Abstract
It is shown that, together with Β-quinindane-9-carboxylic acid, the condensation of isatin with cyclopentanone in alkaline medium (Pfitzinger reaction) also affords α, α′-dicyclopentylidenecyclopentanone and 3-cyclopentylidene-Β-quinindane-9-carboxylic acid, the structure of which was confirmed by its NMR, IR, and UV spectra.
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Kholodov, L.E., Syrova, G.P., Yashunskii, V.G. et al. Quinindines. Chem Heterocycl Compd 6, 75–79 (1970). https://doi.org/10.1007/BF00475430
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DOI: https://doi.org/10.1007/BF00475430