| DOI | Trouver le DOI : https://doi.org/10.1021/j100341a094 |
|---|
| Auteur | Rechercher : Casal, H. L.1; Rechercher : Griller, D.1; Rechercher : Kolt, R. J.1; Rechercher : Hartstock, F. W.1; Rechercher : Northcott, D. M.1; Rechercher : Park, J. M.1; Rechercher : Wayner, D. D. M.1 |
|---|
| Affiliation | - Conseil national de recherches du Canada. Institut de technologie des procédés chimiques et de l'environnement du CNRC
|
|---|
| Format | Texte, Article |
|---|
| Résumé | Photolysis of single crystals of urea/diacyl peroxide complexes at 10 K gave pairs of alkyl radicals that were separated by two molecules of carbon dioxide. At elevated temperatures the spectra became well-resolved as rotation of the radical centers became fast on the EPR time scale. The maximum resolution of the EPR hyperfine couplings was achieved when the separation between the radicals was greatest. The temperature for the onset of rapid rotation was markedly dependent on the length of the diacyl peroxide. Two radical rearrangements in the urea channels were studied: the cyclopropylmethyl ring opening and the 5-hexenyl radical cyclization. The former was virtually unaffected by the presence of the urea host while the cyclization of the 5-hexenyl radical showed a marked matrix effect. |
|---|
| Date de publication | 1989-02-23 |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Publications évaluées par des pairs | Oui |
|---|
| Numéro NPARC | 12338592 |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | cd55f102-ac3a-446a-96b8-b13cd79bff5f |
|---|
| Enregistrement créé | 2009-09-10 |
|---|
| Enregistrement modifié | 2020-03-17 |
|---|
