1: 73 percent / conc. sulfuric acid, aq. sodium nitrite / 70 °C 2: 75 percent / conc. sulfuric acid / Heating 3: 66 percent / NO2BF4 / acetonitrile 4: 73 percent / methanolic ammonia / 12 h / Ambient temperature 5: 97 percent / H2 / 5percent Pd/C / methanol / 4 h / 2585.7 Torr 6: 77 percent / triethylamine / benzene / 4 h / Ambient temperature 7: 71 percent / conc. sulfuric acid / acetic acid / 4 h / Heating View Scheme

1: 73 percent / conc. sulfuric acid, aq. sodium nitrite / 70 °C 2: 75 percent / conc. sulfuric acid / Heating 3: 66 percent / NO2BF4 / acetonitrile 4: 73 percent / ethanol / 1 h / -78 deg C to room temperature 5: 88 percent / H2 / 5percent Pd/C / methanol / 4 h / 2585.7 Torr 6: 53 percent / pyridine / dimethylformamide / 6 h / Ambient temperature 7: 69 percent / conc. sulfuric acid / acetic acid / 9.5 h / 100 °C View Scheme