The apparent unreactivity of endo-dicyclohexadiene to intramolecular cycloaddition is ascribed to the flexibility of the dienophile unit and the ring size of the diene unit, but not to inefficient sensitization.
K. Hirao, S. Unno and O. Yonemitsu, J. Chem. Soc., Chem. Commun., 1977, 577 DOI: 10.1039/C39770000577
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