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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 763 (1972), S. 198-207 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 5-Oxo-pyrrolines via Acyl-enehydrazines5-Oxo-pyrrolines 3 are obtained in good yields by heating acyl-enehydrazines 2 with sodium methylate. This synthesis constitutes a convenient new general method of preparation of pyrrolinones. - Acyl-hydrazones 18 lead to 5-oxo-pyrrolines only in special cases. The mechanism of the pyrrolinone synthesis is discussed.
    Notes: Acyl-enhydrazine 2 lassen sich durch Erhitzen mit Natriummethylat in guten Ausbeuten in 5-Oxo-pyrroline 3 überführen. Diese neue Pyrrolinonsynthese ist verallgemeinerungsfähig. - Aus Acyl-hydrazonen 18 entstehen 5-Oxo-pyrroline nur in speziellen Fällen. Der Mechanismus der Pyrrolinonsynthese wird diskutiert.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 744 (1971), S. 81-87 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Pyrroles, Pyrazolines and Pyrazoles via Bis-en-hydrazinesSpecial cyclic and open-chain carbonyl compounds react with N.N′-dimethyl-hydrazine to bis-en-hydrazines 3 as intermediates which by thermolysis or acid catalysis give rise to the formation of N-methyl-pyrroles. Monomethylhydrazine gives in this reaction the same N-methyl-pyrroles, selectively. If the cyclization leads to pyrazolines, then the presence of a suitable leaving group effects the formation of the pyrazole or pyrazolium system by β-elimination.  -  The mechanisms of the reactions are discussed.
    Notes: Spezielle cyclische und offenkettige Carbonylverbindungen liefern bei der Umsetzung mit N.N′-Dimethyl-hydrazin über die entsprechenden Bis-en-hydrazine 3 als Zwischenstufen bei Säurekatalyse oder Thermolyse N-Methyl-pyrrole. Desgleichen führt die Umsetzung mit Monomethylhydrazin selektiv zu N-Methyl-pyrrolen. Infolge einer Konkurrenzreaktion werden gegebenenfalls Pyrazoline gebildet. Das Pyrazolin-System kann dabei, falls β-Eliminierung möglich ist, in das Pyrazol- bzw. Pyrazolium-System umgewandelt werden.  -  Die Mechanismen der Reaktionen werden diskutiert.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Indoles and Indole Alkaloids, XV.  -  Determination of the Absolute Configurations of N-Formylcarbinolamines of the Carbazole SeriesThe absolute configurations of the N-formylcarbinolamine derivatives 2, 3a and 3b are established by comparison of their ORD curves with that of the newly synthesized reference compound 9 of known absolute configuration.
    Notes: Es werden die absoluten Konfigurationen der N-Formyl-carbinolamin-Derivate 2, 3a und 3b ermittelt durch Vergleich ihrer ORD-Kurven mit derjenigen der neu synthetisierten Referenzsubstanz 9, deren absolute Konfiguration zuvor festgelegt worden ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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