The dienes that do not undergo Diels-Alder reaction has to be predicted. Concept Introduction: Diels-Alder reaction: A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product. Conformation of Diene: S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer. S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer. Condition for Diels-Alder reaction: The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction. Rule: The stabilities of carbocation are, Benzyl cation = allyl cation = 3 ∘ carbocation > 2 ∘ carbocation > 1 ∘ carbocation > methyl cation > vinyl cation

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Answer 1

Question

Chapter 8.14, Problem 43P

Interpretation Introduction

Interpretation:

The dienes that do not undergo Diels-Alder reaction has to be predicted.

Concept Introduction:

Diels-Alder reaction:

A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.

Conformation of Diene:

S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.

S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.

Condition for Diels-Alder reaction:

The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

Rule: The stabilities of carbocation are,

Benzyl cation = allyl cation = 3∘carbocation > 2∘ carbocation > 1∘ carbocation > methyl cation > vinyl cation

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Answer 2

Question

Chapter 8.14, Problem 43P

Interpretation Introduction

Interpretation:

The dienes that do not undergo Diels-Alder reaction has to be predicted.

Concept Introduction:

Diels-Alder reaction:

A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.

Conformation of Diene:

S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.

S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.

Condition for Diels-Alder reaction:

The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

Rule: The stabilities of carbocation are,

Benzyl cation = allyl cation = 3∘carbocation > 2∘ carbocation > 1∘ carbocation > methyl cation > vinyl cation

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Answer 3

Question

Chapter 8.14, Problem 43P

Interpretation Introduction

Interpretation:

The dienes that do not undergo Diels-Alder reaction has to be predicted.

Concept Introduction:

Diels-Alder reaction:

A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.

Conformation of Diene:

S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.

S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.

Condition for Diels-Alder reaction:

The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

Rule: The stabilities of carbocation are,

Benzyl cation = allyl cation = 3∘carbocation > 2∘ carbocation > 1∘ carbocation > methyl cation > vinyl cation

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Answer 4

Question

Chapter 8.14, Problem 43P

Interpretation Introduction

Interpretation:

The dienes that do not undergo Diels-Alder reaction has to be predicted.

Concept Introduction:

Diels-Alder reaction:

A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.

Conformation of Diene:

S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.

S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.

Condition for Diels-Alder reaction:

The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

Rule: The stabilities of carbocation are,

Benzyl cation = allyl cation = 3∘carbocation > 2∘ carbocation > 1∘ carbocation > methyl cation > vinyl cation

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Answer 5

Chapter 8.14, Problem 43P

Interpretation Introduction

Interpretation:

The dienes that do not undergo Diels-Alder reaction has to be predicted.

Concept Introduction:

Diels-Alder reaction:

A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.

Conformation of Diene:

S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.

S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.

Condition for Diels-Alder reaction:

The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

Rule: The stabilities of carbocation are,

Benzyl cation = allyl cation = 3∘carbocation > 2∘ carbocation > 1∘ carbocation > methyl cation > vinyl cation

Answer 6

Chapter 8.14, Problem 43P

Interpretation Introduction

Interpretation:

The dienes that do not undergo Diels-Alder reaction has to be predicted.

Concept Introduction:

Diels-Alder reaction:

A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.

Conformation of Diene:

S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.

S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.

Condition for Diels-Alder reaction:

The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

Rule: The stabilities of carbocation are,

Benzyl cation = allyl cation = 3∘carbocation > 2∘ carbocation > 1∘ carbocation > methyl cation > vinyl cation

Answer 7

Chapter 8.14, Problem 43P

Interpretation Introduction

Interpretation:

The dienes that do not undergo Diels-Alder reaction has to be predicted.

Concept Introduction:

Diels-Alder reaction:

A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.

Conformation of Diene:

S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.

S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.

Condition for Diels-Alder reaction:

The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

Rule: The stabilities of carbocation are,

Benzyl cation = allyl cation = 3∘carbocation > 2∘ carbocation > 1∘ carbocation > methyl cation > vinyl cation

Answer 8

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Answer 9

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Answer 10

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Answer 11

Ch. 8.1 - Prob. 1P Ch. 8.1 - Prob. 2P Ch. 8.4 - Prob. 3P Ch. 8.5 - Prob. 4P Ch. 8.5 - Prob. 6P Ch. 8.6 - a. Predict the relative bond lengths of the three...Ch. 8.6 - Prob. 8P Ch. 8.6 - Prob. 9P Ch. 8.6 - Prob. 10P Ch. 8.7 - Prob. 11P

Solution Summary: The author explains that dienes that do not undergo Diels-Alder reaction have to be predicted.

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