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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3483-3494 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aminyl Oxides, XVI. Preparation of Acylaminyl Oxides and their Conformational BehaviourThe hydroxamic acids 5, obtained along with the O-acylhydroxylamines 6 upon acylation of N-tert-butylhydroxylamine, are oxidized to the open-chain acylaminyl oxides 1. The cyclic acylaminyl oxides 2 and 3 are prepared for purposes of comparison. The conformation of the radicals 1 and of some of the precursors 5 is studied by e.s.r. and i.r. spectroscopy using the corresponding cyclic compounds for comparison. The energy barrier for ring inversion in 3 is determined from temperature-dependent line broadening in the e.s.r. spectrum.
    Notes: Die bei der Acylierung von N-tert-Butylhydroxylamin neben den O-Acylhydroxylaminen 6 entstehenden Hydroxamsäuren 5 werden zu den offenkettigen Acyl-aminyloxiden 1 oxidiert. Zum Vergleich werden die cyclischen Acyl-aminyloxide 2 und 3 hergestellt. Die Konformation einiger Hydroxamsäuren 5 und der Radikale 1 wird unter Vergleich mit den entsprechenden cyclischen Verbindungen mittels IR- bzw. ESR-Messungen untersucht. Die Energiebarriere für die Ringinversion von 3 wird aus der Temperaturabhängigkeit der Linienverbreiterung des ESR-Spektrums bestimmt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1216-1223 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nitroxides, IX. Preparation of Cyclic Imino-nitroxides and Isotopically Labelled Porphyrexides. E. s. r. Spectroscopic Investigation on the Structure of PorphyrexideThe cyclic imino-nitroxides 4 and 10 and the disubstituted porphyrexide 14 are prepared as model compounds for porphyrexide (1), and their e.s.r. spectra are analysed. The unambigious interpretation of the e.s.r. spectrum of porphyrexide is achieved using the isotopically labelled porphyrexides 15-17.
    Notes: Als Modellsubstanzen für das Porphyrexid (1) werden die cyclischen Imino-nitroxide 4 und 10 sowie das disubstituierte Porphyrexid 14 dargestellt und ihre ESR-Spektren analysiert. Mit Hilfe der isotop-markierten Porphyrexide 15-17 gelingt die eindeutige Interpretation des ESR-Spektrums des Porphyrexids.
    Additional Material: 1 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 745 (1971), S. 159-163 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nitroxides, VII. Solvent Dependence in the ESR Spectra of Alkyl-acyl-nitroxidesThe nitrogen coupling constants aN of acyl-nitroxides 1 and 2 in aprotic solvents may be correlated with the ET-values for solvent polarity. The coupling constants aN in protic solvents are unexpectedly small. This is attributed to hydrogen-bonding at the carbonyl-oxygen which influences the distribution of spin density.
    Notes: Die Stickstoff-Kopplungskonstanten aN der Acyl-nitroxide 1 und 2 in aprotischen Lösungsmitteln lassen sich mit den ET-Werten für die Lösungsmittelpolarität korrelieren. Die unerwartet kleinen Kopplungskonstanten aN in protischen Lösungsmitteln werden auf Beeinflussung der Spindichte-Verteilung durch Wasserstoffbrücken-Bindung zum Carbonyl-Sauerstoff zurückgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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