| IUPAC name
| Other names
|Molar mass||286.69 g/mol|
|Appearance||Colorless clear solid|
|Melting point||56 °C (133 °F; 329 K)|
|Boiling point||192 °C (378 °F; 465 K)|
|Solubility|| Reacts with alcohols, carboxylic acids|
Soluble in benzene, bromine, chloroform, carbon disulfide, diethyl ether, liq. HBr, liq. HCl, conc. sulfuric acid
|Safety data sheet||Sigma-Aldrich|
| Phosphorus tribromide|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Phosphoryl bromide is an inorganic compound, a colorless or faint orange-ish solid, which fumes in moist air. It's a phosphorus halide that has the formula POBr3.
Phosphoryl bromide is sold by various suppliers, but due to its hazards it's almost impossible to obtain. It's best to make it yourself.
- 3 PBr5 + P2O5 → 5 POBr3
- Make phosphate esters
POBr3 reacts with the moisture from air to release HBr fumes which are very corrosive and toxic. Wear proper protection when handling the compound.
Should be kept in closed air-tight containers, in a glovebox or desiccator. Schlenk flasks are good storage containers.
Phosphoryl bromide should be neutralized with a base, such as calcium hydroxide suspension outside or in a well ventilated area. Since the neutralization produces plenty of HBr fumes, this should be performed in a fumehood or outside. Sodium thiosulfate can also be used as neutralizing agent, as it neutralizes HBr and Br2 more effectively.