Chapter 24, Problem 24.18P

Interpretation Introduction

Interpretation:

The product with curved arrow notation for the given reaction is to be drawn.

Concept introduction:

The Diels-Alder reaction is the cycloaddition of diene and dienophile. The diene has a pair of conjugate double bond and contributes its $\text{4π}$ electrons. The dienophile contributes only one double bond and contributes its $\text{2π}$ electrons. These six electrons must flow in a cyclic fashion. Thus, the reaction proceeds through a cyclic transition state, which makes it a pericyclic reaction. Therefore, the Diels-Alder reaction is called $\text{[4+2]}$ cycloaddition. The two $\text{C=C}$ bonds in diene must be conjugated and able to attain the $s\text{-cis}$ conformation.