organic compounds
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The title compound, C7H6OS, crystallizes with two similar molecules, 1 and 2, in the asymmetric unit. Both molecules are essentially planar with r.m.s. deviations of 0.0193 and 0.0107 Å for the planes through the nine non-H atoms of molecules 1 and 2, respectively. The thiophene and 4,5-dihydrocyclopentadienone rings are inclined at 2.40 (13)° in 1 and 0.64 (13)° in 2. In the crystal structure π–π [3.6542 (17) Å] and C—Hπ contacts stack the molecules into columns in an inverse fashion along the b axis. An extensive series of C—HO hydrogen bonds links the columns, generating an extended network structure.
organic compounds
Open access
The title molecule, C14H14O4, lies on a twofold rotation axis that bisects the central benzene ring, with only one half-molecule in the asymmetric unit. The pyranone systems adopt distorted twist- boat conformations, with the two methylene C atoms displaced by 0.537 (1) and 0.163 (2) Å from the best-fit plane through the remaining five C and O atoms (r.m.s. deviation = 0.073 Å). In the crystal, bifurcated C—H(O,O) hydrogen bonds link pairs of adjacent molecules in an obverse fashion, stacking molecules along c. These contacts are further stabilized by very weak π–π interactions between adjacent benzene rings with centroid–centroid distances of 4.1951 (4) Å. Additional C—HO contacts link these stacks, giving a three-dimensional network.
organic compounds
Open access
The title compound, C11H12O3, is essentially planar, with an r.m.s. deviation of 0.179 Å from the mean plane through the 14 non-H atoms in the molecule. The benzene ring and the pyranone mean plane are inclined at 13.12 (6)° to one another and the pyranone ring adopts a flattened chair conformation. In the crystal, O—HO hydrogen bonds and C—HO contacts form R12(6) rings and link molecules into chains along b. Additional C—HO contacts generate inversion dimers, with R22(8) ring motifs, and form sheets parallel to (-102) which are linked by C—Hπ interactions.