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  • Artikel: DFG Deutsche Nationallizenzen  (4)
  • 1995-1999  (1)
  • 1980-1984  (3)
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  • Artikel: DFG Deutsche Nationallizenzen  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    The structure of dibenz[b,f]oxepin (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 200-203 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740882002374
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Conformation and packing differences between two anomeric xylofuranosyl uracil nucleosides: Crystal structure of α-C14N2O7H18 monohydrate (1995)
    Springer
    Journal of chemical crystallography 25 (1995), S. 123-128 
    Details
    ISSN: 1572-8854
    Schlagwort(e): Nucleoside ; hydrated nucleoside ; anomeric differences ; pyrimidine ; uracil ; xylofuranosyl ring ; isopropylidene rings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract 5-Acetyl-1-(3,5-O-isopropylidene-α-D-xylofuranosyl) uracil monohydrate (α-AXU·H2O) crystallizes in an orthorhombic cell of dimensionsa=7.286(6),b 14.281(10),c=15.852(11) Å. Its structure has been determined by direct methods from single-crystal CuK α X-ray data and refined to a conventionalR factor of 0.055 over 1708 unique reflections. The furanose ring has conformation C2'endo-C3'endo (rather than the uncommon C3'endo-C4'exo as in β-AXU) and the glycosidic torsion angle is −31° (17° in β-AXU). The oxygen of the water molecule in α-AXU·H2O accepts a hydrogen bond (O 10...O 5=2.70 Å) from the sugar hydroxyl O5 and the hydrogens form hydrogen bonds to a uracil carbonyl (O 10...O 2=2.78 Å) and an isopropylidene oxygen atom (O 10...O 7=2.90 Å).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01665987
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    High resolution 1H NMR spectra of 2,2′-biquinoline (1982)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 18 (1982), S. 42-44 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: From analysis and refinement by the LAOCOON III program of the 220 MHz 1H spectrum of 2,2′-biquinoline, recorded as a saturated solution in carbon disulphide, most derived chemical shifts and coupling constants are close to corresponding values in quinoline. However, H-3 is at 1.5 ppm lower field in 2,2′-biquinoline than in quinoline and the ortho-coupling 3J(34) in the heterocyclic ring is 0.5 Hz larger in 2,2′-biquinoline than in quinoline; fairly free rotation about the 2,2′ bond is inferred.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270180110
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    High-resolution NMR spectra of fluorene and its derivatives: VIFor Part V see Ref. 2. - 1-methylfluorene, truxene and decacyclene (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 272-277 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The overlapping spin systems in the 220 MHz 1H spectra of 1-methylfluorene (1) in carbon disulphide and deuteriated chloroform solutions have been analysed separately and refined by LAOCOON with the aid of methyl- and methylene-decoupled spectra. Ortho-coupling constants in the 6-membered rings are similar to each other and to those in fluorene (4). Solvent and concentration shifts suggest loose pairing of solute molecules. 220 MHz 1H spectra of α-truxene (2) in carbon tetrachloride and deuteriated nitrobenzene, 220 MHz 1H spectra of decacyclene (3) in carbon tetrachloride, and 90 MHz FT 1H spectra of 3 in deuteriated chloroform show steric deshielding; the solvent dependence of shifts also suggests solute pairing in 2. Shifts in 1H decoupled 22.6 MHz 13C spectra of 2 in deuteriated chloroform were assigned with the aid of Cr(acac)3 relaxation agent.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270140410
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