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  • 1
    Electronic Resource
    Electronic Resource
    PMR investigation of organic cations - I: Trithienyl methyl carbonium ions (1970)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 159-164 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: PMR spectral parameters are reported for the isomeric trithienyl carbonium ions. The low field shifts, relative to the corresponding carbinols, are discussed in relation to the delocalization of the positive charge into the thiophene ring bonded in position 2 or 3. A linear correlation is found between chemical shifts and π-charge densities and the proportionality constant is higher than that previously found for benzene derivatives. Vicinal coupling constants in these systems are satisfactorily in agreement with the corresponding calculated π-bond order.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270020208
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A PMR investigation of organic cations - II: Mixed p-tolyl-thienyl carbonium ions (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 413-419 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The PMR spectra of isomeric p-tolyl-thienyl carbonium ions and the corresponding carbinols were studied in order to compare the relative abilities of 2-thienyl, 3-thienyl and p-tolyl groups to stabilize a carbonium ion. The low field shifts in the ions relative to the neutral molecules are discussed in terms of positive charge delocalisation, as seen by a comparison with calculated π charge densities. Additionally, vicinal coupling constants fit a correlation with π bond order, but this applies only to the thienyl groups in the ionic species.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270040307
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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