Chapter 16.7, Problem 15CC

Interpretation Introduction

Interpretation:

The more reactive diene for a Diels-Alder reaction in the given two isomers of $\text{2,4-hexadiene}$ should be identified with explanation.

Concept introduction:

• Diels-Alder reaction is a $\left[\text{4+2}\right]\text{ cycloaddition}$ reaction, in which a π-system having four atoms (diene) and a π-system having two atoms (dienophile) are undergoing in cycloaddition reaction and producing a substituted cyclohexene.
• Only the diene in s-cis conformation will undergo Diels-Alder reaction with dienophile.
• The more steric hindrance in the dienes will be less reactive for the Diels-Alder reaction.

To determine: the more reactive diene for a Diels-Alder reaction in the given two isomers of $\text{2,4-hexadiene}$.