For each of the given sigmatropic rearrangement reactions, the type of sigmtropic rearrangement should be identified and denote by using brackets and two numbers. Concept introduction: Sigmatropic rearrangement reaction is a pericyclic reaction of polyenes ( π-system ) , in which one σ-bond is formed and another σ-bond is broken and remaining π-bonds are shifting their positions. Thereby the transition state is cyclic . The Sigmatropic rearrangement reaction is represented by using two numbers in the brackets . The numbers represent the numbers of atoms separating the σ-bond which is breaking and the σ -bond which is forming.

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Chapter 17.10, Problem 25CC

(a)

Interpretation Introduction

Interpretation:

For each of the given sigmatropic rearrangement reactions, the type of sigmtropic rearrangement should be identified and denote by using brackets and two numbers.

Concept introduction:

Sigmatropic rearrangement reaction is a pericyclic reaction of polyenes (π-system), in which one σ-bond is formed and another σ-bond is broken and remaining π-bonds are shifting their positions. Thereby the transition state is cyclic.

The Sigmatropic rearrangement reaction is represented by using two numbers in the brackets. The numbers represent the numbers of atoms separating the σ-bond which is breaking and the σ-bond which is forming.

(b)

Interpretation Introduction

Interpretation:

For each of the given sigmatropic rearrangement reactions, the type of sigmtropic rearrangement should be identified and denote by using brackets and two numbers.

Concept introduction:

Sigmatropic rearrangement reaction is a pericyclic reaction of polyenes (π-system), in which one σ-bond is formed and another σ-bond is broken and remaining π-bonds are shifting their positions. Thereby the transition state is cyclic.

The Sigmatropic rearrangement reaction is represented by using two numbers in the brackets. The numbers represent the numbers of atoms separating the σ-bond which is breaking and the σ-bond which is forming.

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