Acta Cryst. (2008). E64, o613  [ doi:10.1107/S1600536808004509 ]

(E)-(25S)-23-Acetyl-5-furost-22-ene-3,26-diol

M.-G. Hernández Linares, J. Sandoval Ramírez, S. Meza Reyes, S. Montiel Smith and S. Bernès

Abstract: The title steroid, C₂₉H₄₆O₄, is a furostene derivative with a C=C double-bond length of 1.353 (3) Å and an E configuration. The side chain is oriented toward the face of the A-E steroidal nucleus and presents a disordered terminal CH₂-OH group [occupancies for resolved sites are 0.591 (9) and 0.409 (9)]. The methyl group at C20 attached to ring E is also oriented toward the face, avoiding steric hindrance with the carbonyl O atom of the acetyl group. The furostene and acetyl functionalities form an ,-unsaturated ketone system, with an s-cis configuration. All hydroxy and carbonyl groups are involved in weak intermolecular hydrogen bonds. The absolute configuration was assigned from the synthesis.

Online 22 February 2008

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