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. 2013 Mar 28;69(Pt 4):o616-7.
doi: 10.1107/S1600536813007952. Print 2013 Apr 1.

9-(2-Hy-droxy-6-oxocyclo-hex-1-en-1-yl)-2,3,4,9-tetra-hydro-1H-xanthen-1-one

Shaaban K Mohamed  1 , Mehmet Akkurt, Antar A Abdelhamid, Aamer Saeed, Ulrich Flörke
Affiliations

9-(2-Hy-droxy-6-oxocyclo-hex-1-en-1-yl)-2,3,4,9-tetra-hydro-1H-xanthen-1-one

Shaaban K Mohamed et al. Acta Crystallogr Sect E Struct Rep Online. .

Abstract

In the xanthene ring system in the title compound, C19H18O4, the 4H-pyran ring has a maximum deviation of 0.110 (2) Å from planarity and the cyclo-hexene ring exhibits a puckered conformation [puckering parameters Q T = 0.452 (3) Å, θ = 57.0 (4) and ϕ = 131.7 (4)°]. The cyclo-hexene ring attached to the xanthene system adopts an envelope conformation, with the middle of the three methylene C atoms as the flap atom. In the crystal, O-H⋯O and C-H⋯O hydrogen bonds form infinite chains of R 1 (2)(6) ring motifs along [100] with the xanthene groups arranged in an alternating zigzag manner.

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Figures

Fig. 1.
Fig. 1.
Molecular structure of title compound. Displacement ellipsoids are drawn at the 50% probability level.
Fig. 2.
Fig. 2.
The intermolecular hydrogen bonds in (I) indicated as dashed lines along [001]. H-atoms not involved in hydrogen bonding are omitted.
See this image and copyright information in PMC

References

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