Caloxanthone C: a pyranoxanthone from the stem bark of Calophyllum soulattri.
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 sy...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
International Union of Crystallography
2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/24933/1/Caloxanthone%20C.pdf |
| Summary: | 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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