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- W2153492844 abstract "NMR spectral data are given for the A-ring in ten 4-en-3-one steroids, and the strategy of the spectral analysis is described. The data are interpreted in terms of an equilibrium between normal and inverted half-chair conformations, with the normal conformation predominant in all cases except when 2β-acetoxy substitution forces inversion. Substitution at the 17α position has no measurable effect upon the A-ring conformation while 6α and 19-nor substitution have only a small effect. Unsaturation at the C-5 position results in a flattened A-ring. The results obtained from NMR are compared with those obtained by x-ray crystallography. The A-ring conformation shows far less variation in solution than it does in the solid." @default.
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- W2153492844 date "1987-01-01" @default.
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- W2153492844 title "An NMR study of A-ring conformation in some 4-en-3-one steroids" @default.
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- W2153492844 doi "https://doi.org/10.1002/mrc.1260250107" @default.
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