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Understanding Redox Reactions Leading to Water Formation

Explore the intricate pathways of redox reactions from O2 to H2O, including the involvement of H2O2, OH radicals, Fenton's reaction, and organic peroxides. Learn about the Haber-Weiss and Fenton's reactions and the role of transition metal ions in ROS reactions.

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Understanding Redox Reactions Leading to Water Formation

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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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