Chem. 63, 3203 (1985). Nous avons fait rCagir dans le dichloromethane les ozonides de plusieurs phosphites sur differents capteurs d'oxygkne singulet ('0,): le rubrkne 2, la tCtraphenylcyclopentadienone 4 et le diphenyl-9.10-anthrackne 6. Ces ozonides riagissent lors de leur dCcomposition (-47°C < t < 30°C) sur ces capteurs. Les droitcs de Foote obtenues en faisant varier les concentrations respectives d'ozonides et de capteurs conduisent aux mtmes parametres que ceux obtenus lors de la photooxydation par '0, de ces capteurs. Cela confirme I'aptitude de ces ozonides B engendrer 'O?. La valeur trouvCe du rendement absolu en 'O? est de 100% (p = 1). Les rtsultats confirment aussi la grande efficacitd "is-B-vis de '0, du rubrene (y = 1) et la valeur moyenne de la tCtraphCnylcyclopentadienone (y = 0,46). La valeur faible (y = 0.3) de I'efficacitC du diphtnyl-9,lO-anthrackne 4 est par contre inattendue.ANNE MARIE CAMINADE, FAYEZ EL KHATIB, MAX KOENIG, and JEAN MARIE AUBRY. Can. J. Chem. 63, 3203 (1985). The ozonides of several phosphites in solution in dichloromcthane have been reacted with some scavengers of singlet oxygen ('04 like rubrene (2), tetraphenylcyclopentadienone (4). and 9,IO-diphenylanthracene (6). These ozonides react on the scavengers (-47°C < t < 30°C) upon their decomposition. The Foote curves obtained by varying the respective concentrations of ozonides and of scavengers lead to parameters similar to those obtained upon the photooxidation of the scavengers by 'Oz.Results confirm that these ozonides can lead to the formation of lo2. The absolutc yield of 'Oz is 100% (p = I). These results also confirm the high efficiency of the rubrene toward '02 (y = I ) and the lower efficiency of the tetraphenylcyclopentadienone (y = 0.46). However, the low value (y = 0.3) for the efficiency of the 9,lO-diphenylanthracene (4) is unexpected.[ ' Auteurs B qui adresser la correspondance.
ResultatsNous avons fait reagir dans le dichloromCthane les differents ozonides la-cl sur trois capteurs classiques d'oxygkne sin-
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