Question
Download Solution PDFAcetic anhydride is used as -
(i) Acetylating agent
(ii) Dehydrating agent
(iii) Reagent in Perkin reaction
(iv) Methylating agent
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept and Explanation:
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Uses of Acetic Anhydride: Acetic anhydride is a versatile reagent in organic chemistry.
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(i) Acetylating Agent: Acetic anhydride is widely used as an acetylating agent to introduce the acetyl group (−COCH3) into molecules. This is a common reaction in the synthesis of esters and amides.
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(ii) Dehydrating Agent: It acts as a dehydrating agent in many chemical reactions, facilitating the removal of water.
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(iii) Reagent in Perkin Reaction: Acetic anhydride is used as a reagent in the Perkin reaction, which is a method for synthesizing α,β-unsaturated aromatic aldehydes by the aldol condensation of an aromatic aldehyde with an acid anhydride in the presence of a base.
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(iv) Methylating Agent: Acetic anhydride is not typically used as a methylating agent. Methylation usually involves reagents that donate a methyl group (−CH3), such as methyl iodide, methyl sulfate, or methyl triflate.
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Conclusion:
The correct uses of acetic anhydride are: only (i), (ii) and (iii)
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