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  • Analytical Chemistry and Spectroscopy  (7)
  • Konische Durchdringung  (1)
  • Wiley-Blackwell  (8)
  • 1
    Electronic Resource
    Electronic Resource
    The structural dependence of two-bond 13C—13C coupling constants (1981)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 17 (1981), S. 97-102 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two-bond 13C—13C coupling constants are discussed on the basis of INDO-SCPT calculations. The dependence of 2J(CC) on bond angle variation and on methyl substitution is evaluated, and it is shown that 2J(CC) depends linearly on the bond orbital s-character product of the terminal carbon atoms, whereas no systematic relationship with the hybridization of the central carbon atom was obtained. Alkyl group substituent effects are found to be additive. The coupling constants of a number of cyclobutane derivatives are discussed on the basis of these structural relationships; it is shown that the experimental findings can be interpreted quite consistently by assuming a dual-pathway coupling mechanism.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270170205
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  • 2
    Electronic Resource
    Electronic Resource
    13C,13C coupling constants of conjugated dienes (1981)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 17 (1981), S. 153-155 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: One bond 13C,13C- and 13C,1H-coupling constants have been measured for some 1,2-dimethylene-cycloalkanes, as well as for 2,3-dimethylbuta-1,3-diene and methylenecyclobutane. The results for 2,3-dimethylbuta-1,3-diene confirm the findings for buta-1,3-diene, i.e. that J(C-1, C-2) is smaller for the diene than for the correspondingly substituted monoene. No differences have been found between the 1J(CC) exocyclic coupling constants of the dimethylene and monomethylene cycloalkanes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270170217
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  • 3
    Electronic Resource
    Electronic Resource
    The structural dependence of vicinal 13C—13C coupling constants in s-cis-butane and cis-butane (1983)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 21 (1983), S. 465-466 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dependence of three-bond 13C-13C couplings of cis-butane and cis-butene on the valence angle, the torsional angle of the methyl groups and methyl and methylene substituents is discussed on the basis of INDO-SCPT calculations. The results support the interpretation of the experimental couplings between the bridgehead carbons of bicyclic hydrocarbons based on a multiple-path mechanism.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/omr.1270210802
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  • 4
    Electronic Resource
    Electronic Resource
    13C—13C coupling constants of cyclobutane derivatives (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 107-108 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Five 13C-labelled cyclobutane derivatives were synthesized and the couplings involving the labelled carbon were determined.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120215
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  • 5
    Electronic Resource
    Electronic Resource
    Konische Durchdringungen und der Mechanismus von Singulett-Photoreaktionen (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 107 (1995), S. 597-599 
    Details
    ISSN: 0044-8249
    Keywords: Ab-initio-Rechnungen ; Diradikaloide ; Konische Durchdringung ; Pericyclische Reaktionen ; Photochemie ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19951070507
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  • 6
    Electronic Resource
    Electronic Resource
    The structural dependence of geminal and vicinal CC coupling constantsDedicated to Professor W. Lüttke on the occasion of his 65th birthday (1985)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 23 (1985), S. 95-100 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: CC coupling constants of ten bicyclic hydrocarbons and ten cyclic ethers or carbonyl compounds were determined from the satellites of broad band decoupled spectra or from INADEQUATE measurements. The influences of valence angles, dihedral angles, hybridization and heterosubstitution on geminal and vicinal CC coupling constants are discussed in terms of the algebraic additivity of the contributions from individual coupling paths within the framework of a multiple path mechanism.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260230209
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  • 7
    Electronic Resource
    Electronic Resource
    Magnitude and sign of C,C coupling constants in acetylenes and allenes (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 456-461 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR ; one- and two- bond C,C coupling constants ; experimental and calculated values ; acetylenes and allenes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: One- and two-bond C,C coupling constants and the signs of ten of the two-bond coupling constants were determined from the INADEQUATE and SLAP spectra of four acetylenes and one allene. The geminal C,C coupling constants involving sp-hybridized carbons are found to be positive and to correlate linearly with the corresponding s character products. In contrast, INDO-SCPT calculations yield negative values for these coupling constants, and no correlation with the s character products. A separation of those parts of the coupling information transmitted by the σ and π electron framework, based on INDO-FPT-PRMO calculations, reveals some possible reasons for the poor performance of the INDO-SCPT method for systems with π-electrons.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250514
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  • 8
    Electronic Resource
    Electronic Resource
    CC coupling constants of unsaturated hydrocarbons (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 1016-1019 
    Details
    ISSN: 0749-1581
    Keywords: C,C coupling constants ; INADEQUATE ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR spectra of 24 unsaturated hydrocarbons (mono- and dienes) were investigated by means of the INADEQUATE pulse technique. All coupling constants larger than 1.5 Hz could be determined with an accuracy of ± 0.2 Hz.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260241118
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