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The title compound, 1,1′,8,8′-tetra­methoxy-9,9′-bianthracene-10,10′(9 H,9′H)-dione, C32H26O6, was obtained by the reduction of 1,8-di­methoxy­anthra­quinone with sodium borohydride and tri­fluoro­acetic acid. In the anthrone dimers, the methoxy and carbonyl groups are attached to opposite sides of the anthracene rings. In the solid state, the mol­ecule has a crystallographically imposed centre of symmetry located at the mid-point of the C—C bond linking the two anthracene systems. [ABSTRACT FROM AUTHOR]

In the title compound, C12H7N5O8, the dihedral angle between the two benzene rings is 56.3 (2)°. The crystal packing is stabilized by intramolecular N—H...O and intermolecular C—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C28H32N4O6, crystallizes with one half-molecule in the asymmetric unit and the other half generated by an inversion centre. The compound has a crown structure and is an important intermediate for the synthesis of biologically active 1,7-dioxa-4,10-diazacyclododecane derivatives. Intermolecular π–π stacking interactions, with a perpendicular distance of 3.57 Å, involving the planar phthalimide groups and weak C—H...O hydrogen bonds are present. [ABSTRACT FROM AUTHOR]

In the title compound, [Ca2(C36H36N24O12)(H2O)10][ZnCl4]2·7H2O, each cucurbit[6]uril molecule is coordinated to two calcium cations as a tetradentate ligand. Each calcium cation is coordinated by two neighboring carbonyl O atoms at a portal of the same cage. Heptacoordination of the calcium cation is completed with five water molecules. The transition-metal salt anion [ZnCl4]2− acts as a counter-ion. The cation is centrosymmetric. The crystal structure involves O—H...O and O—H...Cl hydrogen bonds. One of the water molecules is disordered, with an occupancy of 0.5. [ABSTRACT FROM AUTHOR]