New insights into the oxidative electrochemistry of vitamin E

Article Abstract:

Experiments have shown that the [alpha]-, [beta]-, [gamma]- and [delta]-forms (vitamers) of the tacopherols (vitamin E) have undergone series of chemically reversible proton- and electron-transfer steps in dry organic solvents to form cationic compounds. The cationic compounds are found to be unusual in their high persistence when compared to the oxidative stability of other phenols, which is stable for at least several hours in non-aqueous solvents.

Vitamin E, Electron transport, Voltammetry

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Bond strengths of toluenes, anilines, and phenols: to hammett or not

Article Abstract:

Free radicals chemists have a strong and abiding interest in the bond dissociation enthalpies. The overall enthalpy change in a homolytic reaction is determined by the bond dissolution enthalpies (BDEs) of the bonds being made and broke and it is the overall enthalpy change that determines whether the reaction will be exothermic or endothermic.

Chemical bonds, Enthalpy, Atomic properties, Thermal energy

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Solvent effects on the rates and mechanisms of reaction of phenols with free radicals

Article Abstract:

The hydrogen-bond-accepting and anion-solvation abilities of solvents, the electron affinities and reactivities of radicals, and the phenol's ring substituents affect the rate of formal abstraction of phenolic hydrogen atoms by free radicals. The chief characteristics of the mechanisms governing them and their kinetic outcomes are presented.

Hydrogen bonding, Hydrogen bonds, Solvation, Mechanical properties, Kinetic energy

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