Essential Organic Chemistry, Global Edition
Essential Organic Chemistry, Global Edition
3rd Edition
ISBN: 9781292089034
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Chapter 11, Problem 47P
Interpretation Introduction

Interpretation:

The reaction mechanism for the formation of an anhydride from the reaction of butanedioic acid and thionyl chloride has to be proposed.

Concept introduction:

Dicarboxylic acid reacts with thionyl chloride and undergoes nucleophilic substitiution reaction at one carboxylic group to form acyl chloride.

Acyl chloride is the most reactive carboxylic derivative functional group and hence nucleophilic OH group of the second carboxylic group attacks the carbonyl group of the acyl group. Chloride ion leaves as the leaving group and cyclic anhydride product from the dicarboxylic acid is formed.

Example:

  Essential Organic Chemistry, Global Edition, Chapter 11, Problem 47P

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When a student treated butanedioic acid with thionyl chloride, she was surprised to find that the product she obtained was an anhydride rather than an acyl chloride. Propose a mechanism to explain why she obtained an anhydride.
The following reaction is known as the benzoin condensation. The reaction does not take place if sodium hydroxide is used instead of sodium cyanide.Propose a mechanism for the reaction and explain why the reaction does not occur if hydroxide ion is the base.
The following reaction is known as the benzoin condensation. The reaction does not take place if sodium hydroxide is used instead of sodium cyanide. Propose a mechanism for the reaction and explain why the reaction does not occur if hydroxide ion is the base.

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Essential Organic Chemistry, Global Edition

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