%0 Journal Article
%T (E)-(25S)-23-Acetyl-5¦Â-furost-22-ene-3¦Â,26-diol
%A Mar¨ªa-Guadalupe Hern¨¢ndez Linares
%A Jes¨²s Sandoval Ram¨ªrez
%A Socorro Meza Reyes
%A Sara Montiel Smith
%J Acta Crystallographica Section E
%D 2008
%I International Union of Crystallography
%R 10.1107/s1600536808004509
%X The title steroid, C29H46O4, is a furostene derivative with a C=C double-bond length of 1.353 (3)   and an E configuration. The side chain is oriented toward the ¦Á face of the A¨CE steroidal nucleus and presents a disordered terminal CH2¡ªOH 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 ¦Á face, avoiding steric hindrance with the carbonyl O atom of the acetyl group. The furostene and acetyl functionalities form an ¦Á,¦Â-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.
%U http://scripts.iucr.org/cgi-bin/paper?S1600536808004509