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with bromine. An excess of phosphorus is used in order to prevent formation of PBr₅:
:P₄ + 6 Br₂ -> 4 PBr₃Because the reaction is highly exothermic, it is often conducted in the presence of a diluent such as PBr₃. Phosphorus tribromide is also generated in situ from red phosphorus and bromine.

Reactions

Phosphorus tribromide, like PCl₃ and

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