On the Reactions of Thiols, Sulfenic Acids, and Sulfinic Acids with Hydrogen Peroxide

The reaction of thiols with H2O2 is central to many processes essential to life, from protein folding to redox signaling. The initial products are assumed to be sulfenic acids, but their observation, and the kinetic and mechanistic characterization of their subsequent reactions, has proven challengi...

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Veröffentlicht in:Angewandte Chemie 2017-05, Vol.129 (22), p.6351-6355
Hauptverfasser: Chauvin, Jean‐Philippe R., Pratt, Derek A.
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description The reaction of thiols with H2O2 is central to many processes essential to life, from protein folding to redox signaling. The initial products are assumed to be sulfenic acids, but their observation, and the kinetic and mechanistic characterization of their subsequent reactions, has proven challenging. The introduction of a 9‐fluorotriptycene substituent enabled the use of 19F NMR to directly monitor the reaction of a thiol with H2O2 to yield a sulfenic acid, and its subsequent oxidation to sulfinic and sulfonic acids. The oxidations are specific base catalyzed, as revealed by the lack of isotope effects and the dependence of the kinetics on pH but not buffer concentration. Als erste Produkte der Reaktion von Thiolen mit H2O2 werden Sulfensäuren angenommen. Diese zu beobachten und kinetisch und mechanistisch zu charakterisieren, ist allerdings ebenso schwierig, wie ihre weiteren Reaktionen zu verfolgen. Ein 9‐Fluortriptycen‐Substituent ermöglicht die 19F‐NMR‐spektroskopische direkte Analyse der Reaktion eines Thiols mit H2O2 zu einer Sulfensäure sowie der anschließenden Oxidationen zu Sulfin‐ und Sulfonsäuren.
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source Wiley Online Library Journals Frontfile Complete
subjects Acids
Chemistry
Hydrogen peroxide
Kinetics
Oxidation
Oxidationen
pH effects
Protein folding
Sulfenic acid
Sulfensäuren
Sulfinsäuren
Thiole
Thiols
Wasserstoffperoxid
title On the Reactions of Thiols, Sulfenic Acids, and Sulfinic Acids with Hydrogen Peroxide
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