The carbonyl group of aromatic aldehydes substituted in the benzene ring by electron-withdrawing groups may act as a dieneophile in a thermally induced cycloaddition reaction leading to dihydropyran derivatives; the same compounds and other dihydropyran derivatives; the same compounds and other dihydropyrans may also be obtained from dienes and these and other aromatic aldehydes by an alternative acid-catalysed reaction.
M. F. Ansell and A. A. Charalambides, J. Chem. Soc., Chem. Commun., 1972, 739 DOI: 10.1039/C39720000739
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