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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 3408-3412 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2040-2042 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Aryl-3-chloro-1,2-diaziridines as Isolable Intermediates in the Preparation of 3-Aryl-3-chloro-3H-1,2-diazirinesThe formation of 3-aryl-3-chloro-3H-1,2-diazirines 3 from arylamidines 1 with sodium hypo-chlorite passes through intermediate 3-aryl-3-chloro-1,2-diaziridines 2, which are isolable at low temperature. The direct path 1 → 3 so far suggested therefore becomes unlikely.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Multistep Reversible Redox Systems, XXXV.  -  Voltammetry of Vinylogous Polyenes with Cross-Conjugated End Groups and UV/VIS Spectroscopy of their Radical Anions and CationsMost of the polyenes 1-5, especially of the vinylogous 2.n(n = 0-4) and 5.n(n = 1-4) are as well reversibly reduced as oxidized in two steps. As expected the large semiquinone formation constants decrease with increasing chain length (2: KSEMc = 1013-107; KSEMa = 1011-101). The UV/VIS spectra of the radical anions and cations of system 2.n, generated in solution, belong to the violene type; Δλmax ≈ 135 nm (SEMc) and Δλmax ≈ 160 nm (SEM). The potentials of 5.n and the UV/VIS spectra of the radicals of 5.1 point towards twisted molecules. The systems 2.n are the first polyenes which can exist in five oxidation levels and which form persistent radical anions and cations. The redox potentials of 2.n and the UV/VIS spectra of the radical ions are in accordance with the predictions of the Hückel theory.
    Notes: Die Mehrzahl der Polyene 1-5, insbesondere der Vinylogen 2.n (n = 0-4) und 5.n (n = 1-4) werden sowohl reversibel zweistufig reduziert als auch oxidiert. Erwartungsgemäß nehmen die großen Semichinonbildungskonstanten mit wachsender Kettenlänge ab (2: KSEMc = 1013-107; KSEMa = 1011-101). Die UV/VIS-Spektren der in Lösung erzeugten Radikalanionen und-kationen des Systems 2 (n = 0-4) sind vom Violentyp mit Δλmax ≈ 135 nm (SEMc) und Δλmax ≈ 160nm (SEM). Die Potentiale des Systems 5.n sowie die UV/VIS-Spektren der Radikal-Ionen aus 5.1 weisen auf Verdrillung hin. Mit 2.n liegen erstmals Polyene vor, die in fünf Oxidationsstufen existieren können und deren Radikal-Ionen persistente Lösungen bilden. Sowohl die Redoxpotentiale von 2.n als auch die UV/VIS-Spektren der Radikal-Ionen entsprechen den Erwartungen der Hückel-Theorie.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1980 (1980), S. 285-290 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Voltammetry of Triazenium SaltsTriazenium salts 2, a new class of compounds, are reversibly reduced to radicals 2R and partly to anions 2A. The potentials depend on the size of the ring formed by R3 + R4 as well as on the number of aromatic groups (R1, R2) and their substituents (systems 3-6).  -  The additive substituent effects obey the Hammett equation with p = 0.27-0.29.
    Notes: Die neuartigen Triazeniumsalze 2 lassen sich reversibel zu den Radikalen 2R und teilweise zu den Anionen 2A reduzieren. Die Potentiale hängen sowohl von der Größe des durch R3 + R4 geschlossenen Ringes als auch von der Anzahl der aromatischen Gruppen (R1, R2) und deren Substituenten ab (Systeme 3 - 6). -  Die additiven Substituenteneffekte gehorchen der Hammett Beziehung mit p = 0.27-0.29.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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