1: 50 percent aq. NaOH; cetyltrimethylammonium chloride / 18 h / 80 °C 2: 2 percent aq. HCl / methanol / 2 h / 20 °C 3: K2CO3 / methanol / 0.17 h / 20 °C 4: NaN3; 15-crown-5 / tetrahydrofuran / 12 h / 20 °C 5: Jones' reagent / acetone / 0.25 h / 0 °C 6: H2 / Pd/C / ethanol / 16 h / 20 °C View Scheme