Two constitutionally isomeric 9,10-anthraquinonecarboxylic acids 1 and 2 are reported to yield DMSO-solvated crystals (1a and 2a) on the crystallization from DMSO. The molecular and crystal structures are described and comparatively discussed with reference to the effect implicated by the different position of the carboxylic group at the anthraquinone basis and the involvement of the solvent molecule.\ud
Anthraquinonecarboxylic acids-DMSO solvates-X-ray analysis-Hydrogen bonding-π-Stacking interactio
In the title compound (systematic name: 17-formyl-2,5,8,11,14-pentaoxabicyclo[13.4.0]nonadeca-15,17,19-triene), C15H20O6, the 15-crown-5 ring adopts a twisted conformation. The formyl group is coplanar with the benzene ring. The crystal packing is stabilized by C—H⋯O interactions involving the C=O group and ether O atoms as acceptors and methylene CH groups as donors.
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