hydrogen; palladium on activated charcoal in ethanol Yield given;

1: 80percent aq. H2SO4, conc. aq. HNO3 (d = 1.5) / 0.5 h 2: H2 / 10percent Pd/C / ethanol View Scheme

1: conc. aq. NaOH, N-benzyltributylammonium bromide / 3 h / 60 °C 2: Na, NH3 3: 80percent aq. H2SO4, conc. aq. HNO3 (d = 1.5) / 0.5 h 4: H2 / 10percent Pd/C / ethanol View Scheme