19) Hell Volhard Zelinsky (HVZ) Reaction |Named reaction Carboxylic acid class12 organic #neet #cbse
Preetika's chemistry・2 minutes read
The D-Carboxylic Acid reaction, also known as the Key Vaz Reaction, involves treating D carboxylic acid with D alpha hydrogen, red phosphorus, and halogen to form alpha halo carboxylic acid, crucial for understanding the halo reaction of D carboxylic acid and the detailed mechanism involved. Oxalic acid with alpha hydrogen reacts with red phosphorus and halogen to yield alpha halo carboxylic acid, involving a mechanism where red phosphorus and halogens replace oh with halogen, leading to halogenation on the alpha hydrogen.
Insights
- The D-Carboxylic Acid reaction, also known as the Key Vaz Reaction, involves treating D carboxylic acid with D alpha hydrogen, red phosphorus, and halogen to form alpha halo carboxylic acid, highlighting a specific method for synthesizing this compound.
- The reaction mechanism includes key steps such as halogenation on the alpha carbon, tautomerism resulting in the formation of an enol form, and back bonding with water leading to the creation of alpha halo carboxylic acid, showcasing a detailed and intricate process essential for understanding chemical reactions involving carboxylic acids.
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Recent questions
What is the D-Carboxylic Acid reaction?
The D-Carboxylic Acid reaction, also known as the Key Vaz Reaction, involves treating D carboxylic acid with D alpha hydrogen, red phosphorus, and halogen to form alpha halo carboxylic acid. This reaction is essential for understanding the halo reaction of D carboxylic acid and the detailed mechanism involved in the formation of alpha halo carboxylic acid.
How does the D-Carboxylic Acid reaction begin?
The mechanism of the D-Carboxylic Acid reaction starts with red phosphorus and halogens reacting to form px3, which then reacts with the carboxylic acid to replace oh with halogen, leading to halogenation on the alpha hydrogen. This initial step sets the stage for the formation of alpha halo carboxylic acid.
What role does tautomerism play in the D-Carboxylic Acid reaction?
Tautomerism occurs in the D-Carboxylic Acid reaction as hydrogen transfers electrons to oxygen, resulting in the formation of an enol form from the keto form. This process is crucial for the subsequent steps in the reaction, leading to the formation of alpha halo carboxylic acid.
Why is the addition of water important in the D-Carboxylic Acid reaction?
Water is added in the D-Carboxylic Acid reaction to facilitate the formation of alpha halo carboxylic acid. In this step, oxygen provides electrons to carbon, leading to back bonding and the elimination of X, resulting in the final product of the reaction.
What are the key components required for the D-Carboxylic Acid reaction?
The D-Carboxylic Acid reaction requires D carboxylic acid with D alpha hydrogen, red phosphorus, halogen, and the addition of water in the second step. These components are essential for the successful formation of alpha halo carboxylic acid and understanding the detailed mechanism of the reaction.
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Summary
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Key Vaz Reaction: Forming Alpha Halo Carboxylic Acid
- The D-Carboxylic Acid reaction, also known as the Key Vaz Reaction, involves treating D carboxylic acid with D alpha hydrogen, red phosphorus, and halogen to form alpha halo carboxylic acid.
- Specifically, when oxalic acid with alpha hydrogen is reacted with red phosphorus and halogen, halo nation occurs on the alpha carbon, resulting in alpha halo carboxylic acid.
- The reaction involves taking acid with alpha hydrogens, ensuring the presence of alpha hydrogen, reacting with red phosphorus and halogens in small amounts, and adding water in the second step to yield alpha halo carboxylic acid.
- The mechanism begins with red phosphorus and halogens reacting to form px3, which then reacts with the carboxylic acid to replace oh with halogen, leading to halogenation on the alpha hydrogen.
- Tautomerism occurs as hydrogen transfers electrons to oxygen, resulting in the formation of an enol form from the keto form.
- Subsequently, halogens approach the double bond, leading to the elimination of X and H, forming a double bond O.
- Water is added in the next step, where oxygen provides electrons to carbon, leading to back bonding and the elimination of X, resulting in the formation of alpha halo carboxylic acid.
- The reaction is crucial for understanding the halo reaction of D carboxylic acid and the detailed mechanism involved in the formation of alpha halo carboxylic acid.
