The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction. Concept introduction: Pericyclic reactions are “ any concerted reaction in which bonds are formed or broken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction. There are mainly three types of pericyclic reactions, 1) Electrocyclic reactions 2) Cycloaddition reactions 3) Sigmatropic reactions In an electrocyclic reaction “one new sigma- bond is formed or broken.” In a cycloaddition reaction “ two new sigma-bonds are formed or broken” In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

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Answer 1

Question

Chapter 28.1, Problem 1P

(a)

Interpretation Introduction

Interpretation:

The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(b)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(c)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(d)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

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Is this aromatic?

Answer 2

Question

Chapter 28.1, Problem 1P

(a)

Interpretation Introduction

Interpretation:

The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(b)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(c)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(d)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Expert Solution & Answer

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Answer 3

Question

Chapter 28.1, Problem 1P

(a)

Interpretation Introduction

Interpretation:

The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(b)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(c)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(d)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

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Answer 4

Question

Chapter 28.1, Problem 1P

(a)

Interpretation Introduction

Interpretation:

The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(b)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(c)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(d)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Expert Solution & Answer

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See solution

Answer 5

Chapter 28.1, Problem 1P

(a)

Interpretation Introduction

Interpretation:

The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(b)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(c)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

(d)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 6

Chapter 28.1, Problem 1P

(a)

Interpretation Introduction

Interpretation:

The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 7

Chapter 28.1, Problem 1P

(a)

Interpretation Introduction

Interpretation:

The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 8

(b)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 9

(b)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 10

(c)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 11

(c)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 12

(d)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 13

(d)

Interpretation Introduction

Interpretation: The given reaction has to be identified as electro cyclic reaction, a cycloaddition reaction or a sigma tropic reaction.

Concept introduction:

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

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

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

In a cycloaddition reaction “ two new sigma-bonds are formed or broken”

In a sigmatropic rearrangement reaction “ one new sigma-bond is formed as another breaks.”

Answer 14

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Answer 15

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Answer 16

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Answer 17

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

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Chapter 28 Solutions