1: 87 percent / H2SO4 / 2 h / 100 °C 2: 53 percent / arsenic pentoxide; H2SO4 / 2 h / 150 °C 3: 98 percent / NH3 / ethanol / 22 h / 160 °C 4: 90 percent / H2 / Pd/C / ethanol / 3.5 h / 20 - 25 °C / 2280 Torr View Scheme

ammonia in ethanol T=160°C; Substitution; 22 h;

sulfuric acid T=100°C; Hydrolysis; 2 h;

Multi-step reaction with 2 steps 1: 87 percent / H2SO4 / 2 h / 100 °C2: 53 percent / arsenic pentoxide; H2SO4 / 2 h / 150 °C