| DOI | Trouver le DOI : https://doi.org/10.1021/ja954093+ |
|---|
| Auteur | Rechercher : Andersen, Mogens L.1; Rechercher : Mathivanan, N.1; Rechercher : Wayner, Danial D. M.1 |
|---|
| Affiliation | - Conseil national de recherches du Canada. Institut Steacie des sciences moléculaires du CNRC
|
|---|
| Format | Texte, Article |
|---|
| Résumé | The formal reduction potential (E°) of α-phenoxyacetophenone has been determined from the voltammetric peak potential obtained by linear sweep voltammetry in combination with the rate constant for fragmentation of the radical anion which had been determined by laser flash photolysis. The E° values of a number of α-aryloxyacetophenones were then estimated from a correlation of the ¹³C chemical shifts of the carbonyl carbon and a similar correlation (E° versus ¹³C chemical shift) within a series of substituted α-anilinoacetophenones. Using these potentials (which vary by only 34 mV over a wide range of substituents) the rate constants for fragmentation of the α-aryloxyacetophenone radical anions were determined from digital simulation of the corresponding voltammetric waves. The fragmentation rate constants were shown to correlate with the pKₐ of the corresponding phenols. However, the kinetic range was too small and the experimental errors too large to allow a distinction between a linear and quadratic free energy dependence. A thermochemical analogy between the leaving group ability in reactions of radical anions and that in simple heterolysis of closed shell compounds is developed. The utility of these compounds as potential electron transfer probes is discussed. |
|---|
| Date de publication | 1996 |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Numéro NPARC | 12338066 |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 42215396-cb19-4f14-ae62-bec5b8653217 |
|---|
| Enregistrement créé | 2009-09-10 |
|---|
| Enregistrement modifié | 2020-03-20 |
|---|
