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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 271-274 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Heterocyclizations with Isocyanides. - 2,3-Diiminopyrroles; 4,5-Diiminoimidazoles and 1H-Pyrrolo[2,3-b]pyrazinesIsocyanides add to the imidoylketene imines 1 or the vinylcarbodiimides 6, which in the parent system are isomeric with 1, to give the 2,5-diiminopyrroles 3. These have not yet been described. Similarly, from isocyanides and the imidoylcarbodiimide 12 the hitherto unknown 4,5-diiminoimidazoles 13 are obtained. Imidazole syntheses by formation of the 1,5- and the 4,5-bonds have not yet been reported.  -  A divinylcarbodiimide 8 has been first isolated. This readily reacts with isocyanides in a novel cyclodehydrogenation to afford the new 1H-pyrrolo[2,3-b]pyrazine ring 10 the structure of wich is confirmed by X-ray diffraction analysis.
    Notes: Die Imidoylketenimine 1 bzw. die im Grundsystem mit 1 isomeren Vinylcarbodiimide 6 addieren Isocyanide zu den 2,3-Diiminopyrrolen 3, die noch nicht beschrieben sind. Analog werden aus den Imidoylcarbodiimiden 12 und Isocyaniden die bisher noch nicht bekannten 4,5-Diiminoimidazole 13 gebildet. Die Imidazolsynthese durch Bildung der 1,5- und 4,5-Bindungen ist neu. - Ein erstmalig isoliertes Divinylcarbodiimid 8 reagiert mit Isocyaniden spontan in einer bisher noch nicht beobachteten Cyclodehydrogenierung zu dem neuen 1H-Pyrrolo[2,3-b]pyrazin-Ring 10, dessen Struktur durch Röntgenstrahlbeugungsanalyse belegt wird.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 3536-3543 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Ambident Nucleophilic Phosphorus Ylides, V. (2-Iminoethylidene)phosphoranesThe title compounds 8 undergo α,γ-reaction with dicarbonyl dichlorides (4, 5), mono- (9) and dicarboximidoyl chlorides (7) and N,N-bis(chloroformyl)amines (12) to give five- and six-membered N-heterocyclic phosphonium salts (1, 3, 6, 10, 14).  -  The 1,3-dipolar cycloaddition with N-phenylbenzonitrile imide (11) opens the way to a new one-step synthesis of 1,3,4,5-tetraaryl-1,2,4-triazolium salts 17. The structure of pyrrole derivative 2 is elucidated by X-ray analysis.
    Notes: Die Titelverbindungen 8 bilden durch α,γ-Reaktion mit Dicarbonsäuredichloriden (4, 5), Mono- (9) und Dicarbonsäure(bis)imidchloriden (7) bzw. N,N-Bis(chlorformyl)aminen (12) fünf- und sechsgliedrige N-heterocyclische Phosphoniumsalze (1, 3, 6, 10, 14).  -  Die 1,3-dipolare Cycloaddition mit N-Phenylbenzonitrilimid (11) eröffnet eine neue Einstufensynthese von 1,3,4,5-Tetraaryl-1,2,4-triazoliumsalzen 17. Von Pyrrolderivat 2 wird eine Röntgenstrukturanalyse mitgeteilt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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