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Open Access Green as soon as Postprint is submitted to ZB.
Pulse-radiolytic investigations of catechols and catecholamines. 4. 3,4-Dihydroxybenzaldehyde and 3,4-dihydroxyacetophenone.
J. Phys. Chem. A 83, 3084-3088 (1979)
The model catechol compounds for adrenalone, 3,4-dihydroxybenzaldehyde and 3,4-dihydroxyacetophenone, were investigated by pulse radiolysis combined with kinetic spectroscopy. The rate constants with the oxidizing primary radicals in neutral aqueous solutions, hydroxyl radicals (4.8 × 109-5.9 × 109 M-1 s-1) and superoxide anions (1.4 × 107-2.9 × 107 M-1 s-1), differ by no more than a factor of about 2 from those of adrenalone itself. The mechanism for the oxidation by ·OH radicals or O2 - was identical for all three substances. The reduction rates with eaq - were determined both by kinetic analysis of the decay of eaq - and by competition experiments. The fact that the model compounds exclusively form the ketyl radical upon reduction, whereas adrenalone also reveals side-chain cleavage, was not reflected in the respective transient spectra. The second-order decay rates of the three ketyl radicals in alkaline solution all exceed 109 M-1 s-1 with a fivefold acceleration in near neutral solutions.
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Publication type
Article: Journal article
Document type
Scientific Article
ISSN (print) / ISBN
1089-5639
e-ISSN
1520-5215
Journal
Journal of Physical Chemistry A
Quellenangaben
Volume: 83,
Issue: 24,
Pages: 3084-3088
Publisher
American Chemical Society (ACS)
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institut für Biologie