9-(2,4-Di-fluoro-phen-yl)-3,3,6,6-tetra-methyl-3,4,5,6,7,9-hexa-hydro-2H-xanthene-1,8-dione.
In the title compound, C23H24F2O3, the central pyran ring has a flat-boat conformation, whereas the two fused cyclo-hexenone rings adopt envelope conformations, with the C atom bearing the dimethyl substituent being the flap atom in each case. The pyran ring mean plane and the di-fluoro-phenyl ring are almost normal to each other, making a dihedral angle of 87.55 (4)°. In the crystal, mol-ecules are linked by pairs of C-H⋯O hydrogen bonds, forming inversion dimers with an R 2 (2)(8) ring motif. The F atom at position 2 on the di-fluoro-phenyl ring is disordered over the 2- and 6-positions, and has a refined occupancy ratio of 0.932 (3):0.068 (3).
Department of Physics, Seethalakshmi Ramaswami College (Autonomous), Tiruchirappalli 620 002, India.
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Rizwana Begum
Department of Physics, K. Ramakrishnan College of Engineering, Samayapuram, Tiruchirappalli 621 112, India.
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Hema
Department of Chemistry, Sri Krishna Engineering College, Panapakkam, Thambaram 601 301, India.
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Sumathi
Department of Chemistry, Chemistry Wing DDE, Annamalai University, Annamalainagar 608 002, India.
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Valliappan
Department of Chemistry, S.K.P. Engineering College, Thiruvanamalai 606 611, India.
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Srinivasan