temperature View Scheme