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  • 1
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A method is described to improve the oxidation stability of cyclopentadiene co- and terpolymers via cationic polymerization using 4-isopropenylphenols as polymerizable comonomers. The efficiency of these phenols depends on their part in the copolymer and on the number and size of their alkyl groups.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 234 (1996), S. 71-90 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Mittels 1H- und 13C-NMR-Spektroskopie werden Strukturuntersuchungen an Polyisobutenen, die durch Selektivpolymerisation hergestellt wurden, und an Handelsprodukten durchgeführt. Es ist möglich, die Signale “normalen” und einigen ungewöhnlichen Doppelbindungsstrukturen zuzuordnen. Die Ergebnisse werden mit Literaturdaten verglichen.
    Notes: Structural investigations of low-molecular-weight polyisobutenes synthesized by selective polymerization and of commercial polyisobutenes were made by 1H- and 13C-NMR spectroscopy. It is possible to attribute the signals to “normal” and to some unusual olefinic structures. A comparison was made to literature data.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 312 (1970), S. 1121-1129 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden Synthesen einiger kernhydrierter Stilben- und Tolanderivate beschrieben und die Kinetik der Bromaddition an die C—C-Doppel- bzw. -Dreifachbindung untersucht. Die Geschwindigkeit der Anlagerung von Brom wird durch Messung der Extinktion der Reaktionslösung am Maximum der Bromabsorption in CCl4 bei 417 nm ermittelt. Aus den kinetischen Messungen und den daraus berechneten Aktivierungsenergien lassen sich Schlußfolgerungen über den Einfluß der Substituenten am C-Atom 1 des Cyclohexanringes auf die Reaktionsgeschwindigkeit und die Reaktionsordnung ableiten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 39-45 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Properties of the CT-Bands of some aπ-bπ-Type EDA-ComplexesCT-bands with two maxima exist in the visible range of the spectra of EDA-complexes between tetracyanoethylene (TCNE) and stilbene derivatives. The CT-bands in the long wave length range of TCNE-complexes are in a linear correlation with the band maxima of the corresponding chloranile (CA) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) complexes. Ionization energies of the donors calculated from band positions of TCNE-, CA- and TCNQ-complexes are in a good accordance. For long wave length maxima of double bands a linear coherence exists between the transition energy and the stability of complexes.
    Notes: Bei den EDA-Komplexen zwischen Tetracyanoäthylen (TCNE) und Stilbenderivaten treten im sichtbaren Spektralbereich CT-Banden mit zwei Maxima auf. Die langwelligen CT-Bandenlagen der TCNE-Komplexe korrelieren linear mit den Bandenmaxima der entsprechenden Chloranil (CA)- und 7,7,8,8-Tetracyanochinodimethan (TCNQ)-Komplexe. Die aus den Bandenlagen der TCNE-, CA- und TCNQ-Komplexe berechneten Ionisierungsenergien der Donatoren stimmen untereinander gut überein. Für die langwelligen Maxima der Doppelbanden kann man einen linearen Zusammenhang der Übergangsenergie und der Komplexstabilität angeben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 253 (1997), S. 51-64 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Aus niedermolekularen Polyisobutenen können durch SH-en-Addition radikalisch polymerisierbare Makromonomere hergestellt werden, wenn die Thiole zusätzlich über eine Hydroxy-Funktion verfügen. Die durch radikalische oder elektrophile Additionsreaktion entstehenden Produktstrukturen lassen sich sowohl an den Modellverbindungen als auch an den Polymeren mittels 1H- und 13C-NMR nachweisen.
    Notes: Low molecular weight polyisobutenes can be transformed into macromonomers by means of SH-en addition, provided that the thiols contain an additional hydroxy group. The product structures formed by free-radical or electrophilic addition reactions can be determined on model compounds as well as on the polymers by 1H- and 13C-NMR spectroscopy.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 242 (1996), S. 183-197 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Auf der Basis niedermolekularer Polyisobutene wurden durch Alkylierung, Epoxidierung und SH-en-Addition sowie anschließende Veresterung mit Methacrylsäurederivaten radikalisch polymerisierbare Makromonomere hergestellt. Durch chromatographische Abtrennung unfunktionalisierter Polyisobutenanteile können hochfunktionalisierte Produkte (≥ 95%) auch aus Polyisobutenen erhalten werden, welche Doppelbindungsgehalte ≪ 1 aufweisen.
    Notes: Radically polymerizable macromonomers were synthesized by alkylation, epoxidation and SH-en addition of low-molecular-weight polyisobutenes followed by esterification with methacrylic acid derivatives. Highly functionalized products (≥ 95%) can be obtained from polyisobutenes with double bond content ≪ 1 by separation of non-functionalized polymer by column chromatography.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1033-1037 
    ISSN: 0170-2041
    Keywords: Charge transfer ; Donor-acceptor complex ; Ionization potential ; Phenol ; Tetracyanoethylene ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigations on the Charge-Transfer Interaction of Phenols with Tetracyanoethylene (TCNE)The donor properties of some phenol derivatives were determined by measuring the UV/Vis spectra of their CT complexes with tetracyanoethylene in 1,2-dichloroethane and acetonitrile at room temperature. The ionization potentials of the phenolic compounds have been calculated by using the longest visible charge-transfer absorption of the donor-acceptor complex by linear correlation analysis. The charge-transfer spectra are discussed in dependence on the ring substituents in terms of electronic and steric factors. Increasing donor strength of the substituents decreases the ionization potential of the phenols as demonstrated by an LFE relationship using the Hammett constants. However, ortho donor substituents enhance the donor strength of the aromatic ring as well.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 10 (1989), S. 157-161 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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