hydrogen; palladium on activated charcoal in methanol P=760 Torr; 22 h;

1: 80.2 percent / K2CO3 / dimethylformamide / 96 h / 20 °C 2: 77.7 percent / NaN3 / dimethylformamide / 24 h / 80 °C 3: 83 percent / H2 / Pd/C / methanol / 22 h / 760 Torr View Scheme

in various solvent(s) T=120°C; 2 h;