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Diels- Alder reaction is similar to Michael reactionas both are 1,4 – addition reaction in this cyclic reaction product is formed thus also known as cyclic addition or cycloaddition reaction.

The product formed in Diels – Alder reaction is called adduct, here the reaction takes place between a conjugated diene and alkene or substituted alkene.

In Diels Alder's reaction, two molecules combine to form a new ring in a one-step, known as a concerted reaction. This reaction involves the concerted forming and breaking of bonds within a closed ring of interacting orbitals.

Benzyne (produced from chlorobenzene and NaOH, heated) act as the dienophile when reacted with cyclopentadiene acting as a diene Diels alder reaction occurs and forms the new ring as the final product in Diels Alder's reaction.