Question

Question: Draw the product of each Diels–Alder reaction.

a.

b.

Short answer

Answer

a.

b.

Step-by-step solution

Diels-Alder reaction

Diels-Alder reaction is also known as $\left[4\mathrm{\pi }+2\mathrm{\pi }\right]$ cycloaddition.

This reaction is thermally allowed, but it is photochemically forbidden.

Mechanism of Diels-Alder reaction

Mechanism of the Diels-Alder reaction using an example is shown below:

Mechanism of Diels-Alder reaction

To find the product of the reaction

The product with endo substitution will be preferred for the Diels-Alder reaction.

The Diels-Alder reaction of cyclopentadiene is shown below:

Diels-Alder reaction

The product obtained contains an endo substituent.