Acta Cryst. (2009). E65, o1294-o1295  [ doi:10.1107/S1600536809017334 ]

7,7',8,8'-Tetramethoxy-4,4'-dimethyl-3,3'-bicoumarin

H.-K. Fun, S. R. Jebas, M. Parveen, Z. Khanam and R. M. Ghalib

Abstract: In the crystal structure, the title compound, C₂₄H₂₂O₈, lies on a twofold rotation axis and the asymmetric unit comprises one half-molecule. The dihedral angle formed by the coumarin unit with the symmetry-related part is 74.78 (14)°. One of the methoxy groups attached to the coumarin unit is considerably twisted, making an angle of 87.17 (17)° with respect to the coumarin unit; the other is twisted by 0.66 (19)°. No classical hydrogen bonds are found in the sturcture; only a weak C-H interaction and short intramolecular OO contacts [2.683 (2)-2.701 (2) Å] are observed.

Online 14 May 2009

Copyright © International Union of Crystallography
IUCr Webmaster