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  • 1
    Electronic Resource
    Electronic Resource
    Assignment of the NMR spectra of benzo[b]triphenyleno[1,2-d]thiophene through the application of zero quantum proton - proton correlation combined with proton-detected long-range multiple quantum heteronuclear chemical shift correlation (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 287-295 
    Details
    ISSN: 0749-1581
    Keywords: 2D NMR ; Proton zero quantum coherence ; Heteronuclear chemical shift correlation ; Long-range heteronuclear multiple quantum coherence ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Assignment of the congested proton and carbon NMR spectra of heterocyclic benzo[b]triphenyleno[1,2-d]thiophene was accomplished through the concerted application of several two-dimensional NMR experiments. The inherent insensitivity of homonuclear zero quantum coherence to magnetic field inhomogeneity was used to advantage in disentangling the heavily overlapped proton NMR spectrum. Direct heteronuclear pairings were established using heteronuclear correlation with broad band homonuclear vicinal proton decoupling. Limited sample availability and solubility precluded complete establishment of long-range heteronuclear correlations by conventional means. Proton-detected long-range heteronuclear multiple quantum coherence did, however, provide sufficient long-range heteronuclear correlations to complete the assignment.A comparison of the data obtained from COSY and zero quantum experiments is presented; the ability of each to establish proton connectivities is discussed. Sensitivity limitations inherent in the conventional long-range optimized heteronuclear chemical shift correlation experiment are contrasted with the advantages of the proton-detected long-range heteronuclear multiple quantum correlation experiment. Practical limitations of the latter are considered.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260260404
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    HMQC-NOESY: Application to a polynuclear aromatic at natural abundance (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 774-778 
    Details
    ISSN: 0749-1581
    Keywords: Heteronuclear multiple quantum coherence ; HMQC ; HMQC-NOESY ; Polynuclear aromatic ; Homonuclear NOE ; 1H-1H NOE ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Orientation of proton spin systems relative to one another in polynuclear aromatics through the use of 1H homo-nuclear nuclear Overhauser effects (NOE) detected by heteronuclear multiple quantum correlation (HMQC-NOESY) at natural abundance is reported. The experiment was explored as a potential alternative for problems in which a solution cannot be obtained by more conventional methods. Optimization of the HMQC-NOESY experiment is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260280908
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Total assignment of the 1H and 13C NMR spectra of phenanthro[9,10-b]thiophene: Concerted use of two-dimensional NMR techniques (1989)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 318-322 
    Details
    ISSN: 0749-1581
    Keywords: 2D NMR ; Heteronuclear chemical shift correlation ; Heteronuclear relayed coherence transfer ; Proton-detected long-range heteronuclear multiple quantum coherence ; HMBC ; Low-pass J-filtration ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H and 13C NMR spectra of phenanthro[9,10-b]thiophene were totally assigned using a combination of twodimensional NMR techniques. Direct hetcronuclear correlations were established using heteronuclear chemical shift correlation with semi-selective proton decoupling. Two methods were employed to establish the identity of vicinal neighboring protons: heteronuclear relayed coherence transfer and low-pass J-filtered heteronuclear relayed coherence transfer. The versatilities of the two techniques were compared. Quaternary carbon resonance assignments and the orientations of individual spin systems relative to one another were accomplished using the proton-detected long-range heteronuclear multiple quantum coherence experiment (HMBC). Key long-range inter-ring proton homonuclear spin couplings served to confirm the orientations of the proton spin systems.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260270404
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  • 4
    Electronic Resource
    Electronic Resource
    Total assignment of the 1H- and 13C-NMR spectra of dinaphtho[1,2-b:1′,2′-d]thiophene through the concerted use of two-dimensional NMR techniques (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 839-847 
    Details
    ISSN: 0749-1581
    Keywords: 2D NMR ; heteronuclear chemical shift correlation ; COSY ; double quantum coherence ; zero quantum coherence ; relayed coherence transfer ; J-filtration ; long range heteronuclear shift correlation ; BIRD pulse ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H- and 13C-NMR spectra of dinaphtho[1,2-b:1′2′-d]thiophene (1), a sulfur-containing polynuclear heteroaromatic, have been totally assigned using a combination of two-dimensional NMR techniques. Techniques applied were standard proton-proton COSY, proton zero-quantum coherence (ZQCOSY, optimized to 7 Hz and to 1.75 Hz), proton double quantum coherence (DQCOSY, optimized to 7 Hz), broad-band decoupled (both dimensions) proton-carbon chemical shift correlation, long-range proton-carbon chemical shift correlation, and proton-carbon heteronuclear relayed coherence transfer. A comparison of these methods on 1 showed the most useful information concerning connectivities to be obtained from the zero-quantum coherence and long-range heteronuclear correlation experiments. A detailed critique of each type of experiment is given in the context of applications to polynuclear aromatics.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260261007
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  • 5
    Electronic Resource
    Electronic Resource
    Benzo[b]phenanthro[4,3-d]thiophene: Spectral assignment by two-dimensional NMR methods and tertiary structure determination (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 1039-1043 
    Details
    ISSN: 0749-1581
    Keywords: Heteronuclear relayed coherence transfer ; Carbon-carbon double quantum coherence ; Two-dimensional NMR ; 2D NMR ; Polynuclear aromatics ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two-dimensional heteronuclear chemical shift correlation, heteronuclear relayed coherence transfer and autocorrelated 13C - 13C double quantum coherence have been used to assign the proton and 13C NMR spectra of benzo[b]phenanthro[4,3-d]thiophene. The highly complementary nature of the heteronuclear relay and carbon-carbon double quantum spectra conveniently provides the means of avoiding breaks in the carbon-carbon connectivity network assembled by the latter, which may arise when strongly AB rather than AX carbon-carbon pairings are encountered. Nuclear Overhauser difference spectra have shown the title compound to possess a tertiary helical structure similar to that of phenanthro[3,4-b]thiophene; the average separation between the H-1 and H-13 atoms of the title compound was found to be 2.06 ± 0.04 Å.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260241206
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