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  • Polymer and Materials Science  (2)
  • Spectral assignments  (1)
  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of aromatic polymers via palladium-catalyzed cross-coupling reactions with magnesium, zinc, and tin reagents: A comparison (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2511-2519 
    Details
    ISSN: 0887-624X
    Keywords: cross-coupling polymerization ; palladium catalysis ; tin reagents ; magnesium reagents ; zinc reagents ; aromatic polymers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Difunctional magnesium, zinc, and tin reagents M=C6H4=O=C6H4=M (M = MgBr, ZnCl, SnBu3) in the presence of palladium or nickel catalysts undergo cross-coupling polymerizations with aromatic, heteroaromatic, benzylic, and allylic dihalides to give oligomeric and polymeric materials. Tin reagents lead to products of higher molecular weight than Mg and Zn reagents. The reaction is sensitive to the solvent and enhanced by magnesium halides. Increased reaction temperatures lead only to moderate increases in the degree of polymerization and are limited by catalyst decomposition above 200°C. The new poly(ether ketone) and poly(ether sulfone) type polymers prepared show high thermal stability. In contrast to conventional poly(ether sulfones)s, the biphenyl-based sulfone polymers reported here are crystalline. © 1992 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080301205
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of poly(arylene ethyne)s via palladium-catalyzed cross-coupling reactions with Cu and Sn reagents (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2503-2510 
    Details
    ISSN: 0887-624X
    Keywords: Poly(arylene ethyne) ; palladium ; cross-coupling reaction ; copper acetylide ; tin alkynyl reagent ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Comparative studies have been carried out of the effectiveness of two organometallic coupling reagents for the synthesis of poly(alkynylarene)s via palladium catalyzed cross-coupling reactions of dialkynes with organic dibromides. In comparison to copper reagents, monomeric difunctional trialkyltin acetylides show increased thermal stability which allows reactions to be performed at higher temperatures; they give oligomeric and polymeric materials of improved molecular weight. By contrast, the inferior solubility of copper acetylides limits chain growth, and above 140°C the Pd/Cul system is prone to homopolymerization of the dialkyne. The coupling reactions are solvent-dependent but not strongly influenced by the nature of the palladium precursor complex or the phosphine ligand. © 1992 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080301204
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  • 3
    Electronic Resource
    Electronic Resource
    13C NMR studies of α,ω-bis(p-anisyl)alkanes and α,ω-bis(3-iodo-4-methoxyphenyl)alkanes (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 798-800 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR ; Spectral assignments ; α,ω-Bis(aryl)alkanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C NMR studies were performed for a series of homologous iodinated and uniodinated α,ω-bis(aryl)alkanes. Spectral assignments were made by utilization of DQCOSY, HETCOR-LR and 1D coupled and decoupled 13C experiments.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260300818
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