A new approach to the isolation of unstable cyclopentadienones from dissociating dimers is described; 2,5-dimethyl-3,4-diphenylcyclopentadienone (1d) and two other derivatives, (1e) and (1f), were obtained in crystalline state and their spectral properties were investigated, and irradiation of (1d) in the crystal quantitatively gave the cage-product (3).
B. Fuchs and M. Pasternak, J. Chem. Soc., Chem. Commun., 1977, 537 DOI: 10.1039/C39770000537
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