A mechanism should be proposed for the given reaction. Concept introduction: Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction. In an electrocyclic reaction “one new sigma- bond is formed or brocken.” Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts. Mechanism gives the step wise processes occurs in a particular reaction.

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Answer 1

Question

Chapter 28, Problem 38P

(a)

Interpretation Introduction

Interpretation:

A mechanism should be proposed for the given reaction.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

(b)

Interpretation Introduction

Interpretation:

The product should be determined for the given reaction if trans-2-butene were used instead of ethene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

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The diene shown below will NOT react in a Diels-Alder reaction. Why not? Select one: OA. The compound is lacking in electron withdrawing groups. B. The compound is not a conjugated diene. O C. The compound is lacking in electron donating groups. OD. This compound cannot adopt the s-cis conformation.

a. Propose a mechanism for the following reaction. (Hint: An electrocyclic reaction is followed by a Diels–Alder reaction.)b. What would be the product if trans-2-butene were used instead of ethene?

1. In a Birch reaction, an aromatic compound can be treated with Na/CH3OH, it can also be treated with Li/NH3 and have the same product form. One of the intermediates in the Birch reaction is a radical anion. In the example below, anisole could possibly form a radical anion A or B, then will go into C and D. Li/NH3 A B C D A. With the knowledge you have gained from what we have discussed, which anion A or B is more stable? What is your reasoning? B. Is a Birch reaction and oxidation or reduction? Why?

Answer 2

Question

Chapter 28, Problem 38P

(a)

Interpretation Introduction

Interpretation:

A mechanism should be proposed for the given reaction.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

(b)

Interpretation Introduction

Interpretation:

The product should be determined for the given reaction if trans-2-butene were used instead of ethene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

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Answer 3

Question

Chapter 28, Problem 38P

(a)

Interpretation Introduction

Interpretation:

A mechanism should be proposed for the given reaction.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

(b)

Interpretation Introduction

Interpretation:

The product should be determined for the given reaction if trans-2-butene were used instead of ethene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

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Answer 4

Question

Chapter 28, Problem 38P

(a)

Interpretation Introduction

Interpretation:

A mechanism should be proposed for the given reaction.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

(b)

Interpretation Introduction

Interpretation:

The product should be determined for the given reaction if trans-2-butene were used instead of ethene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

Expert Solution & Answer

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Answer 5

Chapter 28, Problem 38P

(a)

Interpretation Introduction

Interpretation:

A mechanism should be proposed for the given reaction.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

(b)

Interpretation Introduction

Interpretation:

The product should be determined for the given reaction if trans-2-butene were used instead of ethene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

Answer 6

Chapter 28, Problem 38P

(a)

Interpretation Introduction

Interpretation:

A mechanism should be proposed for the given reaction.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

Answer 7

Chapter 28, Problem 38P

(a)

Interpretation Introduction

Interpretation:

A mechanism should be proposed for the given reaction.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

Answer 8

(b)

Interpretation Introduction

Interpretation:

The product should be determined for the given reaction if trans-2-butene were used instead of ethene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

Answer 9

(b)

Interpretation Introduction

Interpretation:

The product should be determined for the given reaction if trans-2-butene were used instead of ethene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

Diels-alder reaction is a cycloaddition reaction which is occurs between a conjugated diene and substituted alkene to form cyclohexene ring system. This concerted reaction can be accelerated by heating or using some catalysts.

Mechanism gives the step wise processes occurs in a particular reaction.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 28.1 - Prob. 1P Ch. 28.2 - Prob. 2P Ch. 28.2 - Prob. 3P Ch. 28.2 - Give a molecular orbital description for each of...Ch. 28.3 - Prob. 5P Ch. 28.3 - Prob. 6P Ch. 28.3 - Prob. 7P Ch. 28.3 - Prob. 8P Ch. 28.4 - Prob. 10P Ch. 28.4 - Prob. 11P

Solution Summary: The author explains that a mechanism should be proposed for the given reaction.

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Chapter 28 Solutions