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  • 1995-1999
  • 1975-1979  (2)
  • 1978  (2)
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Years
  • 1995-1999
  • 1975-1979  (2)
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  • 1
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 13C NMR spectra of 43 benzothiazoles have been recorded in DMSO-d6. All carbon atoms have been attributed in an unambigous way owing to substituent effects in position 4, 5, 6 or 7. We discuss variations of chemical shifts as a function of the nature of the substituent in position 2 (equation of type: Δδ = aF+bR+cQ+d′), annelation in the benzoheterocyclic series, and prototropic tautomerism in the benzothiazolic series (in the case of the substituent in the 2-position being an OH, SH or NHR group).
    Notes: Les spectres de résonance magnétique nucléaire due carbone-13 de 43 benzothiazoles ont été enregistrés dans le diméthylsulfoxyde hexadeutérié. Tous les carbones ont été attribués de facon non ambiguë, grǎce aux effets de substituant sur les positions 4, 5, 6 ou 7. Nous discutons des variations des déplacements chimiques en fonction de la nature du substituant en 2 (équation triparamétrique du type: Δδ = aF+bR+cQ+d′), de l'annélation en série benzohétérocyclique et de la tautomérie prototropique en série benzothiazolique (dans le cas où le substituant en position 2 représente un groupement OH, SH ou NHR).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: We have demonstrated that the compounds obtained by quaternization of thiazolo[3,2-d]tetrazole, and two of its derivatives, 3-phenyl-thiazolo[3,2-d]tetrazole and tetrazolo[5,1-b]benzothiazole, are tetrazolium salts. The quaternization effects are discussed as a function of the 13C NMR results.
    Notes: Nous avons montré que les produits obtenus lors de la quaternisation du thiazolo[3,2-d]tétrazole, et de deux de ses dérivés, phényl-3 thiazolo[3,2-d]tétrazole et tétrazolo[5,1-b]benzothiazole, sont des sels de tétrazolium. Nous avons discuté des effets dus à la quaternisation en fonction des résultats de la RMN du 13C.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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