Question

Synthetic importance of hell volhard zelinsky reaction

Answer 1

Explanation:

$<p style ="Color:cyan; font-family: cursive; background:black;font size25px;"> Carboxalic acid having an Alpha hydrogen are generated at the Alpha position on treatment with chlorine or bromine in the presence of a small amount of red phosphorus to give alpha hello oxalic acid this reaction is known as Hell volhard zelinsky reaction$

Answer 2

The synthetic importance of the HVZ reaction is given below.

• Hell Volhard Zelinsky reaction is used to halogenate carboxylic acids at alpha carbon.
• Phosphorous tribromide is the catalyst used here.
• Phosphorous and bromine react with each other to give Phosphorous tribromide
• In the first step carboxylic acid gets converted into acyl bromide.
• Tautomerism exists between acyl form and enol form.
• The enol form is brominated to give alpha Bromo carboxylic acid.
• HVZ reaction is used in the synthesis of amino acids
• It is also used for the bromination of carboxylic acid.
• #SPJ3