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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 1074-1081 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Cyclopropenes, IV. Synthesis and Structure of 2:1-Adducts from Spirocyclopropenes with Carbon DisulfideIn benzene solution at 140°C in a steel bomb the spirocyclopropenes 1a-d from 2:1-adducts 2a-d with carbon disulfide, the constitution of which has been elucidated by X-ray structure analysis of 2c. Thus, the 2:1-adducts have the structure 2 containing the spiro[thiophene-2(3H), 2′(5′H)-thiophene] as basic system. Possible mechanistic pathways for the selective formation of 2 are discussed.
    Notes: Die Spirocyclopropene 1a-d bilden mit Kohlenstoffdisulfid in benzolischer Lösung bei 140°C im Autoklaven die 2:1-Addukte 2a-d, deren Konstitution durch eine Röntgenstrukturanalyse von 2c ermittelt wurde. Danach besitzen die 2:1-Addukte die Struktur 2, in der das Spiro[thiophen-2(3H), 2′(5′H)-thiophen] als Grundsystem enthalten ist. Mechanistische Vorstellungen zur selektiven Bildung von 2 werden diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1726-1747 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Diazoazoles, VII. 3H-Azolo-1,2,4-triazoles by 1,8- or 1,12-Electrocyclizations of 3H-Pyrazol-3-one- or 3H-Indazol-3-one (Diorganylmethylene)hydrazones, Respectively3H-Azolo-1,2,4-triazoles 3 are formed by cycloreactions 2b) of diazoazoles 1 with diazoalkanes 2 and with fluorene--N-, P-, S-ylides 4, respectively, (Method A) or by cyclizing dehydrogenation of diorganylmethanone (1H-azol-3-yl)hydrazones 7 (Method B). In both methods the anellation of the triazol system results from 1,8- or 1,12-electrocyclization of azol-3-one (diorganylmethylene)-hydrazones (azines) 9, as could be shown in the case of the 4-nitrophenyl compound 9dk. - Spectroscopic data (UV, 1H NMR, 13C NMR) of the 3H-azolo-1,2,4-triazoles 3 are discussed.
    Notes: 3H-Azolo-1,2,4-triazole 3 entstehen durch Cycloreaktion2b) von Diazoazolen 1 mit Diazoalkanen 2 bzw. mit Fluoren-N-, P-, S-Yliden 4 (Methode A) oder durch cyclisierende Dehydrierung von Diorganylmethanon-(1H-azol-3-yl)hydrazonen 7 (Methode B). Bei beiden Methoden erfolgt die Triazolanellierung durch 1,8- bzw. 1,12-Elektrocyclisierung von Azol-3-on-(diorganylmethylen)-hydrazonen (Azine) 9, wie im Fall der 4-Nitrophenylverbindung 9dk gezeigt werden konnte. - Spektroskopische Daten (UV, 1H-NMR, 13C-NMR) der 3H-Azolo-1,2,4-triazole 3 werden diskutiert.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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