ISSN:
1573-1111
Schlagwort(e):
β-cyclodextrin radicals
;
benzoyl peroxide
;
cumene hydroperoxide
;
t-butyl peroxide
;
peroxide stabilization
;
electron paramagnetic resonance (EPR)
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Studies by electron paramagnetic resonance (EPR), differential scanning calorimetry, thermogravimetric analysis, HPLC and NMR showed that radicals produced by thermolysis and photolysis of benzoyl peroxide,t-butyl peroxide and cumene hydroperoxide included inβ-cyclodextrin (β-CD), undergo significant reaction with theβ-CD. The formation ofβ-CD radicals was observed by EPR. Products formed by addition of radicals toβ-CD were also observed. Such host:guest radical reactions explain the reported stabilization of peroxides, found withβ-CD inclusion, as being primarily due to the interruption of chain reactions by trapping of the chain carriers. A small increase in activation barrier for cleavage of the included peroxide inβ-CD was also observed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00707888
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