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

Date Published: July 01, 2011

Publisher: International Union of Crystallography

Author(s): Sayed Hasan Mehdi, Othman Sulaiman, Raza Murad Ghalib, Chin Sing Yeap, Hoong-Kun Fun.


The asymmetric unit of the title xanthene compound, C25H30O5, contains two mol­ecules in which the pyran ring and the dimeth­oxy­phenyl ring are nearly perpendicular to one another [dihedral angles = 86.81 (8) and 84.45 (9)°]. One of the meth­oxy groups in one mol­ecule is twisted away from the phenyl ring [C—O—C—C torsion angle = −103.40 (16)°]. The pyran ring adopts a boat conformation whereas the two fused cyclo­hexane rings adopt envelope conformations in both mol­ecules. In the crystal, mol­ecules are linked into a three-dimensional network by C—H⋯O hydrogen bonds.

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For applications of xanthene derivatives, see: Lambert et al. (1997 ▶); Hideo (1981 ▶); Poupelin et al. (1978 ▶); Menchen et al. (2003 ▶); Banerjee & Mukherjee (1981 ▶); Ravindranath & Seshadri (1973) ▶. For the synthesis of xanthene and 1,8-dioxoocta­hydroxanthene derivatives with or without the use of a catalyst, see: Fan et al. (2005 ▶); Jin et al. (2005 ▶); Srihari et al. (2008 ▶). For a related structure, see: Mehdi et al. (2011 ▶). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 ▶). For ring conformations, see: Cremer & Pople (1975 ▶).




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