Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 3 (March 2013)

organic compounds

Acta Cryst. (2013). E69, o323    [ doi:10.1107/S1600536813002791 ]

Diethyl 1,8-diphenyl-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, C28H26O5, is the Diels-Alder adduct from 1,3-diphenyl­benzo[c]furan and diethyl maleate. The mol­ecule comprises of 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 phenyl substituents in the 1,8-positions is 55.1 (1)°. The ethyl groups are disordered over two sets of sites, with occupancy ratios of 0.648 (9):0.352 (9) and 0.816 (1):0.184 (1). In the crystal, pairs of C-H...[pi] inter­actions link the mol­ecules into inversion dimers.

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