Research Article: 9-(4-Hy­droxy-3,5-dimeth­oxy­phen­yl)-3,3,6,6-tetra­methyl-3,4,5,6,7,9-hexa­hydro-1H-xanthene-1,8(2H)-dione

Date Published: April 01, 2012

Publisher: International Union of Crystallography

Author(s): V. Sughanya, N. Sureshbabu.


In the title compound, C25H30O6, the two fused cyclo­hexa­none rings have envelope conformations, whereas the central pyran ring is roughly planar [mximum deviation = 0.045 (2) Å]. The pyran and benzene rings are almost perpendicular to each other, making a dihedral angle of 86.32 (2)°. In the crystal, molecules are linked via pairs of O—H⋯O hydrogen bonds, forming inversion dimers.

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For the synthesis of xanthenes, see: Vang & Stankevich (1960 ▶); Hilderbrand & Weissleder (2007 ▶). For their pharmaceutical properties, see: Lambert et al. (1997 ▶); Poupelin et al. (1978 ▶); Hideo (1981 ▶); Selvanayagam et al. (1996 ▶); Jonathan et al. (1988 ▶). For related structures, see Mehdi et al. (2011 ▶); Odabasoglu et al. (2008 ▶). For the assignment of ring conformations, see: Cremer & Pople (1975 ▶).