title: Hydroperoxyl Radicals (HOO.): Vitamin E Regeneration and H-Bond Effects on the Hydrogen Atom Transfer.
abstract: Hydroperoxyl (HOO.) and alkylperoxyl (ROO.) radicals show a different behavior in H-atom-transfer processes. Both radicals react with an analogue of α-tocopherol (TOH), but HOO., unlike ROO., is able to regenerate TOH by a fast H-atom transfer: TO.+HOO.→TOH+O2. The kinetic solvent effect on the H-atom transfer from TOH to HOO.is much stronger than that observed for ROO.because noncovalent interactions with polar solvents (Solv⋅⋅⋅HOO.) destabilize the transition state.
authors.affiliation: Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland.
authors.forename: Jakub
authors.initials: J
authors.lastname: Cedrowski
authors.affiliation: Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland. litwin@chem.uw.edu.pl.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Litwinienko
authors.affiliation: Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Baschieri
authors.affiliation: Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy. riccardo.amorati@unibo.it.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Amorati
keywords: hydrogen atom transfer; hydroperoxyl radicals; reactive oxygen species; solvent effects; tocopherol