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Phosphorus tribromide

Product name: Phosphorus tribromide
Alias: Phosphorus(III) bromide; Phosphoroustribromide; phosphorousbromide
CAS No: 7789-60-8
EINECS: 232-178-2
Molecular formula: PBr3
Relevant categories: organic and inorganic chemicals; inorganic chemical raw materials; inorganic halides; phosphorus compounds and phosphate; inorganic chemical products; inorganic salts; pharmaceutical intermediates; phosphorus compounds.

Physical properties
Appearance and properties: colorless or light yellow fuming liquid with irritating odor
Molecular weight: 270.72
Vapor pressure: 1.33kPa(47.8℃)
Melting point: -41.5℃
Boiling point: 173.2℃
Density: relative density (water=1)2.85
Stability: stable
Solubility: soluble in acetone, carbon disulfide, trichloromethane and carbon tetrachloride
Chemical properties
Phosphorus tribromide reacts with water and generates hydrogen bromide and phosphorous acid.
PBr3 + 3H2O → H3PO3 + 3HBr
Phosphorus tribromide can be used as lewis acid and lewis base.
Three bromine atoms in PBr3 can be brominated: PBr3 + 3ROH → 3RBr + HP(O)(OH)2
Phosphorus tribromide reacts with carboxylic acid and generates acylbromide:
PBr3 + 3RCOOH → 3RCOBr + HP(O)(OH)2
Phosphorus tribromide can be used as catalyst for carboxylic acid α bromination reaction.
Phosphorus tribromide is strong reducing agent. The reaction with oxygen is more intense than phosphorus trichloride, then generates P2O5 and Br2.
Toxicological information and environmental behavior:
Hazardous characteristics: turns hot, fuming and even explosive in contact with water. Corrosive.
Reaction formula with water: PBr3 + 3H2O → H3PO3 + 3HBr
Combustion (decomposition) products: hydrogen bromide, phosphorus oxide and phosphorane.
Computational chemistry data
1. XlogP: 2.8
2. Number of hydrogen bond donors: 0
3. Number of hydrogen bond acceptors: 0
4. Number of rotatable chemical bonds: 0
5. Number of tautomers: none
6. Polar topological molecular surface area (TPSA): 0
7. Heavy atom number: 4
8. Surface charge: 0
9. Complexity: 8
10. Number of isotopic atoms: 0
11. Stereochemical center number of of certain atom: 0
12. Stereochemical center number of of uncertain atom: 0
13. Stereochemical center number of of certain chemical bonds: 0
14. Stereochemical center number of of uncertain chemical bonds: 0
15. Number of covalent bond units: 1
Application
As brominating agent in organic synthesis. Reducing agent.
As brominating agent and reducing agent in organic synthesis.

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