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Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079

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Chapter
Section
BuyFindarrow_forward

Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079
Textbook Problem

What are lactones, and by what chemical reaction are they produced?

Interpretation Introduction

Interpretation:

The chemical reaction that gives lactones as product has to be given and what are lactones has to be explained.

Concept Introduction:

Esters are prepared by condensation of carboxylic acid with an alcohol.  A molecule of water is lost on this reaction.  The reaction that takes place in producing esters is known as esterification reaction.

Esterification reaction is the one in which the carboxylic acid is condensed with an alcohol (or phenol) in presence of strong acid catalyst to produce ester.  The general reaction scheme can be given as,

Organic And Biological Chemistry, Chapter 5, Problem 5.87EP

In the above reaction, hydroxyl group is lost from carboxylic acid and hydrogen is lost from alcohol molecule to form water as the byproduct.

If the considered compound is a hydroxyacid, then there is a possibility of intermolecular esterification reaction.  The product obtained in this case is a cyclic ester.  Cyclic esters contain an oxygen atom in the ring and a carbonyl group also.

Explanation

Cyclic ester is formally known as lactones.

Cyclic ester is formed by intermolecular esterification of hydroxyacid...

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