phosphorus; bromine T=85 - 90°C;

1: 83.7 percent / red phosphorous, Br2 / 85 - 90 °C 2: 1.) EtONa / 1.) EtOH, 50 deg C, 1 h, 2.) EtOH, 30 deg C, 6 h 3: 1.) D2O, NaOD, 2.) D2SO4 / 1.) reflux, 6 h, 2.) reflux, 4.5 h 4: 90.8 percent / LiAlD4 / diethyl ether / 8 h / Heating 5: 85.1 percent / red phosphorous, Br2 / 85 - 90 °C View Scheme