12-(3,4,5-Trimethoxyphenyl)-2,3,4,12-tetrahydro-1H-5-oxatetraphen-1-one: crystal structure and Hirshfeld surface analysis

• Main Authors: Jotani, Mukesh M., Iniyavan, P., Vijayakumar, V., Sarveswari, S., Tan, Yee Seng *, Tiekink, Edward R. T. *
• Format: Article
• Language: English
• Published: International Union of Crystallography 2016
• Subjects: QD Chemistry
• Online Access: http://eprints.sunway.edu.my/643/1/Acta%20E_RC%202016%2072%20809.pdf; http://eprints.sunway.edu.my/643/; http://dx.doi.org/10.1107/S2056989016007775
• Institution: Sunway University

In the title compound, C26H24O5, the pyran ring has a flattened-boat con­formation, with the 1,4-related ether O and methine C atoms lying 0.1205 (18) and 0.271 (2) Å, respectively, above the least-squares plane involving the doubly bonded C atoms (r.m.s deviation = 0.0208 Å). An envelope conformation is found for the cyclo­hexene ring, with the flap atom being the middle methyl­ene C atom, lying 0.616 (2) Å out of the plane defined by the remaining atoms (r.m.s. deviation = 0.0173 Å). The fused four-ring system is approximately planar, with the dihedral angle between the least-squares planes through the cyclo­hexene and naphthyl rings being 10.78 (7)°. The tris­ubstituted benzene ring occupies a position almost perpendicular to the pyran ring [dihedral angle = 83.97 (4)°]. The most prominent feature of the packing is the formation of zigzag supra­molecular chains mediated by aryl-C-H...O(meth­oxy) inter­actions; chains are connected into a three-dimensional architecture by methyl­ene- and methyl-C-H...[pi] inter­actions. The prevalence of C-H...O and C-H...[pi] inter­actions is confirmed by an analysis of the Hirshfeld surface. A comparison with related structures suggests that the mol­ecular conformation of the title compound is relatively robust with respect to varying substitution patterns at the methine C atom of the pyran ring.