Conclusions
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1.
An analysis was made of the high-resolution13C NMR spectra of nine new 20-ketoteroids modified in ring D with an additional cyclobutane, cyclobutene, cyclohexane, or cyclohexene ring D' at positions 16,17.
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2.
On the basis of the NOE coefficients the orientations of rings D' in relation to the steroid skeleton were determined. In the case of the cyclobutene ring D' it was shown that δC14 and δC12 are characteristic of the α,α and β,β orientations of ring D'.
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3.
During analysis of the mutual effects of ring D' and the steroid skeleton on their δ13C values an abnormally large descreening effect was found from the cyclobutene ring in the β,β orientation on δC14.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2315–2321, October, 1986.
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Bogdanov, V.S., Cherepanova, E.G., Levina, I.S. et al. High-resolution13C NMR spectra and structure of steroids of the pregnane series containing additional four-or six-membered rings D' at positions 16,17. Russ Chem Bull 35, 2119–2124 (1986). https://doi.org/10.1007/BF00957537
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DOI: https://doi.org/10.1007/BF00957537