1: 110 mg / 0.17 h / Ambient temperature 2: 500 mg / KNO3, conc. H2SO4 / 0.5 h / Ambient temperature 3: 360 mg / conc. H2SO4 / 0.5 h / 70 °C 4: 1.) NaH / 1.) DMF, RT, 30 min, 2.) DMF, RT, 1 h View Scheme

1: 110 mg / 0.17 h / Ambient temperature 2: 500 mg / KNO3, conc. H2SO4 / 0.5 h / Ambient temperature 3: 360 mg / conc. H2SO4 / 0.5 h / 70 °C 4: 1.) NaH / 1.) DMF, RT, 30 min, 2.) DMF, RT, 1 h 5: Fe, conc. aq. HCl / 0.33 h View Scheme

1: 110 mg / 0.17 h / Ambient temperature 2: 500 mg / KNO3, conc. H2SO4 / 0.5 h / Ambient temperature 3: 360 mg / conc. H2SO4 / 0.5 h / 70 °C 4: 1.) NaH / 1.) DMF, RT, 30 min, 2.) DMF, RT, 1 h 5: Fe, conc. aq. HCl / 0.33 h 6: H2O / 4 h View Scheme

1: 110 mg / 0.17 h / Ambient temperature 2: 500 mg / KNO3, conc. H2SO4 / 0.5 h / Ambient temperature 3: 360 mg / conc. H2SO4 / 0.5 h / 70 °C 4: Fe, conc. aq. HCl / 0.33 h 5: H2O / 2 h View Scheme