Chapter 13, Problem 1PP

Interpretation Introduction

Interpretation: The product formed after reaction of cyclohexane in the presence of $\text{NBS}$ and ${\text{R}}_2{\text{O}}_2$ is to be determined.

Concept introduction:

$\text{NBS}$ is an oxidizing agent. The most common use of $\text{NBS}$ is allylic bromination.

Chemical reaction in the presence of a free radical is called as free radical reaction.

Molecules that have one unpaired electron are called free radicals.

${\text{R}}_2{\text{O}}_2$ is used for chain initiation. The bond of oxygen–oxygen atom in ${\text{R}}_2{\text{O}}_2$ is weak, and breaks easily. Each oxygen gets single electron. Free radicals are formed.

Answer to Problem 1PP

Solution:

Explanation of Solution

Given information:

The reaction in the presence of $\text{NBS}$ and ${\text{R}}_2{\text{O}}_2$ is a free radical substitution reaction. A chemical reaction in the presence of a free radical is called as free radical reaction. Molecules that have one unpaired electron are called as free radicals. $\text{NBS}$ is an oxidizing agent. It provides low concentration of bromine. The most common use of $\text{NBS}$ is allylic bromination.

Allylic bromination is a free radical substitution reaction in which removal of hydrogen atom on carbon adjacent to a double bond with bromine.

Free radical substitution reaction takes place in the presence of $\text{NBS}$ and ${\text{R}}_2{\text{O}}_2$.

The structure of 3-bromocyclohexence is as follows:

Conclusion

The product formed after free radical substitution is 3-bromocyclohexence.