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  • Organic Chemistry  (3)
  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Elektrokatalytische Cyanomethylierung von Azomethinen: Eine neue Synthese für β-Aminonitrile (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 487-490 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrocatalyzed Cyanomethylation of Azomethines: A New Synthesis for β-AminonitrilesCertain Schiff-bases (2-7) react in acetonitrile (1) at a Hg-cathode in a new electrocatalyzed cyanomethylation method in good yields without side-products to β-aminonitriles (2a-7a). The synthesis is initiated by an electrochemical deprotonation of 1 by azomethine-radical anions in catalytical amount to acetonitril anions (B-). During nucleophilic reaction of B- with 2-7 up to its complete consumption, the cyanomethylation synthon B- is regenerated in a cyclic, self-reproducing process. Quantum chemical calculation in context with cyanomethylation product analysis permit mechanistical insights and exact prediction of suitable azomethines and coupling position for B-.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340607
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  • 2
    Electronic Resource
    Electronic Resource
    Ein einfacher Zugang zu 2H-Naphtho[1,2-c]1,2,3-triazolenHerrn Professor Dr. M. Schulz zum 60. Geburtstag gewidmet (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 331-335 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Simple Route to 2H-Naphtho[1,2-c]1,2,3-triazoles1-Arylazo-2-chloro-naphthalenes 9a-9k and 2,4-diarylazo-1-chloronaphthalenes 10a-10c are transformed by the reaction with sodium azide into 2-arylsubstituted 2 H-naphtho[1,2-c]1,2,3-triazoles 13a-13k and 14a-14c, resp., which exhibit fluorescence if they are not nitro or arylazo substituted. If the educts bear different bounded halogenes only the naphthalene linked chlorine is substituted by the azide ion.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320309
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  • 3
    Electronic Resource
    Electronic Resource
    Elektrochemische Synthese von (E)-Thiokohlensäure-S-ethenyl-O-ethyl-diestern (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 901-908 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrosynthesis of (E)-Ethenyl-O-ethyl-thiocarbonatesElectrochemical reductions of 4-aryl- and 4,5-diaryl-1,2,3-thiadiazols (1-5) in acetonitrile/0,1 M tetraalkylammonium-supporting-electrolyte at Hg-cathodes in the presence of ethylchloroformiate (CAE) yield (E)-S-(2-aryl) ethenyl- and S-(1,2-diaryl)ethenyl-O-ethyl-thiocarbonates (1a-5a). The S-carboxylation proceeds via preformation of cyclic-voltammetric- and 1H-nmr-provable CAE-complexes, ring-opening and N2-elimination in a two-electron reduction. The synthesis including a rearrangement of a N-tos-S-CAE-complex is discussed in context with CNDO/2 quantum chemical calculation. Thermochemical synthesis of this new class of thiocarbonates proved unsuccessful.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330613
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