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  • 1
    Electronic Resource
    Electronic Resource
    X-ray diffraction structure of the phosphido-bridged mixed-metal cluster Fe2(CO)6(μ3-PPh)2Pt(dppe) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 233-236 
    Details
    ISSN: 1572-8854
    Keywords: Mixed-metal clusters ; phosphido-bridged clusters ; X-ray structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Treatment of Fe2(CO)6(μ2-PPhH)2 with BuLi (2 equiv.), followed by the addition of PtCl2 (dppe), affords the phosphido-bridged cluster Fe2(CO)6(μ3-PPh)2Pt(dppe). The Fe2Pt cluster was isolated and characterized in solution by IR and 31P NMR spectroscopy, and the molecular structure of Fe2(CO)6(μ3-PPh)2Pt(dppe) determined by X-ray diffraction analysis. Fe2(CO)6(μ3-PPh)2Pt(dppe) crystallizes in the orthorhombic space group Pbca, a = 17.539(3) Å, b = 21.490(2) Å, c = 22.959(3) Å, V = 8653.5(18) Å3, Z = 8, dcalc = 1.670 g cm−3; R = 0.0644, Rw = 0.0389 for 5040 observed reflections with I 〉 3σ(I).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009586921599
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  • 2
    Electronic Resource
    Electronic Resource
    One-Pot Synthesis of Cage-Functionalized, Ketal-Containing Crown Ethers (2000)
    Springer
    Structural chemistry 11 (2000), S. 257-260 
    Details
    ISSN: 1572-9001
    Keywords: Crown ethers ; X-ray structure ; molecular mechanics calculations ; alkali metal picrate extraction ; host–guest chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Acid-catalyzed reaction of pentacyclo[5.4.0.02,6.03,10.05.9]undecane-8,11-dione (1) with penta(ethylene glycol) produced two cage-functionalized, ketal-containing crown ethers, i.e., 2 and 3, in low yield. The structure of 2 was established unequivocally by direct methods. Alkali metal picrate extraction data obtained for 2 and for a structurally related model compound, i.e., 18-crown-6,indicate that 2 is an inefficient alkali metal picrate extracting agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009266310897
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  • 3
    Electronic Resource
    Electronic Resource
    A conformational investigation of zearalenone and the 6′-zearalenols by carbon and proton NMR spectroscopy (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 975-980 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; 13C NMR ; Zearalenone α-zearalenol ; β-zearalenol ; Conformation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The carbon and proton spectra for zearalenone and its two C-6′ alcohol derivatives have been assigned using 2D techniques along with NOE difference spectra and the LIS of the dimethoxy derivative of the β-alcohol. Low temperature and relaxation time studies on the latter compound support the existence of only one solution conformer for each molecule. Molecular mechanics calculations for each molecule predict the existence of several low energy conformers which differ in energy by less than 3 kcal/mol; however, barriers to conformational interchange could not be estimated. Partial analysis of the proton spectra allows a comparison of the NMR parameters with the MM derived conformations and with x-ray structural data. The solution conformations of zearalenone and α-zearalenol are closely related to the solid state conformations.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260251110
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