The isomeric (Z)- and (E)-3-ethylidene-5α-cholestanes have been synthesized, and their c.d. curves determined. The chiral unit of structure represented by a conformationally rigid ethylidenecyclohexane unit (XIVa or b) makes a major contribution to the c.d. of these and some other olefinic steroids.
D. N. Kirk and R. J. Mullins, J. Chem. Soc., Perkin Trans. 1, 1974, 14b DOI: 10.1039/P1974000014B
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