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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2197-2208 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Synthesis of Fluoranthenes and Related Aromatic Polycycles by Means of Pyridinium SaltsBenzyl-and fluorenylpyridinium- and isoquinolinium salts 1, 7, 8 react with activated alkenes (2) to yield tetrahydroindolizines (3, 9, 10), which easily undergo ring-opening with acids forming cyclimonium salts (4, 11, 12). These salts, which may be isolated in some cases, may be regarded as masked β,γ-unsaturated ketones. The tetrahydroindolizines and their subsequent products are cyclised with zinc chloride to compounds like substituted naphthalenes, fluoranthenes, and higher aromatic polycycles 15 not described before.
    Notes: Benzyl- und Fluorenylpyridinium- sowie -isochinoliniumsalze 1, 7, 8 geben mit Verbindungen mit aktivierter Doppelbindung (2) Tetrahydroindolizine (3, 9, 10), die mit Säuren leicht den Fünfring zu Pyridinium-(Isochinlinium-)-Salzen (4, 11, 12) öffnen. Diese Salze, die sich in bestimmten Fällen isolieren lassen, kann man als verkappte β, γ-ungesättigte Ketone auffassen, in die sie in der Fluorenreihe auch übergehen. Die Tetrahydroindolizine und ihre Folgeprodukte können mit Zinkchlorid, meistens glatt, zu substituierten Naphthalinen, Fluoranthenen und höheren, bisher nicht bekannten, aromatischen Polycylen 15 ringgeschlossen werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2669-2679 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: (Trihalogenomethyl)dihydropyridines1-(2,6-Dichlorobenzyl)- and 1-ethylpyridinium salts react with haloformate anions to yield (trihalogenomethyl)dihydropyridines. Depending on the haloform used 1,2- or 1,4-dihydropyridines are formed primarily. The 2-(trichloromethyl)-1,2-dihydropyridines 1 can be rearranged to the 4-(trichloromethyl)-1,4-dihydropyridines 2 in polar aprotic solvents. This rearrangement is investigated kinetically. The chemical differences between the 1,2-dihydropyridines 1 and the 1,4-dihydropyridines 2 are demonstrated by the reactions with proton-donors like bromoform, nitromethane, and methanol as well as with triphenylmethyl perchlorate, tetracyanoethylene, and 4-phenyl-1,2,4-triazoline-3,5-dione.
    Notes: 1-(2,6-Dichlorbenzyl)- und 1-Ethylpyridinium-Salze ergeben mit Haloformat-Anionen (Trihalogenmethyl)dihydropyridine. Je nach dem verwendeten Haloform werden primär nur die 1,2- oder die 1,4-Dihydropyridine gebildet. Die 2-(Trichlormethyl)-1,2-dihydropyridine 1 lagern sich in polaren, aprotischen Lösungsmitteln in die 4-(Trichlormethyl)-1,4-dihydropyridine 2 um. Die Kinetik dieser Umlagerung wird untersucht. Die grundsätzlich unterschiedlichen Reaktionen der 1,2-Dihydropyridine 1 und der 1,4-Dihydropyridine 2 mit Protonendonatoren wie Bromoform, Nitromethan und Methanol sowie mit Triphenylmethyl-perchlorat, Tetracyanethylen und 4-Phenyl-1,2,4-triazolin-3,5-dion werden beschrieben.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3224-3225 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 1692-1697 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on α-Chlorocylimonium Salts, IV. - Further Heteropolycyclic Systems and Their Dihydro Precursorsα-Chloro-N-phenacylcyclimonium salts react with heteroaromatics to give novel ring systems. The dihydro-precursors 2 can be isolated in good yields. They are readily oxidised by hexacyanoferrate (III), forming the heteroaromatic compounds 3, and are considerably deeper yellow than the latter.
    Notes: α-Chlor-N-phenacylcyclimoniumsalze 1 lassen sich mit Heteroaromaten glatt zu neuen Ringsystemen umsetzen. Es gelang nun auch, in guten Ausbeuten die Dihydrovorstufen 2 zu gewinnen, die mit Hexacyanoferrat(III) die Dehydroverbindungen 3 liefern. Die Dihydro Salze 2 sind erheblich tiefer gelb als die Dehydro-Salze 3.
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