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  • 1
    Electronic Resource
    Electronic Resource
    A multinuclear NMR (13C, 15N and 29Si) study of the Si—N bond in silylamines: (p - d) π interaction (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 12-16 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of variously substituted aminosilanes was investigated by 15N NMR spectroscopy to obtain further information on the controversial problem of pπ-dπ interaction in these systems. The 15N NMR data are consistent with the 13C and 29Si results and suggest that the (p-d)π backbonding is not negligible in these systems. The values of the 15N chemical shifts and the 13C parameters [δ13C and J(13CH)] are discussed in terms of nitrogen lone-pair delocalization and provide a good basis for explaining the variations of the 29Si chemical shifts with the nature of the nitrogen atom substituents.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120104
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  • 2
    Electronic Resource
    Electronic Resource
    Application of 15N spectroscopy and dynamic NMR to the study of ureas, thioureas and their lewis acid adducts (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 13 (1980), S. 396-402 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rotational barriers and 15N chemical shifts have been measured in a number of ureas and thioureas. As anticipated on the basis of the 15N shifts, several previously unobserved rotational barriers could be detected by using lanthanide reagents or a high field spectrometer. Nearly constant effects on both the rotational activation energy and the 15N shift are produced on going from ureas to the corresponding thioureas, and correlations are found between the ΔG
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270130603
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  • 3
    Electronic Resource
    Electronic Resource
    Processus de rotation empéchée autour de la liaison C—N dans les anilines (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 221-225 
    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: In anilines, intramolecular exchange of amino protons appears at low temperatures. Relations between activation parameters and electronic effects of substituents are studied and NMR parameters discussed.
    Notes: Dans les anilines une non équivalence des protons aminés, due à la rotation empêchée autour de C—N apparait à basse température. Les relations entre les paramètres d'activation et les effets électroniques des substituants sont étudiés et les paramètres RMN sont discutés.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050506
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  • 4
    Electronic Resource
    Electronic Resource
    Barrières de Rotation Autour des Liaisons C—N dans la Série des Urées. Influence du Remplacement de C=O par C=S (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 187-191 
    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: NMR spectroscopy has been used to investigate the barrier of rotation about the carbonnitrogen bond in ureas and thioureas. NMR and activation parameters are determined and compared.
    Notes: Une barrière de rotation de faible valeur autour de la liaison N—CO est mise en évidence dans les urées de formule CH3—NH—CO—NHR (R = H, CH3). Les thiourées correspondantes sont examinées afin d'étendre l'étude comparative des systèmes carbonyle-thiocarbonyle. Les paramètres RMN et les grandeurs thermodynamiques liées au processus d'isomérisation sont discutés.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030204
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Structural determination of a polydimethylsiloxazane by multinuclear magnetic resonance (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 455 (1979), S. 103-111 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Strukturbestimmung eines Polydimethylsiloxazans durch Multikernresonanz-Messungen29Si-, 15N- 13C- und 1H-NMR-Daten werden für das Polydimethylsiloxazan Si19C38N16O4H132 angegeben. Zur Interpretation der verschiedenen chemischen Verschiebungen dieser Verbindung werden Bereiche der chemischen Verschiebung verwendet, die für Monomereinheiten des Polymeren charakteristisch sind. Die 29Si-chemische Verschiebung korreliert mit der 13C-chemischen Verschiebung und δ 14N einer Reihe homologer Verbindungen.
    Notes: 29Si, 15N, 13C, and 1H NMR data are presented for the polydimethylsiloxazane Si19C38N16O4H132. The interpretation of the different chemical shifts of this compound is proposed using a selection of chemical shift ranges for units (block or random) and end stopper groups. The 29Si chemical shift correlate with 13C chemical shift and with the δ 14N for a series of homologous compounds.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794550112
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    Paper (German National Licenses)
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