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  • 1
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of tetrameric copper(I) iodide-piperidine, a complex with a tetrahedral tetrakis[copper(I) iodide] core (1978)
    s.l. : American Chemical Society
    Inorganic chemistry 17 (1978), S. 714-718 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50181a043
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reaktionen mit Allylidenphosphoranen, IV. Einfache Synthese von Cyclopentadienonen (Cyclonen) (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2785-2789 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions with Allylidenephosphoranes, IV. An Easy Synthesis of Cyclopentadienones (Cyclones)The allylidenephosphoranes 2 react with α-ketocarbonyl chlorides 3 readily to afford the cyclopentadienones 4 and their Diels-Alder dimers 5. With an excess of 2a, 4a undergoes competitive Michael additions yielding a mixture of 4-allylidene-2-cyclopentenone 6 and 4-(1-propenyl)-2-cyclopentenone 7.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170820
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen mit 2,4-Dimethylen-1,3-dithietanen. Mercaptopyridine; Thiazole; Dithiole; mesoionische und nichtmesoionische 1,2,3-Thiadiazole (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 2058-2067 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis with 2,4-Dimethylene-1,3-dithietanes., Mercaptopyridines; Thiazoles; Dithioles; Mesoionic and Non-mesoionic 1,2,3-ThiadiazolesThe thioketene carboxylates 6, generated in situ from 2,4-dimethylene-1,3-dithietanes 1, undergo cyclocondensation with aminocrotonic acid derivatives 5 to give the 4-mercaptopyridines 4, whereas with the esters 7 of glycine and thioglycolic acid the alkylidenethiazolidine and alkylidene-1,3-dithiolane 8, resp., are formed. In contrast, with diazoalkanes 1,3-dipolar cycloaddition takes place to yield the not yet described mesoionic and non-mesoionic 5-methylene-1,2,3-thiadiazoles 10 and 9, resp., in one operation.
    Notes: Die aus den 2,4-Dimethylen-1,3-dithietanen 1 in situ erzeugten Thioketencarbonsäureester 6 cyclokondensieren mit Aminocrotonsäure-Derivaten 5 zu den 4-Mercaptopyridinen 4, mit Glycin-bzw. Thioglycolsäureester 7 zum Alkylidenthiazolidin bzw. Alkyliden-1,3-dithiolan 8. Dagegen findet mit Diazoalkanen 1,3-dipolare Cycloaddition statt, wobei in einem Arbeitsgang die noch nicht beschriebenen mesoionischen und nichtmesoionischen 5-Methylen-1,2,3-thiadiazole 10, bzw. 9 gebildet werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160603
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Neue Heterocyclisierungen mit Isocyaniden 2,3-Diiminopyrrole; 4,5-Diiminoimidazole und 1H-Pyrrolo[2,3-b]pyrazine (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 271-274 
    Details
    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
    URL: http://dx.doi.org/10.1002/cber.19881210211
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    1,3-Ambident nucleophile Phosphor-Ylide, V. (2-Iminoethyliden)phosphorane (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 3536-3543 
    Details
    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
    URL: http://dx.doi.org/10.1002/cber.19861191204
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    Paper (German National Licenses)
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