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<p>in <a href="page.php?w=Hell-Volhard-Zelinsky_halogenation">Hell-Volhard-Zelinsky halogenation</a>.Initially PBr<sub>3</sub> reacts with the carboxylic acid to form the acyl bromide, which is more reactive towards bromination.  The overall process can be represented as</p>

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<p>On a commercial scale, phosphorus tribromide is used in the manufacture of <a href="page.php?w=pharmaceutical">pharmaceutical</a>s such as <a href="page.php?w=alprazolam">alprazolam</a>,</p><p>
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