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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.

ABSTRACT: 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).

SUBMITTER: Rizwana Begum S 

PROVIDER: S-EPMC3998450 | biostudies-other | 2014 Mar

REPOSITORIES: biostudies-other

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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.

Rizwana Begum S S   Hema R R   Sumathi G G   Valliappan R R   Srinivasan N N  

Acta crystallographica. Section E, Structure reports online 20140212 Pt 3

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.  ...[more]

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