Chapter 16, Problem 16.21P

Interpretation Introduction

Interpretation: The diene that reacts faster in the Diels-Alder reaction is to be stated with an explanation.

Concept introduction: Diene is a hydrocarbon that contains two $\text{C}=\text{C}$ double bonds in a compound.

Diels-alder reaction is a cycloaddition reaction in which two molecules combine to form a new ring. In this type of reaction, syn addition takes place. It is a reaction between diene with a dienophile to yield a cyclohexene. The dienophile adds to one side of the diene, and diene adds to the one side of the dienophile. Thus, they have syn or cis stereochemistry.