Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 4 (April 2013)

organic compounds

Acta Cryst. (2013). E69, o500    [ doi:10.1107/S1600536813005291 ]

Diethyl 1,8-bis­(4-methyl­phen­yl)-11-oxatricyclo­[,7]undeca-2,4,6-triene-9,10-dicarboxyl­ate

B. Balakrishnan, M. Nandakumar, P. R. Seshadri and A. K. Mohanakrishnan

Abstract: The title compound, C30H30O5, is the Diels-Alder adduct from 1,3-diphenyl­benzo[c]furan and diethyl maleate. The mol­ecule comprises a fused tricyclic system containing two five-membered rings, which are in envelope conformations with the O atom at the flap, and a six-membered ring adopting a boat conformation. The dihedral angle between the 4-methyl­phenyl substituents in the 1- and 8-positions is 62.1 (1)°. The ethyl group of one ester group and the eth­oxy group of the other ester group are disordered over two sets of sites, with occupancy ratios of 0.43 (2):0.57 (2) and 0.804 (7):0.196 (7), respectively. In the crystal, inversion dimers are formed through pairs of C-H...O inter­actions.

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