ISSN:
0030-4921
Schlagwort(e):
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Using the analysis of the splitting constants of the ESR spectra, factor are described which affect the stability of free phenoxyls and of phenoxyls co-ordinated on cobalt, generated by the reaction of tert-butyleperoxyls and 4,4′-biphenyldiols (1), 4,4′-thiobisphenols (2 and 5), 4,4′-dithiobisphenol 3a, the 4,4′-trithiobisphenol 3b, di(3,5-di-tert-butyl-4-hydroxybenzyl) sulphide (4a) and its corresponding sulphoné (4b). Phenoxy radicals are formed from compounds of type 1-4 in the presence and in the absence of oxygen. In the case of generation with oxygem complexed to cobalt, compounds 4, for steric reasons, form co-ordinated radicals of the cyclohexadienonyloxyl type. Free phenoxyls are also formed from 2a-2c, 3a and 3b as a result of the direct transfer of electrons from the sulphur non-bonding electron pair to the peroxidic bond of tert-butyl hydroperoxide in the absence of cobalt.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/mrc.1270140406
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