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  • 1
    Publication Date: 1981-01-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 28-41 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on Diazo Compounds and Azides, LII. Stable Azomethine Imine Dipoles from Diazo Compounds and 3H-1,2,4-Triazole-3,5(4H)-dionesThe aryl-substituted diazo compounds 1a-h react with the triazolediones 2a-c at 20°C in benzene with loss of nitrogen to the stable azomethine imine dipoles 4a-p. Their 1,3-dipolar character is revealed in the addition of methanol and ethanol (4d-f→5a-f) as well as in cyclo-addition reactions with dimethyl acetylenedicarboxylate (4d,e→6a,b) and phenyl isocyanate (4d→7). Bisdipoles are obtained by two different ways: Either bisdiazo compounds are reacted with 4-phenyl-3H-1,2,4-triazole-3,5(4H)-dione (12a,b + 22a→13a,b) or the bistriazoledione 14 is transformed into the bisdipoles 15a-d with diazo compounds (1a,c,d and i). Dipole moments, molecular weights, IR, UV, 1H NMR, and 13C NMR spectroscopic data are in agreement with the dipole structures.
    Notes: Die arylsubstituierten Diazoverbindungen 1a-h reagieren mit den Triazoldionen 2a-c bei 20°C in Benzol unter Stickstoffverlust zu den stabilen Azomethinimin-Dipolen 4a-p. Ihr 1,3-dipolarer Charakter kommt sowohl in der Addition von Methanol und Ethanol (4d-f→5a-f) als auch in Cycloadditionsreaktionen mit Acetylendicarbonsäure-dimethylester (4d,e → 6a, b) und Phenylisocyanant (4d→7) zum Ausdruck. Bisdipole erhält man auf zwei verschiedenen Wegen: Entweder setzt man Bisdiazoverbindungen mit 4-Phenyl-3H-1,2,4-triazol-3,5(4H)-dion um (12a,b + 22a→13a,b), oder man wandelt das Bistriazoldion 14 mit Diazoverbindungen (1a,c,d und i) in die Bisdipole 15a-d um. Dipolmomente, Molmassen, IR-, UV-, 1H-NMR- und 13C-NMR-spektroskopische Daten sind im Einklang mit den Dipolstrukturen.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1315-1328 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on Diazo Compounds and Azides, LV. 7-(Diazomethyl)cycloheptatrienes by Electrophilic Diazoalkane SubstitutionThe silver-(diazomethyl)phosphoryl compounds 2a-c smoothly undergo electrophilic diazo-alkane substitution with 1 to give 3a-c. In contrast, a more complex product formation is encountered in the reaction of 1 with the mercury-bis(diazomethylcarbonyl) compounds 4a-d: Besides the 7-(diazomethyl)cycloheptatrienes 5a-d the styrene derivatives 6a-c as well as the bromomercurio compounds 7a-b are formed. Probably the norcaradiene intermediates 12 and 14 play a role in the formation of 6 and 7. The reaction of the 7-(diazomethyl)cycloheptatrienes 3a-c and 5a, b, d with PTAD (16) affords the [4 + 2]-cycloadducts 17a-f, derived from 7-(diazomethyl)norcaradiene isomers. The structures of 3, 5, and 17 are based above all on 1H and 13C NMR spectroscopic investigations.
    Notes: Die Silber-(diazomethylphosphoryl)-Verbindungen 2a-c gehen mit 1 glatt elektrophile Diazoalkansubstitution zu 3a-c ein. Im Gegensatz dazu begegnet man einem komplexeren Produktbild bei der Umsetzung von 1 mit den Quecksilber-bis(diazomethylcarbonyl)-Verbindungen 4a-d: Neben den 7-(Diazomethyl)cycloheptatriene 5a-d werden die Styrolderivate 6a-c sowie die Brommercurioverbindungen 7a-d gebildet. Die Norcaradienzwischenstufen 12 und 14 spielen vermutlich eine Rolle bei der Bildung von 6 und 7. Mit PTAD (16) liefern die 7-(Diazomethyl)cycloheptatriene 3a-c und 5a, b, d von Norcaradienisomeren abgeleiteten [4 + 2]-Cycloaddukte 17a-f. Die Strukturen von 3, 5 und 17 werden vor allem durch 1H und 13C-NMR-spektroskopische Untersuchungen ermittelt.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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