The preparation of some substituted androstane 4- and 6-ketones is described revealing further examples of neighbouring group participation between substituents at C-4 and C-6; the X-ray crystal structure of androstane-4,6,17-trione showed that it existed in a form that was a hybrid of the Δ4- and Δ6-enolates.
N. Flaih, J. R. Hanson, P. B. Hitchcock and I. Kiran, J. Chem. Res. (S), 1999, 258 DOI: 10.1039/A900022D
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