1: 66 percent / H2 / 5percent Pd/C / methanol 2: 63 percent / DCC / tetrahydrofuran / 3 h / 0 - 4 °C 3: 52 percent / N2H2*H2O / ethanol / 1 h / Heating 4: 89 percent / aq. H2SO4, KBr, NaNO2 / 2 h / ice-cooling 5: (Bu)3SnH, AIBN / benzene / Heating View Scheme