Abstract
The title compound, C19H18O3, crystallizes with three molecules (A, B and C) in the asymmetric unit. The carbonyl O atom shows positional disorder over two sites in molecules A and B; the site-occupancy ratios are 0.76 (3):0.24 (3) and 0.86 (3):0.14 (3), respectively. The ethylene fragments in each molecule have an E conformation, while the C—O—C—C torsion angles indicate near planarity. The dihedral angles formed by the aromatic rings are 20.0 (1), 23.7 (1) and 16.1 (1)° for molecules A, B and C, respectively. Intramolecular C—H⋯O hydrogen bonds occur in each molecule.
Highlights
The title compound, C19H18O3, crystallizes with three molecules (A, B and C) in the asymmetric unit
The ethylene fragments in each molecule have an E conformation, while the C—O—C—C torsion angles indicate near planarity
The dihedral angles formed by the aromatic rings are 20.0 (1), 23.7 (1) and 16.1 (1) for molecules A, B and C, respectively
Summary
Gnanavelu Ganesh,a Santhanagopalan Purushothaman,b Piskala Subburaman Kannan,a Raghavachary Raghunathanb and Arunachalathevar SubbiahPandic*. Key indicators: single-crystal X-ray study; T = 293 K; mean (C–C) = 0.003 A; disorder in main residue; R factor = 0.045; wR factor = 0.143; data-to-parameter ratio = 15.8. The carbonyl O atom shows positional disorder over two sites in molecules A and B; the site-occupancy ratios are 0.76 (3):0.24 (3) and 0.86 (3):0.14 (3), respectively. The dihedral angles formed by the aromatic rings are 20.0 (1), 23.7 (1) and 16.1 (1) for molecules A, B and C, respectively. Related literature For the biological activities of chalcones, see: Xue et al (2004); Lee et al (2006); Bhat et al (2005); Satyanarayana et al (2004). For a related crown ether structure, see: Anh et al (2011).
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