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  • Boranes  (1)
  • Chemically modified electrode  (1)
  • Linear rotation-scan method  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Syntheses, Structures, and Reactivity of 2,5-Diboryl-1-alkylpyrroles and Di(1-alkyl-2-pyrrolyl)boranes (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 399-404 
    Details
    ISSN: 1434-1948
    Keywords: Boranes ; 1-Alkylpyrroles ; Porphyrinogenes ; Lithiation ; Tin-boron exchange ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of 2,5-dilithiated 1-methylpyrrole (1a) with ClB(NR2)2 lead to the novel 2,5-diboryl-1-methylpyrroles 2a and 2b. Accordingly, 2,5-diboryl-1-benzylpyrrole 2d is obtained. 1a and Cl2BNiPr2 form the aminochloroboryl-substituted derivative 2c and the di(5-boryl-2-pyrrolyl)borane 4 in 29% and 15% yield, respectively. The 2,5-distannyl-1-methylpyrrole 1c is used for the synthesis of the aryloxy-boryl derivative 2e. Reacting monolithiated 1-methyl- and 1-benzylpyrroles with Cl2BNiPr2 yields the di(2-pyrrolyl)boranes 3e and 3f, respectively. NMR and MS data are in agreement with the compositions of the compounds, which are confirmed by X-ray structure analyses for 2a, 2b, 2d, und 3e.
    Additional Material: 3 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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