Hell – Volhard – Zelinsky reaction
Halogenation of carboxylic acid
Carboxylic acid reacts with chloride in presence of red
phosphorus to give α – halocarboxylic acid. This reaction occurs in the presence of Red phosphorous. In this reaction, the hydrogens present in the α – carbon is replaced by chlorine one at a time. This reaction is known as Hell - Volhard - Zelinsky reaction.
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