ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1970-1974  (5)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 290-300 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reductive Rearrangements of the Retrobenzilic Acid Type Induced by Lewis Acids, VI. Crossing ExperimentsBy a series of crossing experiments the reductive retrobenzilic acid rearrangements of 5,5-diaryldithiohydantoins (1) and 4,4-diaryl-2-imidazoline-5-thiones (3), induced by aluminium chloride and yielding the corresponding 4,5-diaryl-4-imidazoline-2-thiones (2) and 4,5-diarylimidazoles (4), respectively, were shown to proceed intramolecularly.
    Notes: Durch eine Serie von Kreuzungsversuchen wird der intramolekulare Verlauf der durch Aluminiumchlorid ausgelösten reduktiven Retrobenzilsäure-Umlagerung von 5.5-Diaryl-dithiohydantoinen (1) und 4.4-Diaryl-Δ2-imidazolin-thionen-(5) (3) zu 4.5-Diaryl-Δ4-imidazolin-thionen-(2) (2) bzw. 4.5-Diaryl-imidazolen (4) erwiesen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermally Induced Reactions of Imidazole Derivatives, III. Thermal Rearrangement Akin to the Retrobeazlic Rearrangement of 2,4,4-Triaryl-5-alkylthio-, -5-aralkylthio-, and -5-arylthio-4H-imidazolesThermolysis of the title compounds (1) furnishes, under elimination of the sulfur containing group, the corresponding 2,4,5-triarylimidazoles (2). The sulfur containing group can be recovered as the corresponding dialkyl-and bis(aralkyl)disulfides, respectively, and/or as thioketones and transformation products of the latter. A free radical mechanism is suggested.
    Notes: Die Thermolyse der Titelsubstanzen (1) führt unter Abspaltung der schwefelhaltigen Gruppe zu den entsprechenden 2,4,5-Triarylimidazolen (2). Die schwefelhaltige Gruppe findet sich in Form des entsprechenden Dialkyl- bzw. Bis(aralkyl)disulfids und/oder Thioketons bzw. deren Folgeprodukten wieder. Für die Umwandlungen wird ein radikalischer Mechanismus nahegelegt.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1649-1653 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermally Induced Reactions of Imidazole Derivatives, IV. Thermal Rearrangements of 2,4,4-Triaryl-5-methylthio-4H-imidazoles. A Crossing ExperimentThe 1,2 aryl shift in the course of the thermal rearrangement of 2,4,4-triaryl-5-methylthio-4H-imidazoles into 2,4,5-triarylimidazoles has been demonstrated to proceed intramolecularly with the aid of a crossing experiment.
    Notes: Mit Hilfe eines Kreuzversuchs wird gezeigt, daß die 1,2-Arylverschiebung bei der thermisch induzierten Umlagerung von 2,4,4-Triaryl-5-methylthio-4H-imidazolen (1) in 2,4,5-Triaryl-imidazole (2) intramolekular verläuft.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydantoins, Thiohydantoins and Glycocyamidines, XXXI Reductive Rearrangements of the Retrobenzilic Acid Type Induced by Lewis Acids, VII The Anomalous Behaviour of 5.5-Dibenzyldithiohydantoin and of 4-4.Dibenzyl-2.5-bis-(methylthio)-4H-imidazoleOn refluxing 5.5-dibenzyldithiohydantoin (1d) and 4.4-dibenzyl-2.5-bis(methylthio)-4H-imidazole (2d) with aromatic hydrocarbons in the presence of aluminium chloride one of the C-benzyl groups is cleaved off the heterocycle and transferred to the solvent.
    Notes: Beim Kochen des 5.5-Dibenzyl-dithiohydantoins (1d) und des 2.5-Bis-methylmercapto-4.4-dibenzyl-4H-imidazols (2d) mit aromatischen Kohlenwasserstoffen in Gegenwart von Aluminiumchlorid wird eine der C-Benzylgruppen vom Heteroring abgespalten und auf das Lösungsmittel übertragen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1645-1648 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermally Induced Reactions of Imidazole Derivatives, IV. Kinetics of the Thermal Rearrangement of 2,4,4-Triaryl-5-methylthio-4H-imidazolesThe thermal rearrangements of the title compounds 1a - d into the 2,4,5-triarylimidazoles 2 in different solvents and at different temperatures are first order reactions. No linear relation exists between the effect of the p-substituents of the migrating aryl groups on the reaction rates and their Hammett-Brown σ+ values. The solvent has practically no effect on the rearrangement rate of 1c. The activation parameters of the rearrangement 1c → 2c are given.
    Notes: Die thermische Umlagerung der Titelsubstanzen 1a - d in die 2,4,5-Triarylimidazole 2 in verschiedenen Lösungsmitteln und bei verschiedenen Temperaturen folgt einem Geschwindigkeitsgesetz 1. Ordnung. Der Einfluß des p-Substituenten der wandernden Arylgruppe ändert sich nicht linear mit den Hammett-Brownschen σ+-Werten. Das Lösungsmittel hat praktisch keinen Einfluß auf die Umlagerungsgeschwindigkeit von 1c. Die Aktivierungsparameter der Umlagerung 1c → 2c werden angegeben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...