Two quick examples. Dehydration I could be having a senior moment, but I think that you mistakenly gave the wrong values. water in the atmosphere) and forms iron(III) oxides. The transfer of oxygen from N-sulfonyloxaziridines to nucleophiles google_ad_format = "120x600_as"; It’s a bookkeeping tool (and a useful one), but depending on how you use it, it can be confusing. Mechanism Diels-Alder Reaction: Kinetic and Thermodynamic Control, Electrocyclic Ring Opening And Closure (2) - Six (or Eight) Pi Electrons, Regiochemistry In The Diels-Alder Reaction, "Is This Molecule Aromatic?" Finally, carbonates, carbamates, and carbon dioxide are all at the ‘most oxidized oxidation level. Each bond to an element of lower electronegativity than C counts as +1. Fortunately for him, I wasn’t fast or clever enough to counter with “then why isn’t “oxidation” called “addition”? DOI: 10.1021/jo201972k. Mechanism :: Electrophilic Synthesis of α-hydroxycarbonyl compounds (acyloins): direct oxidation of enolates using 2-sulfonyloxaziridines Regards, Dietmar. If you just pay attention to what’s happening to the oxidation state of the carbons, you can follow along to see if it’s an oxidation or reduction. Thanks for such a detailed response. See how oxidation leads to removal of electrons, and reduction leads to a gain of electrons. Hi James – In your last four structures, how did you calculate the magnitude of the oxidation states for the carbon atoms? Chem. Why Are Endo vs Exo Products Favored in the Diels-Alder Reaction? 14. 6 - Lewis Structures, A Parable, From Gen Chem to Org Chem, Pt. The Third Most Important Question to Ask When Learning A New Reaction, 7 Factors that stabilize negative charge in organic chemistry, 7 Factors That Stabilize Positive Charge in Organic Chemistry, Common Mistakes: Formal Charges Can Mislead, Curved Arrows (2): Initial Tails and Final Heads, Leaving Groups Are Nucleophiles Acting In Reverse, Three Factors that Destabilize Carbocations, Learning Organic Chemistry Reactions: A Checklist (PDF), Introduction to Free Radical Substitution Reactions, Introduction to Oxidative Cleavage Reactions, Bond Dissociation Energies = Homolytic Cleavage. google_ad_type = "text"; Ying-Ying Li, Lian-Peng Tong, Rong-Zhen Liao, Mechanism of Water Oxidation Catalyzed by a Mononuclear Iron Complex with a Square Polypyridine Ligand: A DFT Study, Inorganic Chemistry, 10.1021/acs.inorgchem.8b00333, 57, 8, (4590-4601), (2018). Diels-Alder Reaction,