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  • 1975-1979  (8)
  • Chemistry  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Profil de Pics Métastables (Pertes de NO·) en Série Nitroindazolique (1979)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1979), S. 114-116 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The kinetic energy releases associated with the loss of NO⋅ from nitroindazole molecular ions have been measured. The results show that, although the mass spectra are nearly identical, the corresponding metastable peak shapes can be used to differentiate the five isomers.
    Notes: Les libérations d'énergie cinétique associées aux fragmentations (pertes de NO·) des ions moléculaires de nitroindazoles ont été mesurées. Les résultats montrent que le profil des pics métastables correspondants permettent de différencier les cinq isomères.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210140211
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Détermination du Site de Protonation de l'Azido-2 thiazole et du Thiazolo[2,3-e]tétrazole à Partir de la Largeur des Raies des Signaux Protoniques (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 10 (1977), S. 249-250 
    Details
    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 signals of protons bonded to carbon atoms in α position to the pyridinic nitrogen atom in thiazole and in γ position in thiazolo[2,3-e]tetrazole are broadened. This broadening disappears on irradiation at the 14N resonance frequency, on cooling, and in an acidic medium (in which the protonation sites in both molecules can be determined).
    Notes: Les signaux des protons fixés sur un atome de carbone en α d'un azote pyridinique en série thiazole et en γ en série thiazolo[2,3-e]tétrazolique sont élargis à cause de la présence d'atomes d'azote 14N; cet élargissement disparait par irradiation, par refroidissement et en milieu acide (dans ce cas, cela permet la détermination du site de protonation des deux molécules).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270100157
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Identification et Etude en Résonance Magnétique Nucléaire du Carbone-13 des Produits de la Réaction de Quaternisation en Série Thiazolo[3,2-d]tétrazolique (1978)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 507-509 
    Details
    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
    URL: http://dx.doi.org/10.1002/mrc.1270111007
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fragmentation d'azoles sous l'impact electronique VII -N-ethylbenzimidazoles (1975)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1975), S. 313-316 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbon-13 and deuterium labelling experiments show that the [M — CH3]+ ion observed in the mass spectrum of l-ethylbenzimidazole rearranges quantitatively to a quinoxalinium structure prior to HCN loss.
    Notes: Par marquages isotopiques (13C et D), on montre que l'ion [M — CH3]+ observé dans le spectre de masse du l-éthylbenzimidazole se réarrange quantitativement en une structure quinoxalinium avant l'élimination d'acide cyanhydrique.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210100409
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ionisation Chimique de Composés Aromatiques Nitrés (1979)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1979), S. 117-118 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The collision induced dissociations of [MH - 30]+ ions observed in the chemical ionization (methane) mass spectra of some nitro aromatic compounds show that these ions are formed by reduction in the ion source with subsequent protonation and not by the previously reported losses of NO· from the protonated molecular ions.
    Notes: Les dissociation induites par collisions d'ions [MH-30]+ observés lors de l'ionization chimique (méthane) de composés aromatiques nitrés indiquent que ces ions sont formés par réduction suivie de protonation et non par perte de NO⋅ des ions moléculaires protonés.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210140212
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Etudes d'Hétérocycles Pentagonaux Polyhétéroatomiques par RMN du 13C. Effets de Substituant, de la Benzocondensation et Etude de la Tautomèrie Prototropique en Série Benzothiazolique (1978)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 617-627 
    Details
    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
    URL: http://dx.doi.org/10.1002/mrc.1270111208
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Etudes RMN en série hétérocyclique. XV - Résonance Magnétique Nucléaire de 1H et de 19F de quelques fluoro-2 benzothiazoles (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 84-85 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical shifts and coupling constants of five 2-fluorobenzothiazoles 6-substituted by Me, H, F, Cl and NO2 are given. A large cross-ring coupling constant (J26 = 10·4 Hz) is found in the 2,6-difluorobenzothiazole.
    Notes: On donne les valeurs des déplacements chimiques et des constantes de couplage de cinq fluoro-2 benzothiazoles substitués en position 6 par Me, H, F, Cl et NO2. La constante de couplage J26 dans le difluoro-2,6 benzothiazole est trouvée égale à 10,4 Hz, ce qui représente en très grand couplage ‘cross-ring’.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070207
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  • 8
    Electronic Resource
    Electronic Resource
    Fragmentation d'azoles sous l'impact electronique VI-indazole (1975)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1975), S. 558-560 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Molecular ion isomerisation precedes the fragmentation of indazole upon electron-impact.
    Notes: Une ismérisation des ions molécularies précéde la fragmentation de l'indazole sous l'impact.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210100711
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    Paper (German National Licenses)
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