The radical cation of norbornadiene or quadricyclane (Q) and of norbornadiene (NBD) produced by γ-radiolysis in polar ZSM-5 undergo a reverse Diels–Alder reaction, which is a thermally forbidden, photochemically allowed process, to cyclopentadiene radical cation.
M. V. Barnabas and A. D. Trifunac, J. Chem. Soc., Chem. Commun., 1993, 813 DOI: 10.1039/C39930000813
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