Abstract
In the title xanthone derivative [systematic name: 9-hydroxy-5,10-dimethoxy-2,2-dimethyl-11-(3-methylbut-2-en-1-yl)-2,3,4,12-tetrahydro-1,7-dioxatetraphen-12-one], C25H28O6, the xanthone ring system is roughly planar, with an r.m.s. deviation of 0.1038 (1) Å. The chromane ring is in a half-chair conformation and the 3-methylbut-2-enyl substituent is axially attached with an (+)-anticlinal conformation. Two weak intramolecular C—H⋯O interactions generate two S(6) ring motifs. In the crystal, molecules are linked into ribbons along the c axis by O—H⋯O and weak C—H⋯O hydrogen bonds. A π–π interaction, with a centroid–centroid distance of 3.5413 (8) Å, is also observed.
Highlights
Crystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and bX-ray
The chromane ring is in a half-chair conformation and the 3-methylbut-2-enyl substituent is axially attached with an (+)-anticlinal conformation
For the stability of the temperature controller used in the data collection, see Cosier & Glazer (1986)
Summary
Crystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and bX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia R factor = 0.046; wR factor = 0.134; data-to-parameter ratio = 19.7.
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