Mechanisms of antioxidant action: Dialkyl ester thiotin PVC stabilizers as peroxide decomposers
✍ Scribed by B.B. Cooray; G. Scott
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 312 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
The reaction between tert-butyl hydroperoxide (TBH) and dioctyltinbis(isooctyl thioglycollate) (DOTG) in chlorobenzene was found to be first order in each reactant with an initial rapid stoichiometric stage followed by a slower catalytic peroxidolysis. The activation energy of the stoichiometric reaction was 73.1 kJ mol-t K -t. Analysis of the products of the reaction between cumene hydroperoxide (CHP) and DOTG revealed competing radical and ionic processes. In an oxidizable substrate (cumene), the CHP/DOTG interaction led to the exclusion formation of alcohol by hydrogen abstraction from the substrate in the initial stages; in the later stages, catalytic ionic decomposition of CHP was the predominant reaction.