sulfuric acid; hydrogen; nickel T=30°C; 48 h;

1: 91 percent / NH3 / diethyl ether / 8 h / 0 - 20 °C 2: 89 percent / POCl3 / 6 h / 135 °C 3: 92 percent / KF; 18-crown-6 / dimethylformamide / 6 h / 140 °C 4: 80 percent / H2; H2SO4 / Ni / 48 h / 30 °C View Scheme

1: 92 percent / KF; 18-crown-6 / dimethylformamide / 6 h / 140 °C 2: 80 percent / H2; H2SO4 / Ni / 48 h / 30 °C View Scheme

1: 89 percent / POCl3 / 6 h / 135 °C 2: 92 percent / KF; 18-crown-6 / dimethylformamide / 6 h / 140 °C 3: 80 percent / H2; H2SO4 / Ni / 48 h / 30 °C View Scheme

1: 65 percent / Fe; Cl2 / 24 h / 180 °C 2: 91 percent / NH3 / diethyl ether / 8 h / 0 - 20 °C 3: 89 percent / POCl3 / 6 h / 135 °C 4: 92 percent / KF; 18-crown-6 / dimethylformamide / 6 h / 140 °C 5: 80 percent / H2; H2SO4 / Ni / 48 h / 30 °C View Scheme

1: 87 percent / aq. H2SO4 / 2 h / 20 °C 2: 52 percent / LiAlH4 / diethyl ether / 2 h / Heating View Scheme

sulfuric acid T=20°C; 2 h;