Factors that determine the reactivity of reactants in normal and catalysed Diels–Alder reactions

The effects of intermolecular stabilisation, the energies of the reacting bonds, and the geometry of the reactants on their reactivity in normal Diels–Alder reactions and those catalysed by Lewis acids have been analysed. The main causes of the small (1–10² times) or large (10⁴–10⁹ times) increase in the rate of the process in the presence of catalysts and the conditions for synthesising products which often cannot be obtained when the reaction is carried out in the absence of a catalyst are examined.
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