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  • 1
    Publication Date: 1988-01-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical chemistry 13 (1993), S. 53-57 
    ISSN: 1572-8897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mathematics
    Notes: Summary Well-shaped single crystals of the [2]-[azacyclohexacosane]-[cyclooctacosane]-catenane were crystallized from butyl acetate solution. Investigating monocrystals with X-rays, we have found a tetragonal symmetry: a = b =10.48 Å, c = 52.15 Å; four molecules per unit cell; space lattice type 141. The scattering intensities of the crystals had been extremely weak at higher theta values. We tried to calculate the structure with only 253 reflections and therefore the refinements (full matrix) converged to R = 0.15.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical chemistry 13 (1993), S. 47-51 
    ISSN: 1572-8897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mathematics
    Notes: Abstract A [2]-catenane consisting of methylene groups and two additional acetylated aza groups has been synthesized in a multi-step sequence. After splitting off the acetyl bonds, the resulting secondary diamine should provide a good starting material for stepreaction (condensation or addition, respectively) polymerization.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1570-1579 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkylation of Polyphenol Derivatives, III. 2,6-Di-n-alkyl-1,4-benzoquinones with Long Alkyl ChainsThe syntheses of 1,4-benzoquinones 7, 13, and 23, substituted in the 2,6-positions with dodecyl residues, are described. The corresponding phenol ethers were acylated with dodecanoic acid/boron trifluoride and/or metalated and then alkylated with 1-bromododecane. The dialkylated phenol ethers 5, 11, and 20 were demethylated with boron tribromide and dehydrogenated to the corresponding benzoquinones with nitric acid or iron(III) sulfate, respectively.
    Notes: Es wird die Synthese der 2,6-Dodecyl-1,4-benzochinone 7, 13 und 23 beschrieben. Die Einführung der Dodecylreste erfolgte durch Acylierung entsprechender Phenoläther mit Dodecansäure/Bortrifluorid und/oder Metallierung der Phenoläther mit anschließender Alkylierung durch 1-Bromdodecan. Die dialkylierten Phenoläther 5, 11 und 20 wurden mit Bortribromid entmethyliert und mit Salpetersäure bzw. Eisen(III)-sulfat zu den Chinonen dehydriert.
    Additional Material: 1 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 497-502 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses and 13C N.M.R. Spectra of High Membered CycloalkadiynesThe syntheses of cycloalkadiynes 3 with 19 up to 44 ring members by alkylation of the dilithium salts of terminal alkadiynes 2 with α,ω-dibromoalkanes 1 are described. The 13C n. m. r. spectra of 3 are recorded.
    Notes: Hochgliedrige Cycloalkadiine 3 mit 19 bis zu 44 Ringgliedern werden durch Alkylierung der Dilithium-Salze terminaler Alkadiine 2 mit α,ω-Dibromalkanen 1 dargestellt. Die 13C-Kernresonanzspektren von 3 werden kurz diskutiert.
    Additional Material: 2 Tab.
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2910-2917 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkylation of Polyphenol Derivatives, II. 4,6-Di-n-alkylpyrogallol Trimethyl Ethers. Model Investigation toward the Directed Syntheses of CatenanesModel reactions for the synthesis of a catenane with the molecular subunit 2 are described. 4,6-Dialkylpyrogallol trimethyl ethers can be prepared from pyrogallol trimethyl ether (3) by stepwise metalation with butyllithium and alkylation with alkyl halides. 4,6-Didodecylpyrogallol (8) is acetalized with cyclohexanone to 10 and, after methylation to 11, converted to the nitro compound 12.
    Notes: Es werden Modellreaktionen zur Synthese eines Catenans mit der molekularen Untereinheit 2 beschrieben. 4,6-Dialkylpyrogallol-trimethyläther lassen sich aus Pyrogallol-trimethylather (3) durch schrittweise Metallierung mit Butyllithium und Alkylierung mit Alkylhalogeniden herstellen. 4,6-Didodecylpyrogallol (8) wird mit Cyclohexanon zu 10 acetalisiert und nach Methylierung zu 11 zur Nitroverbindung 12 umgesetzt.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1019-1028 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Ozonolytic Degradation of Substituted 1,4-BenzoquinonesThe exhaustive ozonolysis of the 1,4-benzoquinones 1a,b,c,e, and f at -40 to 0°C in ethyl acetate/methanol (10:1) yields, after reduction with dimethyl sulfide, 13,14,15-heptacosatrione (2) in moderate yields. Under analogous reaction conditions, the quinones 1d and g do not yield the triketone 2. The reaction of the monohydroxy-1,4-benzoquinone 1b with one molequivalent of ozone results, by an anomalous ozonide fragmentation, after reduction with dimethyl sulfide, in the formation of the lactol 12 with 90% yield.
    Notes: Die erschöpfende Ozonolyse der Benzochinone 1a,b,c,e und f bei -40 bis 0°C in Ethylacetat/Methanol (10:1) ergibt nach Reduktion mit Dimethylsulfid in mäßigen Ausbeuten 13,14,15-Heptacosatrion (2). Die Chinone 1d und g liefern unter analogen Reaktionsbedingungen kein Triketon 2. Bei der Umsetzung des Monohydroxy-1,4-benzochinons 1b mit einem Moläquivalent Ozon entsteht infolge anomaler Ozonspaltung nach Reduktion mit Dimethylsulfid mit 90% Ausbeute das Lactol 12.
    Additional Material: 1 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1258-1268 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Comparative N.M.R. Studies on Macrocycles and on a CatenaneThe 1H and 13C n. m. r. Spectra of a [2]-catenane (1) and its molecular subunits (2,3) were measured in CDCl3, C6D6, and C6D12. In the 13C n.m.r. spectrum low fields shifts of up to 1 ppm are noted in going from the molecular subunits to the catenane. These can be explained by van der Waals interactions between the two subunits. In the 1H n.m.r. spectrum high field as well as low field shifts can be observed which are mainly caused by solvent effects. For comparison the spectra of the cycloalkanes from C6H12 up to C44H88 are discussed as a function of ringsize.
    Notes: Die 1H- und 13 C-Kernresonanz-Spektren eines [2]-Catenans 1) und seiner molekularen Untereinheiten (2, 3) wurden in CDCl3, C6D6 und C6D12 gemessen. Im 13C-NMR-Spektrum beobachtet man beim Übergang von den molekularen Untereinheiten zum Catenan Tieffeldverschiebungen von bis zu 1 ppm, die mit van der Waals-Wechselwirkungen zwischen den beiden Untereinheiten erklärt werden können, Im 1H-NMR-Spektrum findet man sowohl Hochfeld- als auch Tieffeldverschiebungen, die in erster Linie durch Lösungsmitteleffekte hervorgerufen werden. Die Spektren der Cycloalkane von C6H12 bis C44H88 werden zum Vergleich in Abhängigkeit von der Ringgröße diskutiert.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3228-3230 
    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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