Elementary stages and kinetics of phenoxide radicals reactions with cobalt and iron ions

Introduction of cobalt acetylacetonate to the solution containing phenoxide radicals has led todecelerating their termination. Cobalt acetylacetonate reactivity is dual, it has acted as an inhibitor when introduced in a certain concentration to the low-temperature oxidizing mixture.     

Mechanisms of Photoreactions of 2,6-Diphenyl-1,4-benzoquinone and Its Dimer in Different Solvents

Russian Journal of Physical Chemistry A - An investigation of 2,6-diphenyl-1,4-benzoquinone (a class of substituted benzoquinones) and its dimer is performed to study the effect the solvents have...     

Complexing of benzosemiquinone radicals with bivalent copper ions

Russian Journal of General Chemistry -     

Reactions of flavosemiquinone radicals in the presence of metal ions

The rate constants of disproportionation of flavosemiquinone radicals were obtained by pulsed spectroscopy. The yield of the flavosemiquinone radical increased when Mohr’s salt was introduced in the aqueous solutions of riboflavin. The spectral kinetic characteristics of complexes of flavosemiquinone radical anions with Zn²⁺ and Cd²⁺ ions were determined.     

Development of Chemical Polarization of Nuclei During Photolysis of Benzoquinones with Aromatic Amines

Formation of nuclei polarization via triplet mechanism has been observed and described, allowing reliable identification of ion-radicals stages of the reaction, estimation of the triplets and ion-radical pairs lifetime from the effects of chemical polarization of the nuclei. The data on relative values of isotropic and anisotropic interactions of unpaired electrons and nuclei have been obtained.     

Mechanisms of photochemical reactions of <Emphasis Type="Italic">para</Emphasis>-benzoquinones with thiols

The mechanisms of quinone reduction by thiols containing α-hydrogen atoms were established using chemically induced dynamic nuclear polarization effects. It was found that substituents in the quinone nucleus change the nature of the primary radical pair. In the photolysis of 2,6-dimethyl-1,4-benzoquinone (1), the radical pair consists of semiquinone and thioalkyl radicals, whereas in the case of 2,6-diphenyl-1,4-benzoquinone (2), the radical pair is composed of semiquinone and thiyl radicals. Quinone 2 is readily photolyzed with any thiol to give dibenzofuran derivative as the final products.