Abstract
The integral intensities of the absorption bands of the carbonyl groups (AC=O) of 2-phenylcyclopenta[b]chromene derivatives were determined. The AC=O values and the VC=O frequencies are proposed as criteria for the determination of the positions of the aldehyde and ketone groups in cyclopenta[b]chromenes. The applicability of these criteria was confirmed by 13C NMR spectroscopy of the carbonyl bonds. A qualitative relationship between the AC=O values and the 13C chemical shifts of the bonds of a number of carbonyl-containing compounds was found.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1030–1034, August, 1980.
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Zaitsev, B.E., Churkina, V.A. & Porshnev, Y.N. Frequencies and intensities of the carbonyl IR absorption bands and structures of cyclopenta [b] chromene derivatives. Chem Heterocycl Compd 16, 795–799 (1980). https://doi.org/10.1007/BF00513156
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DOI: https://doi.org/10.1007/BF00513156