Acta Crystallogr Sect E Struct Rep Online 2011 Sep 11;67(Pt 9):o2301. Epub 2011 Aug 11.
The reaction of 5,6-(2,2-dimethyl-chromane)-2-hy-droxy-4-meth-oxy-acetophenone and 3,4-methlene-dioxy-benzaldehyde affords the title chalcone derivative, C(22)H(22)O(6). The two benzene rings are connected through a -C(=O)-CH=CH- (propenone) unit, which is in an E conformation; the ring with the hy-droxy substitutent is aligned at 6.2 (1)° with respect to this unit, whereas the ring with the methyl-enedi-oxy substituent is aligned at 8.2 (1)°. The dihdral angle between the rings is 14.32 (7)°. The hy-droxy group engages in an intra-molecular hydrogen bond with the carbonyl O atom of the propenone unit, generating an S(5) ring.