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  • Chemically modified electrode  (1)
  • Epoxidation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Chiral Atropisomeric Metalloporphyrins in the Enantioselective Styrene Epoxidation (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1165-1171 
    Details
    ISSN: 1434-193X
    Keywords: Porphyrinoids ; Asymmetric catalysis ; Atropisomerism ; Epoxidation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -A new series of porphyrins has been synthesised, incorporating four identical chiral binaphthyl derivatives in the meso-positions. Owing to a hindered rotation around the bond between the naphthyl and the porphyrin, four atropisomers are generated, which were fully separated by preparative TLC and thoroughly characterised. The free bases were metallated with iron(III) and manganese(III) and the resulting complexes were used as catalytic precursors in styrene epoxidation. The reactions show chemoselectivity and enantioselectivity, depending on the stereochemistry of the metalloporphyrin. It is demonstrated that highest efficiency is performed by the ααββ isomer, showing C2 symmetry.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Kinetic study of electrocatalytic reduction of hydrogen peroxide at iron(III) porphyrin modified glassy carbon electrode in alkaline medium using the rotation-scan method (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 537-541 
    Details
    ISSN: 1040-0397
    Keywords: Chemically modified electrode ; σ-bonded pyrrole iron porphrin ; Catalytic hydrogen peroxide reduction ; Linear rotation-scan method ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reduction of hydrogen peroxide at a glassy carbon (GC) electrode modified with σ-bonded pyrrole iron(III) octaethylporphyrin complex, (OEP)Fe(Pyr), was studied by cyclic voltammetry and a rotating disk electrode. In 0.1 N NaOH solution, it is shown that such an (OEP)Fe(Pyr)/GC electrode has a significant catalytic activity towards hydrogen peroxide reduction (ED = -0.80 V, k = 0.066 cm s-1); however, the electrode stability is low. The deactivation is observed when the reaction charge (Q) is passing through the (OEP)Fe(Pyr)/GC disk electrode. A linear rotation scan method is applied to study the kinetic process by determining the disk electrochemical response (iD) to rotation rate (ω) at a definite disk potential (ED). Considering that the number of adsorbed electroreduced catalyst molecules (Red) varies according to the disk potential, a factor θ (= ΓRed/(ΓRed + ΓOx)) is introduced to describe the electrode surface area fraction for electroreduced species. The obtained Koutecky-Levich equation is applicable whatever the potential is.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070606
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