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  • 1985-1989  (2)
  • Analytical Chemistry and Spectroscopy  (2)
  • Imidazopyridine  (1)
  • Tautomerism  (1)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 992-994 
    ISSN: 0749-1581
    Keywords: 13C NMR ; Tautomerism ; Inotropism ; Imidazopyridine ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A detailed analysis of the 13C NMR spectra of the 1-N- and 3-N-methyl derivatives of 1H-2-(2,4-dimethoxyphenyl)imidazo[4,5-c]pyridine, utilizing long-range couplings and 2D 1H—13C correlation experiments, has led to an unambiguous assignment of all carbons. Comparison of these definitive assignments of C-3a and C-7a, in particular, with those of the tautomers of 1H-2-(2,4-dimethoxyphenyl)imidazo[4,5-c]pyridine has permitted confirmation of the predominance of the 1H-tautomer for the latter. In addition, previous conflicting assignments for 1H-imidazo[4,5-c]pyridine and its 3-N-methyl derivative are now resolved. Revision of these assignments leads to the conclusion that the 1H-tautomer of 1H-imidazo[4,5-c]pyridine is predominant.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 55-58 
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using 1H, 13C and 15N NMR it has been concluded that 3-deazarpurine protonates exclusively at N-1 with a pK of about 5.6. The base exhibits rapid tautomerism with proportions of 70:30, with the N-7-H tautomer in the majority. The salt exists predominantly as the N-7-H tautomer. 1-Deazapurine protonates essentially in a 1:1 ratio at N-3 and at the imidazole ring, with a pK of about 3.1. This base also exhibits rapid tautomerism with proportions of 30:70, this time with the N-9-H in the majority. The salt also exists in a tautomcric mixture with approximately equal proportions. One form has N-3 and N-9 bearing hydrogens and the other has N-7 and N-9 bearing hydrogens.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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