Ee, Gwendoline Cheng Lian and Mohamed Tahir, Mohamed Ibrahim and Silong, Sidik and Wei, Chung Sim and Huey, Chong Kwong (2010) 1,3,6-Trihydroxy-7-methoxy-2,8-bis(3-methylbut-2-enyl)-9H-xanthen-9-one. Acta Crystallographica Section E: Structure Reports Online, 66 (12). pp. 3362-3363. ISSN 1600-5368
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Official URL: http://dx.doi.org/10.1107/S1600536810049123
The title compound (trivial name α-mangostin), C24H26O6, isolated from Cratoxylum glaucum, is characterized by a xanthone skeleton of three fused six-membered rings and two 3-methylbut-2-enyl side chains. The three rings in the structure are nearly coplanar, with an r.m.s. deviation for the tricyclic ring system of 0.0014 Å. The two 3-methylbut-2-enyl side chains are in (+)-synclinal and (-)-anticlinal conformations. Intramolecular O—H[cdots, three dots, centered]O and C—H[cdots, three dots, centered]O interactions occur. The crystal structure is stabilized by intermolecular O—H[cdots, three dots, centered]O, C—H[cdots, three dots, centered]O and C—H[cdots, three dots, centered]π interactions.
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