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Abstract
Quantum chemistry and transition state theory were used to study 10 different radical reactions of peroxy radicals abstracting the phenolic hydrogen of several antioxidants. The B3LYP functional with a 6-31G(d) basis set was used to characterize transition states with as many as 20 heavy atoms. The impact of quantum tunneling was investigated for a representative reaction, and it was shown that the Wigner correction provides a good approximation to more advanced semi-classical transmission coefficients. A kinetic correlation was developed that is suitable for use in kinetic modeling, allowing antioxidant chemistry to be included in large mechanistic models of hydrocarbon oxidation.
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