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  • [ X ]
    Öğe
    Crystal structure of 3,4a, 7,7,10a-pentamethyl-3-vinyldodecahydro-1H-benzo[f]chromen-9-ol isolated from Sideritis perfoliata
    (Int Union Crystallography, 2016) Celik, Ismail; Ersanli, Cem Cuneyt; Koseoglu, Rahmi; Aksit, Huseyin; Erenler, Ramazan; Demirtas, Ibrahim; Akkurt, Mehmet
    The asymmetric unit of the title compound, C20H34O2, contains two crystallographically independent molecules (1 and 2) with similar conformations. In both molecules, the cyclohexane rings adopt a chair conformation, while the oxane rings are also puckered. In the crystal, O-H center dot center dot center dot O hydrogen bonds connect adjacent molecules, forming C(6) helical chains located around a 21 screw axis and running along the crystallographic a axis. The packing of these chains is governed only by van der Waals interactions. Semi-empirical PM3 quantum chemical calculations are in a satisfactory agreement with the structural results of the X-ray structure analysis. The absolute structure was indeterminate in the present experiment.
  • [ X ]
    Öğe
    Crystal structure of racemic [(1R,2S,3R,4S,6S)-2,6-bis(furan-2-yl)-4-hydroxy-4-(thiophen-2-yl)cyclohexane-1,3-diyl]bis(thiophen-2-ylmethanone)
    (Int Union Crystallography, 2016) Celik, Ismail; Ersanli, Cem Cuneyt; Akkurt, Mehmet; Gezegen, Hayrettin; Koseoglu, Rahmi
    In the title compound, C28H22O5S3, the central cyclohexane ring adopts a chair conformation. The atoms of the furan ring attached to the 6-position of the central cyclohexane ring are disordered over two sets of sites with occupancies of 0.832 (5) and 0.168 (5). The hydroxy group is disordered over two positions (at the 4- and 6-positions of the cyclohexane ring) in the ratio 0.832 (5): 0.168 (5). In the crystal, molecules are linked by C-H center dot center dot center dot O hydrogen bonds and C-H center dot center dot center dot pi interactions, forming layers parallel to (100).
  • [ X ]
    Öğe
    Crystal structure of racemic [(1R,2S,3R,4S,6S)-2,6-bis(furan-2-yl)-4-hydroxy-4-(thiophen-2-yl)cyclohexane-1,3-diyl]bis(thiophen-2-ylmethanone) (vol E72, pg 976, 2016)
    (Int Union Crystallography, 2016) Celik, Ismail; Ersanli, Cem Cuneyt; Akkurt, Mehmet; Gezegen, Hayreddin; Koseoglu, Rahmi
    [No abstract available]