Acta Cryst. (2005). E61, o169-o171  [ doi:10.1107/S160053680403363X ]

3-Methoxy-19-norpentara-1,3,5(10),17(20)-tetraen-21-one

M. Watanabe, T. Matsumoto, S. Mataka and T. Thiemann

Abstract: In the title compound, alternatively called 3'-oxocyclohex-1'-eno-1',6':16,17-3-O-methylestra-1,3,5(10),16(16H)-tetraen-3-ol, C₂₃H₂₈O₂, the cyclohexenone ring is fused to the five-membered ring through the position at C16. As a result of the ring annelation, the distance between carbonyl and methoxy O atoms [12.994  (2)  Å] is much longer than that in estrones or estradiol. The crystal packing is stabilized by C-HO and C-H hydrogen-bonding interactions.

Online 24 December 2004

Copyright © International Union of Crystallography
IUCr Webmaster