G. I. Nikishin

Bio: G. I. Nikishin is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Radical & Homolysis. The author has an hindex of 11, co-authored 280 publications receiving 540 citations.

Remote oxidation of ketones to γ- and δ-diketones

Abstract: A single stage remote oxidation of ketones to γ- and δ-diketones has been carried out in a sodium peroxysulfate-iron(II) sulfate system.

Preparation of hydroperoxides from tetrahydrofuran and 2-methyltetrahydrofuran

Abstract: 1. The liquid-phase oxidation of tetrahydrofuran and 2-methyltetrahydrofuran with oxygen, in the presence of UV light, gave the hydroperoxides in respective concentrations of 20 and 60%. 2. The formed 2-methyltetrahydrofuran hydroperoxide is composed of two isomers: 2-methyl-2-peroxytetrahydrofuran and 2-methyl-5-peroxytetrahydrofuran.

Oxidation of secondary aliphatic amines in systems containing sodium peroxydisulfate

Abstract: 1. In the Na2S2O8-CuCl2 system, secondary aliphatic amines (RCH2CH2)2NH are transformed into 2-chloro- and 2,2-dichloroalkanals, alkanoic acids and their alkylamides; their most probable precursors are RCH2CH=NCH2CH2R azomethines, formed as a result of oxidative deprotonation. 2. In the Na2S2O8-NaCN-NaOH system, oxidation of dialkylamines by a mechanism of oxidative substitution with the formation of the products of N-cyanidation: cyanamides and ureas, and the products of N-hydroxylation, dialkylhydroxylamines, predominate.

Addition of acetaldehyde to 1-heptene initiated by catalytic oxidation

Abstract: 1. A method has been worked out for radical addition of acetaldehyde to 1-olefins, which is initiated by atmospheric oxygen in the presence of catalytic amounts of cobalt acetate. 2. Initiation of reaction is effected because of decomposition of intermediate products of aldehyde oxidation by the catalyst.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Cobalt-Catalyzed C―H Activation

Abstract: Catalytic C–H activation has emerged as a powerful tool for sustainable syntheses. In the recent years, notable success was achieved with the development of cobalt-catalyzed C–H functionalizations with either in situ generated or single-component cobalt-complexes under mild reaction conditions. Herein, recent progress in the field of organometallic cobalt-catalyzed C–H activation is reviewed until November 2015.

Catalytic Enantioselective Transformations Involving C-H Bond Cleavage by Transition-Metal Complexes.

Abstract: The development of new methods for the direct functionalization of unactivated C–H bonds is ushering in a paradigm shift in the field of retrosynthetic analysis. In particular, the catalytic enantioselective functionalization of C–H bonds represents a highly atom- and step-economic approach toward the generation of structural complexity. However, as a result of their ubiquity and low reactivity, controlling both the chemo- and stereoselectivity of such processes constitutes a significant challenge. Herein we comprehensively review all asymmetric transition-metal-catalyzed methodologies that are believed to proceed via an inner-sphere-type mechanism, with an emphasis on the nature of stereochemistry generation. Our analysis serves to document the considerable and rapid progress within in the field, while also highlighting limitations of current methods.