Acta Cryst. (2009). E65, o312-o313  [ doi:10.1107/S1600536809001020 ]

Dimethyl 2,2'-[(4-oxo-2-phenyl-4H-chromene-5,7-diyl)dioxy]diacetate: a more densely packed polymorph

A. Nallasivam, M. Nethaji, N. Vembu, B. Jaswant and N. Sulochana

Abstract: The title molecule, C₂₁H₁₈O₈, crystallizes in two crystal polymorphs, see also Nallasivam, Nethaji, Vembu & Jaswant [Acta Cryst. (2009), E65, o314-o315]. The molecules of both polymorphs differ by the conformation of the oxomethylacetate groups. The title molecules are rather planar compared to the molecules of the other polymorph. In the title molecule, one of the oxomethylacetate groups is disordered (occupancies of 0.6058/0.3942). The structures of both polymorphs are stabilized by C-HO and C-H interactions. Due to the planarity of the title molecules and similar intermolecular interactions, the title molecules are more densely packed than those of the other polymorph.

Online 14 January 2009

Copyright © International Union of Crystallography
IUCr Webmaster