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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2245-2260 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Spectra of Two Novel CatenanesIn multi-step reaction sequences the precatenanes 23b, c are synthesised. After breaking the chemical bonds between the aromatic nuclei and the bridge head atoms of the double bridged system the [2]-catenanes 25b, c are obtained. The 13C NMR and mass spectra of the precatenanes and catenanes are discussed.
    Notes: In mehrstufigen Reaktionsfolgen werden die Praecatenane 23b, c synthetisiert. Nach Spaltung der chemischen Bindungen zwischen den aromatischen Kernen und den Brückenkopfatomen des Doppelbrücken-Systems werden hieraus die [2]-Catenane 25b, c hergestellt. Die 13C-NMR- und Massenspektren der Praecatenane und Catenane werden diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1866-1872 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Scope and Limitations of Directed Syntheses of Catenanes., Improved Synthesis of Double-Bridged 1,4-Diaminobenzene DerivativesIn a one-flask reaction the double-bridged 1,4-diaminobenzene derivative 4a is synthesized in different solvents from 1,4-diaminobenzene and 1,10-dibromodecane. The highest yields are obtained in 2-pentanol and tert-amyl alcohol. - In a multi-step reaction sequence the [2]-precatenane 10 is synthesised starting from 3,5-tetracosamethylenepyrocatechol (7) and 1,19-dichloro-10-nonadecanone (8). The attempted transformation of this compounds into the corresponding [2]-catenane by splitting the bonds between the aromatic nucleus and the bridgehead atoms was unsuccessful.
    Notes: Das zweifach überbrückte 1,4-Diaminobenzol-Derivat 4a wird in einer Eintopfreaktion in verschiedenen Lösungsmitteln aus 1,4-Diaminobenzol und 1,10-Dibromdecan synthetisiert. Die höchsten Ausbeuten werden in 2-Pentanol- und tert-Amylalkohol erhalten. - In einer mehrstufigen Reaktionsfolge wird das [2]-Praecatenan 10, ausgehend von 3,5-Tetracosamethylenbrenzcatechin (7) und 1,19-Dichlor-10-nonadecanon (8) synthetisiert. Seine Umwandlung in das entsprechende [2]-Catenan durch Spalten der Bindungen zwischen dem aromatischen Kern und den beiden Brückenkopfatomen gelingt nicht mehr.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1374-1399 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Directed Synthesis of Translationally Isomeric [3]-Catenanes1)In a multi-step reaction sequence the tetrahydroxymetacyclophane 12c is synthesized. Acetalisation with 1,25-dichloro-13-pentacosanone followed by nitration and reduction afforded the diamine 13c. By cyclization of this compound in 2-pentanol with sodium carbonate and sodium iodide under high dilution conditions the monomeric products 16, 17, and 18 are obtained in yields of 21.4, 7.7, and 0.9%, respectively. On the basis of mass, 13C NMR and 1H NMR spectra the structure of these compounds is discussed. Starting from the precatenane 16 the [3]-catenanes 25a, b,c and 26a, b, c are obtained in a multi-step reaction sequence. The structure of these compounds is confirmed by mass, 13C NMR, and 1H NMR spectroscopic investigations.
    Notes: In einer vielstufigen Synthese wird das Tetrahydroxymetacyclophan 12c synthetisiert. Durch Acetalisierung mit 1,25-Dichlor-13-Pentacosanon, nachfolgender Nitrierung und Reduktion wird das Diamin 13c erhalten. Dessen Cyclisierung in 2-Pentanol in Gegenwart von Natriumcarbonat und Natriumiodid unter Verdünnungsbedingungen ergibt die monomeren Cyclisierungsprodukte 16, 17 und 18 in Ausbeuten von 21.4. 7.7 und 0.9%. Die Struktur dieser Verbindungen wird anhand der Massen-, 13C- und 1H-NMR-Spektren diskutiert. In einer mehrstufigen Reaktionsfolge werden aus dem Prä-[3]-catenan 16 die [3]-Catenane 25a, b, c und 26a, b, c erhalten. Die Struktur dieser Verbindungen wird durch 13C-NMR, 1H-NMR- und massenspektroskopische Untersuchungen bewiesen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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