Organic Chemistry
Organic Chemistry
8th Edition
ISBN: 9781337516402
Author: Brown
Publisher: Cengage
Question
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Chapter 17, Problem 17.41P

(a)

Interpretation Introduction

Interpretation: Mechanism for the given type of decarboxylation reaction has to be proposed and it should be compared with the mechanism of decarboxylation of βketoacid

Concept introduction:

Carboxylic acids contain a carbonyl attached to a hydroxyl group as shown below,

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  1

If carboxylic acid is heated to a very high temperature then of carbon dioxide will be eliminated from it this reaction is known as decarboxylation. Simple carboxylic acids do not decarboxylate readily.

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  2

Decarboxylation of βketoacid is shown below,

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  3

The mechanism of thermal decarboxylation involves two processes,

  1. (i) Redistribution of electrons in a cyclic transition state.
  2. (ii) Cyclic transition state possesses keto-enol tautomerism.

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  4

(b)

Interpretation Introduction

Interpretation: Mechanism for the given type of decarboxylation reaction has to be proposed and it should be compared with the mechanism of decarboxylation of βketoacid

Concept introduction:

Carboxylic acids contain a carbonyl attached to a hydroxyl group as shown below,

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  5

If carboxylic acid is heated to a very high temperature then of carbon dioxide will be eliminated from it this reaction is known as decarboxylation. Simple carboxylic acids do not decarboxylate readily.

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  6

Decarboxylation of βketoacid is shown below,

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  7

Simply the mechanism of thermal decarboxylation involves two processes,

  1. (i) Redistribution of electrons in a cyclic transition state.
  2. (ii) Cyclic transition state possesses keto-enol tautomerism.

Organic Chemistry, Chapter 17, Problem 17.41P , additional homework tip  8

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Chapter 17 Solutions

Organic Chemistry

Ch. 17 - Write the IUPAC name of each compound, showing...Ch. 17 - Prob. 17.8PCh. 17 - Prob. 17.9PCh. 17 - Prob. 17.10PCh. 17 - Prob. 17.11PCh. 17 - Prob. 17.12PCh. 17 - Prob. 17.13PCh. 17 - On a cyclohexane ring, an axial carboxyl group has...Ch. 17 - Prob. 17.15PCh. 17 - Prob. 17.16PCh. 17 - Prob. 17.17PCh. 17 - Complete each reaction.Ch. 17 - Prob. 17.19PCh. 17 - Prob. 17.20PCh. 17 - Prob. 17.21PCh. 17 - Show the reagents and experimental conditions...Ch. 17 - Prob. 17.23PCh. 17 - Prob. 17.24PCh. 17 - Prob. 17.25PCh. 17 - In each set, assign the acid its appropriate pKa.Ch. 17 - Low-molecular-weight dicarboxylic acids normally...Ch. 17 - Complete the following acid-base reactions. (a)...Ch. 17 - Prob. 17.29PCh. 17 - Prob. 17.30PCh. 17 - Excess ascorbic acid is excreted in the urine, the...Ch. 17 - Give the expected organic product when...Ch. 17 - Show how to convert trans-3-phenyl-2-propenoic...Ch. 17 - Show how to convert 3-oxobutanoic acid...Ch. 17 - Prob. 17.35PCh. 17 - Prob. 17.36PCh. 17 - Prob. 17.37PCh. 17 - When 4-hydroxybutanoic acid is treated with an...Ch. 17 - Fischer esterification cannot be used to prepare...Ch. 17 - Draw the product formed on thermal decarboxylation...Ch. 17 - Prob. 17.41PCh. 17 - Show how cyclohexanecarboxylic acid could be...Ch. 17 - Prob. 17.43PCh. 17 - Prob. 17.44PCh. 17 - Prob. 17.45PCh. 17 - Write the products of the following sequences of...Ch. 17 - Using your reaction roadmaps as a guide, show how...Ch. 17 - Using your reaction roadmaps as a guide, show how...Ch. 17 - Using your reaction roadmaps as a guide, show how...Ch. 17 - Using your reaction roadmaps as a guide, show how...Ch. 17 - Prob. 17.51PCh. 17 - Complete the following Fischer esterification...Ch. 17 - Prob. 17.53P
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