Orgo II Mini-Tutorial: HVZ reaction

Question

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${\bf{Overview:}}$ the Hell-Volhard-Zelinski (yes, that's what it's actually called) reaction involves a a carboxylic acid (with alpha hydrogens) reacting with phosphorus to halogenate  the acid at the alpha carbon

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${\bf{Synthetic~Applications:}}$ this method can be used to synthesize alpha-hydroxy acids and alpha-amino acids

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Anyway, that's the end of my tutorial, I hope it was a helpful resource. Source material is Organic Chemistry 12th edition by Solomons, et. al.