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  • 1
    Electronic Resource
    Electronic Resource
    Poly(styrylmethylthiol) as an efficient debrominating reagent of 1,2-dibromides
    Amsterdam : Elsevier
    Tetrahedron Letters 24 (1983), S. 3913-3916 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)94312-0
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  • 2
    Electronic Resource
    Electronic Resource
    Solid-phase cosolvents. A polymer analog of N-methyl-2-pyrrolidone based on crosslinked polystyrene
    Amsterdam : Elsevier
    Tetrahedron Letters 27 (1986), S. 3525-3528 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)84840-6
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  • 3
    Electronic Resource
    Electronic Resource
    Polymer-supported dimethyl sulfoxide as phase-transfer catalyst (1984)
    Springer
    Polymer bulletin 11 (1984), S. 215-221 
    Details
    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 Crosslinked polystyrenes with pendant -CH2SOCH3 grouping are efficient phase-transfer catalysts in liquid-liquid reactions of 1-bromooctane with several inorganic nucleophiles. Direct introduction of -CH2SOCH3 grouping into polystyrene by the reaction of a halogenated polystyrene with methylsulfinyl-methylsodium is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255343
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  • 4
    Electronic Resource
    Electronic Resource
    Pseudocrown ethers based on polyphosphazene as effective catalysts of nucleophilic substitution reactions (1986)
    Springer
    Polymer bulletin 15 (1986), S. 303-309 
    Details
    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 Polymer pseudocrownethers based on polyphosphazene are active catalysts of nucleophilic substitution reactions. With respect to the catalytic activity, polyphosphazene is a more suitable carrier of oligo(oxyethylenes) than poly(styrene-co-divinylbenzene). With increasing length of oligo(oxyethylene) branches the catalytic activity of polymers increases. The favorable effect of the content of pseudocrownether structures is particularly visible in polymers having a longer oligo(oxyethylene) chain in those reactions in which the polymer acts as a solid cosolvent. The catalysts preserve their activity also if reused.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00254848
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  • 5
    Electronic Resource
    Electronic Resource
    Polymer-supported aza-15-crown-5 as effective catalyst for phase-transfer reactions (1989)
    Springer
    Polymer bulletin 22 (1989), S. 261-264 
    Details
    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 Immobilized aza-15-crown-5 were prepared by the reaction of chloromethylated polystyrene resin with N-(2-hydroxyethyl)-aza-15-crown-5. These polymer-supported crowns were very effective catalysts of nucleophilic substitution reactions carried out under the conditions of the two-phase (L-S) or three-phase (L-S-L) catalysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282850
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  • 6
    Electronic Resource
    Electronic Resource
    Polymeric reagents (1988)
    Springer
    Polymer bulletin 20 (1988), S. 143-148 
    Details
    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 Poly (styrene-co-divinylbenzene) readily undergoes mercurization with mercuric trifluoroacetate in dichloromethane. The process and extent of mercurization only insignificantly depend on the degree of crosslinking of the polymer containing 1–4 mol.% of the crosslinking agent. By employing this procedure, polymers can be obtained with the mercury content approaching theoretical values. When heated in toluene, mercurized polymers are stable up to 50°C; at higher temperatures they undergo decomposition with splitting of the C-Hg bond. Poly (trifluoroacetoxymercurio)styrene, when reacted with tert-alkyl halides and with alkanes monotopically substituted with the aryl group and bromine, gives the corresponding trifluoroacetates under mild reaction conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256107
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  • 7
    Electronic Resource
    Electronic Resource
    Polymer-supported oligo(N-acetyliminoethylenes) new phase transfer catalysts (1986)
    Springer
    Polymer bulletin 15 (1986), S. 485-490 
    Details
    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 Oligo(N-acetyliminoethylenes), both free and grafted on polystyrene, polymethacrylate and cellulose were prepared by the ring-opening polymerization of 2-methyloxazoline. Their phase transfer catalytic activity in nucleophilic substitution reactions was examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281757
