ChemistryOrganic Chemistry

The Diels–Alder Reaction Is Concerted: Define Concerted

Concerted means that the bond changes occur in a single elementary step, without a discrete reaction intermediate.

Question

The Diels Alder reaction is a concerted reaction. Define concerted.

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Evidence boundary

This answer concerns the conventional concerted Diels–Alder mechanism requested by the prompt. Concerted does not mean that both new bonds must form equally far at every instant; unusual substrates or conditions require separate mechanistic evidence.