Structure Reports Online

Volume 65, Part 4 (April 2009)

organic compounds

Acta Cryst. (2009). E65, o893-o894 [ doi:10.1107/S1600536809010496 ]

(E)-1-(4-Bromophenyl)-3-(2,4,6-trimethoxyphenyl)prop-2-en-1-one

S. Chantrapromma, T. Suwunwong, C. Karalai and H.-K. Fun

Abstract: The molecule of the title chalcone derivative, C₁₈H₁₇BrO₄, is twisted, the dihedral angle between the 4-bromophenyl and 2,4,6-trimethoxyphenyl rings being 39.17 (6)°. The three methoxy groups are oriented in two different conformations whereby two methoxy groups are coplanar, whereas the third is twisted with respect to the attached benzene ring [C-O-C-C torsion angles of -2.84 (18), -2.80 (18) and -9.31 (18)°]. Weak intramolecular C-HO interactions generate two S(5) and one S(6) ring motifs. In the crystal structure, molecules are linked into supramolecular sheets parallel to the bc plane by weak C-HO interactions. These sheets are stacked along the a axis. The crystal structure is further stabilized by weak C-H [pi] interactions.