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  • Modular chemistry  (2)
  • Best. von Eisen, Cer, Dichromat, Kupfer, Nickel  (1)
  • Chemistry, Organic  (1)
  • 1
    Unknown
    Berlin, Heidelberg : Springer
    Keywords: Biochemistry ; Chemistry, Organic ; Nanotechnology ; Polymers
    ISBN: 9783540314745
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 451-458 
    ISSN: 1434-193X
    Keywords: Cross-coupling ; Modular chemistry ; Repetitive synthesis ; Macrocycles ; Shape persistence ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -The synthesis of a variety of kinked oligophenylene building blocks is described. The synthetic strategy is repetitive, utilizes the Suzuki cross-coupling protocol, and involves potentially bifunctional building blocks (modules) which carry one functional group for coupling and one group which serves as place holder. After the coupling, the placeholder is converted into a coupling functionality for the next growth step. The building blocks also carry chloro-substituents which are unaffected by all transformations. For one of the large building blocks it is shown that it actually can be cyclized into an oligophenylene macrocycle with a chloro-substituent at each corner and a pair of hexyl chains at each side.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 266 (1973), S. 177-186 
    ISSN: 1618-2650
    Keywords: Best. von Eisen, Cer, Dichromat, Kupfer, Nickel ; Volumetrie ; kernmagnet. Relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Quantitative determination of the concentration of paramagnetic ions in aqueous solutions is performed by NMR relaxation titration. By measurement of the nuclear spin-lattice relaxation time T 1 or the nuclear spin-spin relaxation time T2 redox titrations and complexometric determinations of the concentration of paramagnetic ions are possible. Also the precipitation of ions from the solution can be followed by this method. The use of a magnetic indicator in this analytical method is shown. The sensitivity of the method goes down to concentrations as low as 10−3 M. The accuracy of NMR relaxation titration is better than 1%. A number of applications of the method are given.
    Notes: Zusammenfassung Quantitative Bestimmungen von paramagnetischen Ionen in wäßrigen Lösungen können mit Hilfe der kernmagnetischen Relaxationstitration durchgeführt werden. Durch Messung der Kernspin-Gitter-Relaxationszeit T 1 oder der Kernspin-Kernspin-Relaxationszeit T 2 als Funktion der Ionenkonzentration sind Redoxtitrationen oder komplexometrische Titrationen möglich. Der quantitative Ablauf von Fällungen kann ebenfalls verfolgt werden. Die Verwendung von magnetischen Indicatoren bei der Relaxationstitration wird beschrieben. Bestimmungen von Ionenkonzentrationen bis herab zu 10−3 M Lösungen sind z.Z. möglich. Die Methode erlaubt eine Genauigkeit der Konzentrationsbestimmung von 1% und besser. Die Anwendung der Methode wird an einer Reihe von Beispielen gezeigt.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 303-309 
    ISSN: 0947-3440
    Keywords: Cross-coupling ; Modular chemistry ; Repetitive synthesis ; Nanostructures ; Synthesis design ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of a number of telechelic biphenyls with one of the functional groups, B(OH)2, TMS, Br and I, at each ring is presented. These biphenyls constitute a construction kit for modular chemistry using the Suzuki cross-coupling protocol.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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