1: 92 percent / sodium dichromate, sulfuric acid / H2O; diethyl ether / 2 h / 25 °C 2: 70 percent / potassium carbonate / butan-2-ol / 5 h / Heating 3: 86 percent / H2 / Pd/C / 10 h / 25 °C / 760 Torr View Scheme