Date Published: February 01, 2012
Publisher: International Union of Crystallography
Author(s): Mohammad M. Mojtahedi, Werner Massa, M. Saeed Abaee, A. Wahid Mesbah.
The title compound, C22H22O5, crystallizes with two independent molecules in the asymmetric unit, both of which possess pseudo-Cs symmetry. The central 1,3-dioxanone rings have envelope conformations, with the C atom bearing the two methyl groups at the flap. The benzene rings of the methoxybenzylidene units, attached in the 4- and 6-positions on the central 1,3-dioxanone rings, are tilted in the same direction with dihedral angles varying between 8.2 (1) and 18.1 (1)°. The crystal packing is influenced by π-stacking interactions of the parallel displaced type [centroid–centroid distance of 3.723 (1) Å for molecule 1 and 3.884 (1) Å for molecule 2, with ring slippages of 1.432 and 1.613 Å, respectively] and the T-shaped type, with the long molecular axes all aligned along .
For the synthesis of bisarylidenes of hetero- and homocyclic ketones, see: Abaee et al. (2008a ▶,b ▶). For the crystal structures of similar compounds, see: Abaee et al. (2012 ▶); Nesterov et al. (2011 ▶); Shahani et al. (2010 ▶). For details concerning π-stacking interactions, see: Hunter & Sanders (1990 ▶).