hydrogen; potassium carbonate; palladium on activated charcoal in ethanol T=25°C; P=1034.3 - 2585.7 Torr; 2 h; other reducing agent;

1: 70 percent / conc. H2SO4, HNO3 (1.5 d) / 1.) 0 deg C, 2.) 25 deg C, 1 h 2: 88 percent / H2, 10percent aq. K2CO3 / 5percent Pd/C / ethanol / 2 h / 25 °C / 1034.3 - 2585.7 Torr / other reducing agent View Scheme