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  • Articles: DFG German National Licenses  (3)
  • Electronic Resource  (3)
  • 1990-1994  (3)
  • 1990  (3)
  • Chemistry  (3)
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  • Articles: DFG German National Licenses  (3)
Material
  • Electronic Resource  (3)
Years
  • 1990-1994  (3)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Heterocyclisch substituierte Arendiazoniumsalze mit erweiterter spektraler Empfindlichkeit. II. 4-(1-Heterocycliden-2,3-diaza-prop-2-en-3-yl)-benzendia-zoniumtetrafluoroborateHerrn Prof. Schulz zum 60. Geburtstag gewidmet (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 43-54 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocyclic Substituted Arenediazonium Salts with a Long-wave-length Range of Sensitivity. II. 4-(1-Heterocycliden-2,3-diaza-prop-2-en-3-yl)-arenediazonium tetrafluoroboratesThe title compounds (3) are obtained by reaction of aromatic bis-diazonium salts with substituted 2-benzylidene-1,3-dithioles and 2-benzylidene-1,3-diselenole, respectively. The maximum of the long wave-length absorption band of 3 varies from 580 nm up to 665 nm depending on the structure of the compound.The quantum yields of the photolysis of the diazonium salts 3 are low (1 · 10-4 to 7 · 10-3). The azo dyes obtained from 3 with usual azo-couplers absorb in a shorter wave-length range than the corresponding diazonium salts themselves (hypso-coupling effect).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320106
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Lewis-Säure- und photochemisch induzierte Dimroth-Umlagerung von 3H,6H-2,5-Bis-(p-N,N-dimethylaminophenyl)-1,2-thiazolino[5,4-d]1,2-thiazolin-3,6-dithion (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 387-393 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lewis-acid and Photochemically Induced Dimroth Rearrangement of 3H,6H-2,5-Bis-(p-N,N-dimethylaminophenyl) -1,2-thiazolino[5,4-d]1,2-thiazoline-3,6-dithioneThe reaction of 3H,6H-1,2-dithiolo[4,3-c]1,2-dithiole-3,6-dithione (5) with N,N-dimethyl-p-phenylendiamin gives, depending on the conditions of the reaction, 3H,6H-3-(p-N,N-dimethylaminophenyl-imino)-1,2-dithiolo[4,3-c]1,2-dithiole-6-thione (7), and 3H,6H-2,5-Bis-(p-N,N-dimethylaminophenyl) -1,2-thiazolino[5,4-d]1,2-thiazoline-3,6-dithione (3d). Catalyzed by Lewis acids the compound 3d rearranges reversibly into the isomeric 3H,6H-3,6-bis-(p-N,N-dimethylaminophenyl-imino) -1,2-dithiolo[4,3-c]1,2-dithiole (4d). The Dimroth type rearrangement of 3d into 4d occurs also on irradiation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320317
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    NMR-Untersuchungen zu Struktur und Beweglichkeit von substituierten Polyacetylenen (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 522-527 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(bis-methylthio-acetylene) and poly(bis-ethylthio-acetylene) were investigated by 13C-NMR with respect to the structure of the main chain and the mobility of the side chains. The main chain consists of sp2-hybridized carbon atoms. The 1,2-bisalkylthylen units build up a nonplanar polymer backbone, which does not show any discrete configurations. In poly(bis-methylthio-acetylene) the MeS units undergo a rotational diffusion motion with a resorentation rate of about 70 kHz. The electron spin dynamics have on importance within the main chain.
    Notes: Poly(bis-methylthio-acetylen) und Poly(bis-ethylthio-acetylen) wurden hinsichtlich der Struktur der Hauptkette und der Beweglichkeit der Seitenketten mittels 13C-NMR-Spektroskopie untersucht. Die Hauptkette bestecht aus sp2- hydridisierten C-Atomen. Die 1,2-Bisalkythioethylen-Einheiten bilden ein nicht-Planares Polymerrückgrat, für das keine distreten Konfigurationen nachzuweisen sind. In Poly(bis-methylthio-acetylen) führen die MeS-Einheiten eine Rotationsdiffusionsbewegung von etwa 70 kHz aus. Innerhalb der Hauptkette hat die Elektronenspindynamik keine Bedeutung.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411003
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    Paper (German National Licenses)
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