Abstract
The structures of 4H-cyclopenta[k,1,m]phenanthridine-5,9-dione, phenanthridone, and 5,10-dioxo-4,5,9,10-tetrahydro-5-aza-9-oxapyrene were refined by IR and electronic spectroscopy and quantum-chemical calculations, and the order of aromatic substitution of the lactam form of the first compound was evaluated. It is shown that all three compounds exist primarily in the form of lactam tautomers. The long-wave transition in their absorption spectra was interpreted.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1388–1392, October, 1982.
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Zaitsev, B.E., Grekhova, N.G., Sheban, G.V. et al. Structures and reactivities of compounds that contain a phenanthridone grouping. Chem Heterocycl Compd 18, 1079–1083 (1982). https://doi.org/10.1007/BF00503199
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DOI: https://doi.org/10.1007/BF00503199