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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 1424-1435 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pyrrolinones, III.  -  Annelated Nitrogen-containing 5,5-Ring Systems from 3-Pyrrolin-2-onesThe 5,6-dihydropyrrolo[3,4-d]imidazol-4(3H)-ones 10 and 11 are formed by hydrogenation of 1 and condensation of the resulting diaminopyrrolinone with orthoformate or formamide, respectively. No cyclization occurs in the corresponding reaction with acetylacetone and on condensation of the hydrogenated hydrazonopyrrolidinone oxime 16 with orthoformate. The syntheses of the 5,6-dihydropyrrolo[3,4-d]furazan-4-ones 19 and 20, of the 5,6-dihydropyrrolo[3,4-d]furazan-4-one 3-oxides 21-24, and their reactions, and the syntheses of the 3-imino-4,5-dihydropyrrolo[3,4-c]pyrazol-6(3H)-ones 34 and 35 are described.
    Notes: Durch Hydrierung von 1 entstehendes Diaminopyrrolinon wird mit Orthoameisensäureester oder Formamid zu den 5,6-Dihydropyrrolo[3,4-d]imidazol-4(3H)-onen 10 bzw. 11 kondensiert. Bei der entsprechenden Umsetzung mit Acetylaceton sowie der Kondensation des hydrierten Hydrazonopyrrolidinonoxims 16 mit Orthoameisensäureester tritt keine Cyclisierung ein. Die Synthesen der 5,6-Dihydropyrrolo[3,4-d]furazan-4-one 19 und 20, der 5,6-Dihydropyrrolo[3,4-d]furazan-4-on-3-oxide 21-24 und deren Reaktionen sowie die Synthese der 3-Imino-4,5-dihydropyrrolo[3,4-c]pyrazol-6(3H)-one 34 und 35 werden beschrieben.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pyrrolinones, IV Pyrrolin-2-ones with Electron Attracting Substituents in the β-PositionsThe pyrrolinones 3-7, synthesized from maleic acid derivatives and enamines and also their reaction products 8-24 are described. By comparison with the classic-type dipyrromethenes 26, 30, and 31 the dipyrromethenes 27 as well as 25, 28, and 29 are shown to exist as lactams (neo-type dipyrromethenes). In basic solution 27 exhibits a deep blue color which is unusual for dipyrromethenes.
    Notes: Die aus Maleinsäure-Derivaten und Enaminen gewonnenen Pyrrolinone 3-7 und ihre Umsetzungsprodukte 8-24 werden beschrieben. Durch vergleichende Untersuchungen mit den klassischen Dipyrromethenen 26, 30 und 31 wird nachgewiesen, daß 27 ebenso wie 25, 28 und 29 Lactamstrukturen aufweisen, also als Neo-dipyrromethene vorliegen. 27 zeigt in basischen Lösungen eine für Dipyrromethene ungewöhnliche tiefblaue Farbe.
    Type of Medium: Electronic Resource
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