Acta Crystallographica Section E

Volume 67, Part 10 (October 2011)


organic compounds



su2302 scheme

Acta Cryst. (2011). E67, o2607-o2608    [ doi:10.1107/S1600536811036294 ]

Caloxanthone C: a pyranoxanthone from the stem bark of Calophyllum soulattri

G. C. L. Ee, S. H. Mah, H. C. Kwong, S. S. Teh, M. I. Mohamed Tahir and S. Silong

Abstract: The title compound [systematic name: 5,10-dihydroxy-2,2-dimethyl-12-(2-methylbut-3-en-2-yl)pyrano[3,2-b]xanthen-6(2H)-one], C23H22O5, isolated from the stem bark of Calophyllum soulattri, consists of four six-membered rings and a 2-methylbut-3-en-2-yl side chain. The tricyclic xanthone ring system is almost planar [maximum deviation = 0.093 (2) Å], whereas the pyranoid ring is in a distorted boat conformation. The 2-methylbut-3-en-2-yl side chain is in a synperiplanar conformation. There are two intramolecular O-H...O hydrogen bonds. In the crystal, molecules are linked by C-H...O interactions, forming a zigzag chain propagating in [010].


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