1: 0.20 g / NH2OH*HCl/pyridine / 3.5 h / Heating 2: 0.24 g / sodium metal / ethanol / 4 h / Heating 3: pyridine / 3 h / Ambient temperature 4: 0.095 g / formic acid / 3 h / Heating 5: 0.068 g / p-cymene/30percent Pd-C / 2.5 h / Heating View Scheme

1: 0.63 g / formamide/(NH4)2SO4 / formic acid / 9.5 h / 160 - 170 °C 2: 0.023 g / formic acid / 3 h / Heating View Scheme

ammonium sulfate in formic acid T=160 - 170°C; 9.5 h;

ammonium sulfate; formamide in formic acid T=160 - 170°C; 9.5 h;