Received 9 October 2013
aDepartment of Studies in Chemistry, Mangalore University, Mangalagangotri 574 199, India,bDepartment of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India,cDepartment of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA, and dDepartment of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
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The asymmetric unit of the title compound, C21H18ClFO3, contains two independent molecules. In one molecule (A), the 4-chlorophenyl, oxocyclohex-3-ene, carboxylate, and ethyl groups were refined as disordered over two sets of sites with a 0.684 (5):0.316 (5) ratio. The cyclohexene ring in the disordered molecule is in a slightly distorted envelope conformation for the major component (with the C atom bound to the carboxylate group being the flap atom) and in a screw-boat conformation for the minor component. In the ordered molecule (B), the cyclohexene ring is in a half-chair conformation. The dihedral angles between the mean planes of the fluoro- and chloro-substituted benzene rings are 89.9 (7) (only the major component is considered for A) and 76.4 (7)° (B). In the crystal, inversion dimers are observed along with weak C-HO hydrogen bonds, which form chains along .
For the synthesis and applications of 4,6-diaryl-2-oxo-cyclohex-3-ene-1-carboxylate derivatives, see: Ashalatha et al. (2009); Sreevidya et al. (2010); Padmavathi et al. (2000); Senguttuvan & Nagarajan (2010); Butcher et al. (2011). For puckering parameters, see: Cremer & Pople (1975). For standard bond lengths, see Allen et al. (1987). For related structures, see: Dutkiewicz et al. (2011a,b,c); Fun et al. (2010); Harrison et al. (2010); Kant et al. (2012).
Data collection: CrysAlis PRO (Agilent, 2012); cell refinement: CrysAlis PRO; data reduction: CrysAlis RED (Agilent, 2012); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH5662 ).
BN thanks the UGC for financial assistance through a BSR one-time grant for the purchase of chemicals. MS thanks the DST for providing financial help for the research work through an INSPIRE Fellowship. RJB acknowledges the NSF-MRI program (grant No. CHE-0619278) for funds to purchase the X-ray diffractometer.
Agilent (2012). CrysAlis PRO and CrysAlis RED. Agilent Technologies, Yarnton, Oxfordshire, England.
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