Chapter 16.10, Problem 23CC

(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.