potassium hydroxide in water 72 h; Heating;

1: 86 percent / POCl3/PCl5 / 8 h / Heating 2: 62 percent / 47percent aqueous HI/red phosphorus / 4 h / 140 °C 3: 4.5 g / KOH / H2O / 72 h / Heating View Scheme

1: 95 percent / Bromine / acetic acid / 0.5 h 2: 86 percent / POCl3/PCl5 / 8 h / Heating 3: 62 percent / 47percent aqueous HI/red phosphorus / 4 h / 140 °C 4: 4.5 g / KOH / H2O / 72 h / Heating View Scheme

1: 62 percent / 47percent aqueous HI/red phosphorus / 4 h / 140 °C 2: 4.5 g / KOH / H2O / 72 h / Heating View Scheme