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  • 1
    Electronic Resource
    Electronic Resource
    TheO, O′-dibenzoyl derivative of (R, R)-tartaric acid as a host compound for simple organic ethers (1995)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 22 (1995), S. 211-219 
    Details
    ISSN: 1573-1111
    Keywords: (R, R)-Tartaric acid derivatives ; host-guest compounds ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract TheO, O′-dibenzoyl derivative of (R, R)-tartaric acid shows a good inclusion ability for diethyl and di-n-propol ethers. The two crystalline inclusion compounds have 1:1 stoichiometry and reveal isomorphous structures. Hydrogen bonded host molecules form chains running along thez axis of the unit cell and guest molecules join to these chains by short O−H...O hydrogen bonds. Hydrogen bonding in the crystals is characterized by a C(7)D first-order network. The ether molecules are in a fully extended conformation. They are accommodated in channel-like voids running along thex axis. Atomic displacement parameters are significantly larger for diethyl ether than for the di-n-propyl ether molecule reflecting less dense packing for this inclusion compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00707084
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of salograviolide A, a guaiane-type sesquiterpene lactone (1992)
    Springer
    Journal of chemical crystallography 22 (1992), S. 659-663 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new naturally occurring sesquiterpene lactone, 3β-acetoxy-8α, 9β-dihydroxy-1αH, 5αH, 6βH, 7αH-guaian-4(15), 10(14), 11(13)-trien-6,12-olide (Scheme 1) has been structurally characterized by X-ray diffraction methods. The compound crystallizes in the monoclinic space groupP21 with two molecules in the unit cell of dimensionsa=8.485(2),b=7.398(1),c=12.919(3) Å,β=98.17(3)°. The structure has been refined to a final value ofR of 0.039 for 2091 observed reflections. The molecule possesses a polyunsaturated guaianolide system which contains a twist chair exomethylenecycloheptane moiety,cis-fused with the exomethylene-cyclopentane [at C(1) and C(5)] andtrans-annelated with theα-exomethylene-γ-lactone at C(6) and C(7). The acetoxy substituent at C(3) isβ-oriented andtrans to the C(8) hydroxyl which, in turn, istrans to the neighboring C(9) hydroxyl. Substitution at C(9) is unprecedented among guaianolides isolated fromCentaureinae subtribe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160982
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  • 3
    Electronic Resource
    Electronic Resource
    Unusual solid-state conformation of D-glucitol hexa(p-chlorobenzoate) (1992)
    Springer
    Journal of chemical crystallography 22 (1992), S. 353-359 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The carbon atom chain in the molecule ofd-glucitol hexa (p-chlorobenzoate) adopts a planar, zigzag conformation in the solid state, as determined by X-ray crystallography. The preference for such conformation in the crystal can be ascribed to the stacking interactions in which an infinite number of p-chlorobenzoyloxy substituents is involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01199539
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