The signs of the two lowest energy Cotton effects of the Δ4-3-oxo-steroids may be rationalized in terms of the contributions of the pseudoaxial bonds on the α′ and γ carbon atoms.
R. N. Totty and J. Hudec, J. Chem. Soc. D, 1971, 785 DOI: 10.1039/C29710000785
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