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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Inorganica Chimica Acta 23 (1977), S. L23-L25 
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Microelectronic Engineering 19 (1992), S. 499-502 
    ISSN: 0167-9317
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Applied Surface Science 38 (1989), S. 250-258 
    ISSN: 0169-4332
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Cancer Genetics and Cytogenetics 68 (1993), S. 140-142 
    ISSN: 0165-4608
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Thin Solid Films 146 (1987), S. 201-207 
    ISSN: 0040-6090
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron Letters 31 (1990), S. 4791-4794 
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of superconductivity 8 (1995), S. 405-408 
    ISSN: 1572-9605
    Keywords: Eliashberg equations ; electron-phonon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We solve Eliashberg equations in the case of strong anisotropic electron-phonon coupling and low energy cutoff. In a simplified model representing the Fermi Surface of (CuO2)n planes, we exhibit ad-wave solution as well as a generalizeds-wave one.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 1209-1232 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The terpolymerization of ethylene, propylene, and methylcyclopentadienyl-5-endonorborn-2-enylmethane (III) by means of different vanadium-based coordination catalysts was investigated. The structure of III and its isomeric composition was studied by using vapor-phase chromatography, mass spectrometry, and NMR, infrared, and ultraviolet spectroscopy. The catalyst system V Acac3-Et2AlCl was used under different conditions, and the influence of several variables regulating the terpolymerization process were related to the properties of the resulting terpolymers (EPTM). The insertion of III into EPTM chains takes place randomly and does not influence the random distribution of comonomers. The selective opening of the norbornene double bond of III has been demonstrated by use of 2,3-dihydro-III as model compound. Tritiated III gave a radiochemical titer of unsaturation in excellent agreement with the value deduced from ultraviolet measurements. The influence of Lewis bases added to VAcac3-Et2AlCl catalyst is discussed.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 1-Isopropyliden-3a.4.7.7a-tetrahydroinden (I) kann mit äthylen und Propylen durch anionisch-koordinative Vanadin-Katalysatoren terpolymerisiert und mit äthylen copolymerisiert werden. Für die Polymeren werden die IR-, NMR- und UV-spektroskopischen Daten sowie die Molekulargewichtsverteilungen mitgeteilt.Der Einbau von I verläuft hauptsächlich über die öffnung der Cyclohexendoppelbindung. Im allgemeinen beträgt der Gehalt an I weniger als 10 Mol-%.Versuche, Homopolymere von I und Copolymere aus Propylen und I mit diesem Katalysatortyp zu erhalten, waren ohne Erfolg.Mit radikalischen oder mit anionischen Katalysatoren konnte aus I kein festes Polymeres erhalten werden. Lediglich mit AIBN wurden Oligomere erhalten, die Isobuttersäurenitrilgruppen, gebunden an das System der konjugierten Doppelbindungen, enthielten. In flüssigem Ammoniak gelöst, reagiert K oder KNH2 mit I in äquimolekularen Mengen zu wachsartigen Produkten, die keine NH2-Gruppen enthalten. Mit K werden Dihydroderivate von I gebildet.Die Ergebnisse lassen sich durch die Annahme erklären, daß sich aus I stabilisierte Radikale und Anionen bilden, die nicht zum Wachstum befähigt sind.
    Notes: By means of vanadium based anionic coordinate catalysts 1-isopropylidene-3a.4.7.7a-tetrahydroindene (I) can be terpolymerized with ethylene and propylene and copolymerized with ethylene. IR, NMR, UV spectroscopic data, and mol. wt. distributions are reported for the polymers.The incorporation of I is predominantly by opening of the cyclohexene double bond. The content of I was generally less than 10 mole-%.Attempts to obtain homopolymers of I and copolymers of propylene and I with this type of catalyst were unsuccessfull.No solid polymer could be produced from I by free radical or anionic catalysts. With AIBN only oligomers were obtained which had cyanoisobutyric groups attached to the conjugated double bond system. K or KNH2 in ammonia solution react with I in equimolar ratios to give waxy products which do not contain NH2 groups. With K di-hydrogenated derivatives of I are formed.The results have been interpreted in terms of stabilized radicals and anions derived from I which are unable to propagate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 143 (1971), S. 211-230 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 1-Isopropyliden-dicyclopentadien (III) wurde mit verschiedenen kationischen Katalysatoren (BF3·O(C2H5)2, TiCl4, Aluminiumäthylhalogeniden) zu amorphen Polymeren von hohem Molekulargewicht, im allgemeinen über 50 000, polymerisiert. Unter milden Bedingungen wurden keine öligen Oligomeren oder unlösliche Polymere erhalten.UV-, IR- und NMR-Untersuchungen zeigten, daß bei der Polymerisation 1.4-Öffnung erfolgt, wobei ein Polymeres entsteht, dessen Grundbausteine zwei Doppelbindungen enthalten. Ergebnisse der Pyrolyse unterbauen die vorgeschlagene Struktur.Der hohe Wert (0,74) des Exponenten der KUHN-MARK-HOUWINK-Gleichung zeigt an, daß es sich um ein lineares Polymeres handelt. Der Index der Uneinheitlichkeit, der aus der integralen Molekulargewichtsverteilung abgeleitet wurde, betrug 1,64. Die molekularen Dimensionen in Lösung wurden nach STOCKMAYER-FIXMAN und KURATA-STOCKMAYER bestimmt. Die charakteristische Konstante des Polymeren K⊖ (5,5·10-4) und der Parameter C∞ wurden mit denen anderer linearer Polymeren verglichen.Die kationische Copolymerisation von III mit 1-Isopropyliden-3a.4.7.7a-tetrahydroinden (I) ergab: r(I) = 1,05 ± 0,6 und r(III) = 2,29 ± 0,68.
    Notes: 1-Isopropylidene-dicyclopentadiene (III) has been homopolymerized by means of different cationic catalysts (BF3·OEt2, TiCl4, aluminum ethyl halides) to give amorphous polymers of high mol. wt., generally above 50,000. No oily oligomers or insoluble polymers were obtained under mild conditions.UV, IR, and NMR analysis showed that the repeating unit of the polymer arises from 1.4 opening of the conjugated diene system and that it contains two double bonds. Pyrolysis results support the proposed structure.The high value (0.74) of the exponent of the KUHN-MARK-HOUWINK equation indicates that the polymer is linear. The polydispersity index, deduced from the integral mol. wt. distribution function, was 1.64. The molecular dimensions in solution were determined by the STOCKMAYER-FIXMAN and KURATA-STOCKMAYER treatments. The characteristic constant K⊖ (5.5·10-4) and the parameter C∞ of the polymer were compared with those of other linear polymers.The cationic copolymerization of III with 1-isopropylidene-3a.4.7.7a-tetrahydroindene (I) gave: r(I) = 1.05 ± 0.6 and r(III) = 2.29 ± 0.68.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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