(a) Interpretation: The following pericyclic reaction is to be classified. (More than one classification is possible.) Concept introduction: Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

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Answer 1

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Chapter 28, Problem 28.32AP

Interpretation Introduction

(a)

Interpretation:

The following pericyclic reaction is to be classified. (More than one classification is possible.)

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

Interpretation Introduction

(b)

Interpretation:

Suppose the migrating methyl group in part (a) were labeled with the hydrogen isotopes deuterium (D) and tritium (T) so that it is a -CHDT group with the S configuration. The configuration of this group in the product is to be stated.

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system.

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Show how you would accomplish the following transformations. More than one step may be required. ow all reagents and all intermediate structures [one ONLY] A. H Br H CH3 NHz CH3 CH3 B. CH3CH2C-Br CH3CH2C-CN CH3 CH3.

Show how you would accomplish the following transformations. More than one step may be required. now all reagents and all intermediate structures [one ONLY] A. H Br H CH3 NHz CH3 CH3 B. CH3CH2C-Br CH3 CH3CH2C-CN CH3

Answer 2

Question

Chapter 28, Problem 28.32AP

Interpretation Introduction

(a)

Interpretation:

The following pericyclic reaction is to be classified. (More than one classification is possible.)

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

Interpretation Introduction

(b)

Interpretation:

Suppose the migrating methyl group in part (a) were labeled with the hydrogen isotopes deuterium (D) and tritium (T) so that it is a -CHDT group with the S configuration. The configuration of this group in the product is to be stated.

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system.

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Answer 3

Question

Chapter 28, Problem 28.32AP

Interpretation Introduction

(a)

Interpretation:

The following pericyclic reaction is to be classified. (More than one classification is possible.)

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

Interpretation Introduction

(b)

Interpretation:

Suppose the migrating methyl group in part (a) were labeled with the hydrogen isotopes deuterium (D) and tritium (T) so that it is a -CHDT group with the S configuration. The configuration of this group in the product is to be stated.

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system.

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Answer 4

Question

Chapter 28, Problem 28.32AP

Interpretation Introduction

(a)

Interpretation:

The following pericyclic reaction is to be classified. (More than one classification is possible.)

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

Interpretation Introduction

(b)

Interpretation:

Suppose the migrating methyl group in part (a) were labeled with the hydrogen isotopes deuterium (D) and tritium (T) so that it is a -CHDT group with the S configuration. The configuration of this group in the product is to be stated.

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system.

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Answer 5

Chapter 28, Problem 28.32AP

Interpretation Introduction

(a)

Interpretation:

The following pericyclic reaction is to be classified. (More than one classification is possible.)

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

Interpretation Introduction

(b)

Interpretation:

Suppose the migrating methyl group in part (a) were labeled with the hydrogen isotopes deuterium (D) and tritium (T) so that it is a -CHDT group with the S configuration. The configuration of this group in the product is to be stated.

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system.

Answer 6

Chapter 28, Problem 28.32AP

Interpretation Introduction

(a)

Interpretation:

The following pericyclic reaction is to be classified. (More than one classification is possible.)

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

Answer 7

Chapter 28, Problem 28.32AP

Interpretation Introduction

(a)

Interpretation:

The following pericyclic reaction is to be classified. (More than one classification is possible.)

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system. The formation of sigma bond at 3, 3-position of a 1, 5-diene is called as cope rearrangement.

Answer 8

Interpretation Introduction

(b)

Interpretation:

Suppose the migrating methyl group in part (a) were labeled with the hydrogen isotopes deuterium (D) and tritium (T) so that it is a -CHDT group with the S configuration. The configuration of this group in the product is to be stated.

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system.

Answer 9

Interpretation Introduction

(b)

Interpretation:

Suppose the migrating methyl group in part (a) were labeled with the hydrogen isotopes deuterium (D) and tritium (T) so that it is a -CHDT group with the S configuration. The configuration of this group in the product is to be stated.

Concept introduction:

Sigmatropic reaction can be described as the migration of allylic sigma bond at one end of the π-electron system to the other end of the π-electron system as an uncatalyzed intramolecular reaction. In some cases, Lewis acid catalysts can also be applied. Though, the position of π-bond is changed in Sigmatropic reaction, the total number of π-bonds remain unchanged. The sigma bond can be cleaved at the middle or at the end of the π-system.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 28 - Prob. 28.1P Ch. 28 - Prob. 28.2P Ch. 28 - Prob. 28.3P Ch. 28 - Prob. 28.4P Ch. 28 - Prob. 28.5P Ch. 28 - Prob. 28.6P Ch. 28 - Prob. 28.7P Ch. 28 - Prob. 28.8P Ch. 28 - Prob. 28.9P Ch. 28 - Prob. 28.10P

Solution Summary: The author explains that the pericyclic reaction can be classified as an uncatalyzed intramolecular reaction.

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