hydrogen bromide T=105°C; 5 h;

hydrogen bromide T=120°C; 3 h;

1: 98 percent / LiAlH4 / tetrahydrofuran / 2 h / Heating 2: 81 percent / 48percent aq. HBr / 3 h / 120 °C View Scheme

1: 24 percent / polyphosphoric acid / 0.17 h / 145 °C 2: 98 percent / LiAlH4 / tetrahydrofuran / 2 h / Heating 3: 81 percent / 48percent aq. HBr / 3 h / 120 °C View Scheme

1: 91 percent / Et3N / tetrahydrofuran / 24 h / Ambient temperature 2: 24 percent / polyphosphoric acid / 0.17 h / 145 °C 3: 98 percent / LiAlH4 / tetrahydrofuran / 2 h / Heating 4: 81 percent / 48percent aq. HBr / 3 h / 120 °C View Scheme