The title compound (2) has been prepared both from cyclopent-4-ene-1,3-dione and from 5,5′-bi(cyclopentadiene). The spectral data indicate the exclusive existence of (2) in the keto-form.
M. Kasai, M. Funamizu, M. Oda and Y. Kitahara, J. Chem. Soc., Perkin Trans. 1, 1977, 1660 DOI: 10.1039/P19770001660
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