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  • 8
    Electronic Resource
    Electronic Resource
    Polymer reagents: preparation of polymer esters of thiocarboxylic acids based on crosslinked polystyrene (1986)
    Springer
    Polymer bulletin 15 (1986), S. 59-64 
    Details
    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 The process of acylation of polymer thiols based on microporous poly (styrene-co-divinylbenzene) (crosslinking agent content 1–2%) with carboxylic acids was investigated depending of the degree of functionalization, on the crosslinking of the polymer carrier and on the structure of acids. In the presence of dicyclohexylcarbodiimide and 4-dimethylaminopyridine the acylation reactions can be conducted to high degrees of the transformation of SH groups already at room temperature. The extent of such refunctionalization reactions depends neither on the degree of functionalization of the starting polymer thiol nor on the structure of the acids. Reactions of polymer esters of thiocarboxylic acids with primary, secondary and tertiary alcohols activated with mercury (II) trifluoroacetate lead to low ester yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263493
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  • 9
    Electronic Resource
    Electronic Resource
    Entwicklungstendenzen bei polymeranalogen Umsetzungen von Polyphosphazen (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 424-429 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymeranalogous reactions of poly(dichlorophosphazenes) with various nucleophilic reagents and the chemical and physical properties of the polymers modified in this way are discussed. The chemical inequality of the unit structure of the poly(organophosphazenes), which are obtained at these reactions, determines the properties of the polymers. The possibilities of formation of anomalous units and the dependence of their chemical structure on neighbouring group effects are analyzed. The relation between high molecular mass and the high sensitivity of polyphosphazenes to side reactions and anomalous units is shown.
    Notes: Polymeranaloge Umsetzungen von Poly(dichlorphosphazen) mit verschiedenen nukleophilen Reagenzien sowie die chemischen und physikalischen Eigenschaften der so modifizierten Polymere werden betrachtet. Die chemische Uneinheitlichkeit der Poly(organophosphazene), die bei diesen Reaktionen entstehen, bestimmt entscheidend deren Eigenschaften. Die Möglichkeiten der Entstehung von anomalen Gliedern und die Abhängigkeit ihrer chemischen Struktur von Nachbargruppeneffekten werden analysiert. Der Zusammenhang zwischen hoher Molekülmasse und hoher Empfindlichkeit der Polyphosphazene gegenüber Nebenreaktionen wird aufgezeigt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390807
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of polyamides by active polycondensation. The structural and kinetical aspects of active esters aminolysis reactionsLecture presented at the Prague Microsymposium on Polycondensation, 11-17 April, 1987. (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 523-533 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Auf Grund von IR- und NMR-Untersuchungen der Struktur unterschiedlich substituierter Phenylester wird eine durch den Raum wirkende Wechselwirkung zwischen den Elektronensystemen der ortho-Substituenten des Phenolrestes und dem Carbonylsauerstoff angenommen. Es wird gezeigt, daß diese Wechselwirkung die Reaktivität der aktiven Ester bei nucleophilen Substitutionen beeinflussen kann. Die Kinetik der Esteraminolyse in unterschiedlichen Medien wurde untersucht. Die Reaktion wird sowohl durch ein gering basisches, aprotonisches Lösungsmittel (Hexamethylphosphorsäuretriamid) als auch durch das Amin selbst katalysiert. Es wurde festgestellt, daß auch vernetzte pseudo-Kronen-ether auf Basis von Polyphosphazen einen katalytischen Effekt auf diese Reaktion ausüben.
    Notes: Based on IR and NMR investigations of the structure of different substituted phenyl esters the through-space interaction between the electronic systems of ortho-substituents of phenol residue and carbonyl oxygen is assumed. It is shown that this interaction may influence on the reactivity of the active esters towards nucleophilic substitution. The kinetics of ester aminolysis in different media was studied. The reaction is catalyzed both by a low basic aprotic solvent (hexamethylphosphortriamide) and by amine itself. It was established that crosslinked pseudo-crown ether based on polyphosphazene reveals a catalytic effect in this reaction as well.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390911
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