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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 3608-3612 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 2812-2821 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photochemisch wurden eine Reihe von monosubstituierten Metallcarbonylen mit phosphor-haltigen Liganden hergestellt und aus der Änderung der Valenzschwingungsbande νC=O die relative π-Acceptorstärke am Phosphoratom der Liganden bestimmt. Sie ist unabhängig vom jeweiligen Metallatom des Metallcarbonyls und kann klassifiziert werden, wobei typische Verbindungen als Vertreter der Klassen gewählt wurden.  -  Die π-Acceptorstärke nimmt zu in der Reihe: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm Klasse}:\,\,{\rm I}\,\,\,\,\,\,\,\, 〈 {\rm II}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, 〈 {\rm III}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, 〈 {\rm IV}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, 〈 {\rm V}\,\,\,\,\,\,\,\,\,\,\,\, 〈 {\rm VI}} \hfill \\ {{\rm Typ}:\,\,\,\,\,\,{\rm PR}_3 \,\,\, 〈 {\rm P}({\rm C}_6 {\rm H}_5)_3 \, 〈 \,{\rm PCl}({\rm C}_6 {\rm H}_5)_2 \, 〈 \,{\rm PCl}_2 {\rm C}_6 {\rm H}_5 \, 〈 \,{\rm PCl}_3 \,\,\, 〈 \,{\rm PF}_3 } \hfill \ \end{array} $$\end{document} Der Einfluß der Substituenten am Phosphor auf dessen π-Acceptorstärke wird diskutiert. Die gefundenen Gesetzmäßigkeiten ermöglichen die Voraussage der ungefähren π-Acceptor-stärke am Phosphor von noch nicht bekannten phosphorhaltigen Verbindungen vom Typ PX3-nRn(X = Halogen oder OR; R = Alkyl oder Aryl(.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 3613-3615 
    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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  • 4
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Cyclic oligomers of butylene terephthalate (16a - d) were synthesized by cyclocondensations of the corresponding dicarboxylic acid dichlorides (2 or 13) with diols (4, 10, or 15). The linear educts 2, 4, 10, 13, and 15 were obtained by stepwise synthesis. The resulting cyclic esters 16a - d were characterized by IR, NMR, and mass spectroscopy.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 5
    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: A method is presented for the fractionation of poly(butylene terephthalate) by means of a two-phase fractionation. A mixture of 1,1,2,2-tetrachloroethane and phenol was used as solvent phase and n-heptane as nonsolvent phase. Determination of the number average and weight average molecular weights of the individual fractions was carried out by gel permeation chromatography (GPC). For calibration of the elution volume from GPC, a fraction was used, the molecular weight of which had been determined by membrane osmometry to be 41.4 kg mol-1.By inserting the weight average molecular weight and the Staudinger index (viscosity number), which can be measured at 20°C in m-cresol into the rearranged Mark-Houwink equation \documentclass{article}\pagestyle{empty}\begin{document}$$ \ln \left[ \eta \right] = \ln {\rm K} + \alpha \ln {\rm \bar M}_{\rm w} $$\end{document} one can use a linear regression to calculate the value of the constants in this equation \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm K} = 2,79 \cdot 10^{ - 3} {\rm mlg}^{ - 1} ;\alpha = 0,93 $$\end{document}
    Notes: Es wird eine Methode zur Fraktionierung von Polybutylenterephthalat mittels einer Zweiphasenfraktionierung vorgestellt. Dabei dient eine Mischung von 1,1,2,2-Tetrachlorethan und Phenol als Löser und n-Heptan als Nichtlöser. Die Bestimmung der Zahlen- und Gewichtsmittel des Molekulargewichts der einzelnen Fraktionen erfolgt durch Gelpermeationschromatographie (GPC). Zur Eichung des Elutionsvolumens der GPC dient dabei eine Fraktion, deren Molekulargewicht membranosmometrisch zu 41,4 kg mol-1 bestimmt wurde.Durch Einsetzen der Gewichtsmittel des Molekulargewichts und der Staudinger-Indizes (Grenzviskositätszahlen), die in m-Kresol bei 20°C bestimmbar sind, in die umgeformte Mark-Houwink-Beziehung \documentclass{article}\pagestyle{empty}\begin{document}$$ \ln \left[ \eta \right] = \ln {\rm K} + \alpha \ln {\rm \bar M}_{\rm w} $$\end{document} kann mit einer linearen Regression der Wert der Konstanten dieser Gleichung berechnet werden \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm K} = 2,79 \cdot 10^{ - 3} {\rm mlg}^{ - 1} ;\alpha = 0,93 $$\end{document} .
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Reaction engineering in industrial high-pressure processes. The essential task of industrial chemistry is to transform cheap raw materials into high-quality materials and substances economically. From the very beginning, the chemical industry has used the energy sources coal, oil, and gas as the starting point for synthesis. These substances are introduced into the product line through high-pressure reactions. Joint developments in catalytic chemistry reaction kinetics, and plant design have permitted construction and operation of high-capacity, high-pressure plants at remote sites, where coal, oil, and gas are won. Industrial high-pressure chemistry is thus capable of transforming in situ raw materials that could be used otherwise into high-value products worth transporting to energy-poor regions and whose distribution is secured. The second part of this paper considers the technical limits of pumps, compressors, and high-pressure reactors. Approximate estimates of investment costs as a function of the pressure as process parameter are given for a high-pressure process step. Aspects to be taken into consideration during design, construction, and installation of factory-built high-pressure reactors are considered in condensed form in the last part.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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