Hell-Volhard-Zelinsky Reaction

Hell-Volhard-Zelinsky Reaction Definition:

A reaction in which a carboxylic acid undergoes a-halogenation when treated with bromine in the
presence of PBr3.

Hell-Volhard-Zelinsky Reaction Explained:

Phosphorous reacts with bromine to give phosphorous tribune, and in the first step it converts the carboxylic acid into acyl bromide.