[Open access]

[Contents scheme]

Acta Cryst. (2013). E69, o442
[ doi:10.1107/S1600536813000299 ]

(3E)-11,16-Dioxatricyclo[15.4.0.05,10]henicosa-1(21),3,5,7,9,17,19-heptaen-2-one

G. Ganesh, S. Purushothaman, P. S. Kannan, R. Raghunathan and A. SubbiahPandi

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.


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