Which statement is NOT true about the Diels-Alder reaction?

Question

Quizplus · Accepted Answer

The Diels-Alder reaction is not a sigmatropic rearrangement. It involves the formation of a new cyclic compound through the combination of a diene and a dienophile. The other statements are true about the Diels-Alder reaction: it is a [4+2] cycloaddition reaction, the diene must be in s-cis conformation to react, most Diels-Alder reactions are reversible, and presence of electron donating groups on the diene and electron withdrawing groups on the dienophile favor product formation.

Which Statement Is NOT True About the Diels-Alder Reaction