Chapter 12.17, Problem 19P

Interpretation Introduction

Interpretation:

The reaction of dienes to which the given reaction resembles is to be identified.

Concept introduction:

The Diels Alder reaction is categorized as a $\text{[4+2]-cycloaddition}$.

One reactant contributes four $\text{π}$ electrons. The other reactant contributes two $\text{π}$ electrons.

In the transition state, there are six $\text{π}$ electrons. The resulting product has two new single bonds formed.

This reaction is the combination of a diene and a dienophile.