Organic Chemistry
Organic Chemistry
6th Edition
ISBN: 9781936221349
Author: Marc Loudon, Jim Parise
Publisher: W. H. Freeman
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Chapter 20, Problem 20.19P
Interpretation Introduction

(a)

Interpretation:

The carboxylic acid among: fumaric acid and maleic acid, which forms a cyclic anhydride is to be stated. Also, the explanation for the corresponding reaction is to be stated.

Concept introduction:

The general structure of carboxylic acid anhydrides is RCOOCOR'. Anhydrides are prepared when a carboxylic acid is reacted with a strong dehydrating agent like phosphorus pentoxide. Cyclic anhydrides are formed by two methods. In one method, a dicarboxylic acid is treated with acetic anhydride and in second method; a dicarboxylic acid fuses into cyclic anhydride on heating.

Interpretation Introduction

(b)

Interpretation:

The carboxylic acid among: methylmalonic acid and 2, 3-dimethylbutanedioicacid which forms a cyclic anhydride on heating is to be stated.

Concept introduction:

The general structure of carboxylic acid anhydrides is RCOOCOR'. Anhydrides are prepared when a carboxylic acid is reacted with a strong dehydrating agent like phosphorus pentoxide. Cyclic anhydrides are formed by two methods. In one method, a dicarboxylic acid is treated with acetic anhydride and in second method; a dicarboxylic acid fuses into cyclic anhydride on heating.

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