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a) The “four” electron reduction reactions leading from O 2 to H 2 O

● -. -. ●. e. +. 1) O 2 +. (+ H HO 2 ). a) The “four” electron reduction reactions leading from O 2 to H 2 O. O 2. ● -. -. 2) +. e. (O 2 2- + 2H + ) H 2 O 2. O 2. -. -. -. ●. 3) +. H 2 O 2. e. e. OH + OH. 4) OH +. +. H 2 O.

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a) The “four” electron reduction reactions leading from O 2 to H 2 O

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  1. ●- - ● e + 1) O2 + (+ H HO2 ) a) The “four” electron reduction reactions leading from O2 to H2O O2 ●- - 2) + e (O22- + 2H+) H2O2 O2 - - - ● 3) + H2O2 e e OH + OH 4) OH + + H2O + H ●- 2O2 b) Reactions involving H2O2 5) dismutation + H H2O2 + O2 + homolytic scission ● 6) H2O2 2 OH ●- Haber-Weiss reaction + 7) H2O2 + O2 ● OH + OH + O2 Fenton’s reaction (Fe2+ - dependent Haber-Weiss reaction) - ● 8) Fe2+ + H2O2 Fe3+ + OH + OH ●- 9) Fe3+ + H2O2 + Fe2+ + O2 + 2H ●- + H2O + H + O2 10) OH+ H2O2 ● ●- 11) Fe3+ + O2 Fe2+ + O2 - ● Fe3+ + OH 12) Fe2+ + OH c) Reactions of ROS in the presence of transition metal ions d) Carbon-centered free radicals generated by interactions with ROS ● ● 13) R – H + OH R + H2O organic radical ● peroxyl radical ● 14) R + O2 ROO ● organic peroxide 15) ROO + R - H ROOH + R ● - alkoxyl radical RO + OH + Fe3+ 16) ROOH + Fe2+ ●

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