Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1975-1979  (6)
  • Analytical Chemistry and Spectroscopy  (6)
  • CCAATT enhancer binding protein
  • Cell & Developmental Biology
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Etude par RMN du carbone des systèmes C=N: imines, phénylhydrazones, semicarbazones, amidines, iminoéthers (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 326-330 
    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: A carbon-13 NMR study of compounds containing C=N or conjugated C—N bonds (iminoethers, saturated and unsaturated aliphatic imines, amidines, oximes, phenylhydrazones, semicarbazones) is presented. The influence of the Z/E isomerism, the substituents and the steric effects on the chemical shifts are discussed.
    Notes: Ce travail présente une étude par RMN de carbone-13 de composés comportant une double liaison C=N simple et conjuguée (iminoéthers, imines aliphatiques, imines éthyléniques, amidines, oximes, phénylhydrazones, semicarbazones). L'influence de la stéréoisomérie Z/E, des substituants et le rǒle de l'effet stérique sur le déplacement chimique sont discutés.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070707
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Application of 13C and 15N spectroscopy to the study of electronic delocalization in N—N bonds: Nitrosamines, hydrazones, triazenes and related protonated species (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 263-270 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C and 15N spectroscopies at natural abundance have been applied to the study of nitrogen lone-pair delocalization in N—N containing compounds: nitrosamines, nitramines, hydrazines, hydrazones and triazenes. Structure-chemical shift correlations have been derived for nitrosamines; the 13C upfield effect of a γ substituent has been used for assigning the configuration of both diastereoisomers in N,N-unsymmetrically substituted nitrosamines. Equations have been computed which permit the prediction of the electronic delocalization, expressed in terms of free enthalpy of activation ΔG≠298, as a function of δ15N and of the length of the N—N bond. 15N spectroscopy has also been applied to the study of the protonated species of nitrosamines and of acceptor-donor complexes of nitrosamines with Lewis acids. The behaviour of such N—N containing compounds is compared to that of amides.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120502
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Theoretical and empirical calculations of the carbon chemical shift in terms of the electronic distribution in molecules (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 2-17 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The principles of the theoretical calculations of the carbon atom screening constant are reviewed. The Independent Electron, SCF—MO and Valence Bond formulae are briefly discussed, and the relative importance of the different terms involved in an approximate decomposition of σ13C are pointed out. The variations of the excitation energy ΔE, the mean distance between the nucleus and 2p electrons, and the electronic charges and bond orders with the structure are presented. The nature of the steric effect is also explained. In a second part the various empirical correlations which make an evaluation of δ13C from structural and physical properties possible are shown. The actual substituent parameters of the main classes of compounds are listed and worked examples given to make the use of the tables easier. The correlations between δ13C and the electronic charge, electronegativity, Hammett-Taft constants, electric field effects, geometrical parameters, spectroscopic data (electronic transitions, screening of other nuclei) and pH are also discussed with a view to appraising the carbon screening.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070103
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Applications de la Résonance Dynamique du Proton et du Carbone-13 à l'Etude d'Azines Hétérocycliques. Mécanismes de Formation et d'Isomérisation (1978)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 16-19 
    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: A 1H and 13C n.m.r. study of heterocyclic azines is presented and the influence of Z/E isomerism on the 13C chemical shifts is examined. The kinetic study of the formation and Z/E isomerization of these compounds has been carried out and mechanisms of these reactions are discussed.
    Notes: Ce travail présente une étude structurale par RMN 1H et 13C d'azines hétérocycliques, l'influence de l'isomerie Z/E sur les déplacements chimiques 13C est examinée. L'étude cinétique de la formation et de l'isomérisation Z/E de ces composés a été effectuée et les mécanismes de ces réactions sont discutés.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270110105
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Etude des formes fermées et ouvertes de spiropyrannes benzothiazoliniques en RMN 13C et 1H par transformée de Fourier (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 62-73 
    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: Benzothiazolinic spiropyrans, merocyanines and photomerocyanines, thermally stabilised to a high degree, have been studied by means of Fourier transform 1H and 13C NMR. The results show the polarity of open forms such as merocyanines and photomerocyanines, their trans configuration, the alternation of the electronic density on the dimethine bridge between the ‘benzothiazolinic’ and ‘phenolate’ part of these molecules, and also a favoured configuration when photomerocyanines have an alkoxy or aryloxy group on the 3 position.
    Notes: Une étude comparative en RMN 13C et 1H par transformée de Fourier a été réalisée sur des spiropyrannes, des mérocyanines et des photomérocyanines hautement stabilisées thermiquement, en série benzothiazolinique. Les résultats obtenus mettent en évidence la polarité des formes ouvertes (mérocyanines et photomérocyanines stables), de façon générale leur configuration trans, la répartition alternée des densités électroniques sur le pont diméthinique reliant les parties ‘benzothiazolinique’ et ‘phénolate’ de ces molécules, l'existence d'une configuration privilégiée dans le cas de photomérocyanines où un groupement alkoxy ou aryloxy occupe la position 3.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270080203
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Etude par RMN du Proton de la Stéréochimie de Composés Ethyléniques Trisubstitués. Calcul Empirique et Calcul par Incréments de la Constante d'Ecran (1978)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 433-437 
    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 Pascual and Tobey approaches for evaluating the chemical shift of an olefinic proton have been tentatively applied to the case of substituents which often cause difficulties in signal assignment. The empirically calculated values of the differential shielding between olefinic protons in both Z and E configurations are compared to the experimental values of the chemical shifts in a series of 2-arylpropene nitriles. The Z configuration is proved to correspond to the less shielded nucleus and the observed solvent effects are consistent with this assignment. When the Z configuration predominates its nature has been unambiguously established by studying also the corresponding E isomer of which a very small quantity could be isolated. The results offer a good way for the computation of new substituent additive parameters (NH2, OH, ONa).
    Notes: Nous avons appliqué les approximations de Pascual et de Tobey pour évaluer le déplacement chimique d'un proton éthylénique dans le cas de substituants qui causent souvent des difficultés d'attribution de signaux. Les résultats des calculs empiriques de la différence d'écran entre les protons éthyléniques des deux configurations Z et E sont comparés aux valeurs expérimentales des déplacements chimiques dans une série d'aryl-2 propène nitriles. La configuration Z s'avère correspondre au proton le moins blindé et les effets de solvants observés concordent avec cette attribution. Lorsque la configuration Z est prépondérante, sa nature est établie sans ambiguïté, car de très faibles quantités de l'autre isomère E ont pu ětre obtenues et étudiées. Les résultats de cette méthode sont satisfaisants et permettent de déterminer de nouveaux paramètres d'incréments additifs (NH2, OH, ONa).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270110903
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...