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Kinetics and Mechanism of Oxidation of Methionine by Chromium(VI): Edta Catalysis

Subbiah Meenakshisundaram ; Department of Chemistry, Annamalai University, Annamalainagar – 608 002, India
Rajagopal Vinothini ; Department of Chemistry, Annamalai University, Annamalainagar – 608 002, India


Puni tekst: engleski pdf 92 Kb

str. 75-80

preuzimanja: 737

citiraj


Sažetak

The kinetics of the oxidation of DL-methionine to sulfoxide by CrVI has been studied in aqueous acetic acid in the presence of sodium salt of ethylenediaminetetraacetic acid (edta). It appears that CrVI-edta is the active electrophile. The low dielectric constant of the medium favours the reactivity. Ionic strength and MnII have no significant effect on the conversion. The ratio k(D2O) / k(H2O) ≈ 1 does not seem to indicate any significant solvent isotope effect. Highly negative ΔS# values indicate a structured transition state. A ternary intermediate has been envisaged for describing the enhanced reactivity.

Ključne riječi

kinetics, oxidation, edta catalysis, methionine, chromium(VI)

Hrčak ID:

103071

URI

https://hrcak.srce.hr/103071

Posjeta: 1.065 *