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

作者：Nallasivam Angannan; Nethaji Munirathinam; Vembu Nagarajan^*; Jaswant Buckle; Sulochana Nagarajan

来源：Acta Crystallographica Section E-Structure Reports Online, 2009, 65(2): O312-O313.

DOI：10.1107/S1600536809001020

The title molecule, C(21)H(18)O(8), 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-H center dot center dot center dot O and C-H center dot center dot center dot pi 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.

• 出版日期2009-2