Artículo
Forlano, P.; Olabe, J.A.; Magallanes, J.F.; Blesa, M.A. "The mechanism of oxidation of 3-mercaptopropionic acid" (1997) Canadian Journal of Chemistry. 75(1):9-13
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Abstract:
The mechanism of the oxidation of 3-mercaptopropionic acid (3-MPA) by hydrogen peroxide was studied in the acidic pH range. The nucleophilic attack by sulphur on the peroxide bond controls the rate. Extrapolation of the pH dependency suggests that the rate of attack by the deprotonated dianion is highest. Traces of Fe(III), at levels below 10-7 mol dm-3, do not catalyze efficiently the process through one-electron mechanisms; at higher concentrations, or on the surface of iron(III) oxides, this type of catalysis becomes important. The electrochemical oxidation of 3-MPA was also studied, using differential pulse polarography and cyclic voltammetry techniques. The mechanism is of the EC2E type, the second electron transfer step corresponding to the oxidation of the disulphide RS-SR. The rate constant for the dimerization of the RS. radicals was 1.8 × 103 mol-1 dm3 s-1; the slowness of this step agrees with the mechanisms observed in the course of one-electron oxidations by metal ions.
Registro:
| Documento: | Artículo |
| Título: | The mechanism of oxidation of 3-mercaptopropionic acid |
| Autor: | Forlano, P.; Olabe, J.A.; Magallanes, J.F.; Blesa, M.A. |
| Filiación: | Inst. Quim. Fis. Mat., Medio A., Depto. de Quim. Inorgánica, Ciudad Universitaria, 1428 Buenos Aires, Argentina Unidad de Actividad Química, Comn. Nac. de Ener. Atómica, Avenida del Libertador 8250, 1429 Buenos Aires, Argentina |
| Palabras clave: | 3-mercaptopropionic acid; Autooxidation; Electrochemistry; Kinetics; Catalysis; Charge transfer; Cyclic voltammetry; Electrochemistry; Electrons; Hydrogen peroxide; Iron compounds; Organic acids; pH; Polarographic analysis; Reaction kinetics; Autooxidation; Deprotonated dianion; Mercaptopropionic acid; Nucleophilic attack; Second electron transfer step; Oxidation |
| Año: | 1997 |
| Volumen: | 75 |
| Número: | 1 |
| Página de inicio: | 9 |
| Página de fin: | 13 |
| DOI: | http://dx.doi.org/10.1139/v97-002 |
| Título revista: | Canadian Journal of Chemistry |
| Título revista abreviado: | Can. J. Chem. |
| ISSN: | 00084042 |
| CODEN: | CJCHA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00084042_v75_n1_p9_Forlano |
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Citas:
---------- APA ----------
Forlano, P., Olabe, J.A., Magallanes, J.F. & Blesa, M.A. (1997) . The mechanism of oxidation of 3-mercaptopropionic acid. Canadian Journal of Chemistry, 75(1), 9-13.http://dx.doi.org/10.1139/v97-002
---------- CHICAGO ----------
Forlano, P., Olabe, J.A., Magallanes, J.F., Blesa, M.A. "The mechanism of oxidation of 3-mercaptopropionic acid" . Canadian Journal of Chemistry 75, no. 1 (1997) : 9-13.http://dx.doi.org/10.1139/v97-002
---------- MLA ----------
Forlano, P., Olabe, J.A., Magallanes, J.F., Blesa, M.A. "The mechanism of oxidation of 3-mercaptopropionic acid" . Canadian Journal of Chemistry, vol. 75, no. 1, 1997, pp. 9-13.http://dx.doi.org/10.1139/v97-002
---------- VANCOUVER ----------
Forlano, P., Olabe, J.A., Magallanes, J.F., Blesa, M.A. The mechanism of oxidation of 3-mercaptopropionic acid. Can. J. Chem. 1997;75(1):9-13.http://dx.doi.org/10.1139/v97-002
