1: 73 percent / POCl3 / 48 h / 115 °C 2: 94 percent / H2 / Raney-nickel / tetrahydrofuran / 21 h / 26 - 34 °C / 1241.2 - 2585.7 Torr 3: 91 percent / hexafluorophosphoric acid, aq. NaNO2 / 0.08 h 4: 27 percent / 150 °C View Scheme

1: 94 percent / H2 / Raney-nickel / tetrahydrofuran / 21 h / 26 - 34 °C / 1241.2 - 2585.7 Torr 2: 91 percent / hexafluorophosphoric acid, aq. NaNO2 / 0.08 h 3: 27 percent / 150 °C View Scheme

1: 91 percent / hexafluorophosphoric acid, aq. NaNO2 / 0.08 h 2: 27 percent / 150 °C View Scheme

sodium hydroxide in tetrahydrofuran T=5 - 20°C; 0.5 h;