ammonium hydroxide; hydrogen; palladium on activated charcoal in ethylene glycol dimethyl ether 3 h; Ambient temperatureParr hydrogenation apparatus;

1: 58 percent / 28-30 percent ammonium hydroxide, H2 / 10 percent Pd/C / 1,2-dimethoxy-ethane / 3 h / Ambient temperature; Parr hydrogenation apparatus 2: 92 percent / SnCl2 / 1 h / 60 °C View Scheme