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  • Springer  (2)
  • 1990-1994  (2)
  • 1991  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inorganic and organometallic polymers and materials 1 (1991), S. 115-130 
    ISSN: 1572-8870
    Keywords: Phthalocyanine-cobalt complexes ; catalyst ; thiol oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cobalt(II)-phthalocyanines in different environments are investigated as catalysts for the oxidation of thiols. Water-soluble low molecular weight 2,9,10,23-tetracarboxyphthalocyanine (1b) and polymeric phthalocyanine (2b) with carboxylic end groups are prepared. Compound1b is covalently bound at linear and cross-linked poly(chloromethylstyrene) in the presence of pyridine to obtain the water-soluble polymers (3a, b) and gel-type polymers (4a, b). Covalent binding of1b to surface modified silica was also realized. Low molecular weight and polymeric phthalocyanines (1a, 2a) are synthesized on silica, alumina, and charcoal. In addition,1a is encapsulated in the interior of NaX zeolite. All materials are efficient catalysts for the oxidation of 2-mercaptoethanol. The mechanism employing water-soluble catalysts is discussed in the direction of a mononuclear complex coordinating dioxygen and thiol. Heterogeneous catalysts containing1a and2a on the carriers show enhanced activity with increasing dispersion. The proposed mechanism considers different reaction sites for the coordination of O2 and thiol.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of plant growth regulation 10 (1991), S. 71-79 
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract [3H]GA20 (1)1, fed toVicia faba seedlings, was converted to [3H]GA20 glucosyl ester (5) and [3H]GA20-13-0-glucoside (6). The GA20 glucosyl ester (5) was identified by HPLC-RC and by GC-MS of GA20-Me formed by transesterification of (5). The [3H]GA20-Me was crystallized to constant specific radioactivity with authentic GA20-Me. On HPLC-RC the GA20-13-0-glucoside (6) was shown to have the same retention time as an authentic sample. Subsequent enzymic hydrolysis gave a product with an HPLC retention time identical to that of authentic GA20 (1).
    Type of Medium: Electronic Resource
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