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 …

I and i

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Ru-, Rh-, and Pd-Catalyzed C-C Bond Formation Involving C-H Activation and Addition on Unsaturated Substrates: Reactions and Mechanistic Aspects

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.

Cobalt-Catalyzed C―H Activation

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.

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

Oxidative decarboxylation of carboxylic acids with lead tetraacetate has been studied in detail. Numerous repre� sentatives of aliphatic, alicyclic, and arylaliphatic acids were examined in this reaction. 2 The use of Pb(OAc) 4 and the Pb(OAc) 4 —I, Pb(OAc) 4 —Cu(OAc) 2 , and Pb(OAc)4—MHal oxidizing systems (M is alkali metal) opens new ways of transforming acids into unsaturated hydrocarbons and halohydrocarbons. Oxidative decar� boxylation was carried out in a liquid phase generally at high temperature with the use of solvents (benzene, dichloromethane, acetic acid, etc.). We were the first to use Pb(OAc)4 as an oxidizer in the

monoand dicarboxylic acids with the Pb(OAc) 4 —MCl system*

A method was developed for the introduction of a 4-oxoalkyl substituent into the pyridine ring by the reaction of protonated methylpyridines with acetone and 1-alkenes by the action of Mn(III) acetate.

The homolytic oxoalkylation of methylpyridines by the action of Mn(III) acetate

A New Approach to Arylaliphatic 1,5‐, 1,6‐, and 1,7‐Dicarbonyl Compounds and Their Monoacetals Based on Direct Anodic Oxidation of 1‐ Phenyl‐ and Benzo(c)cycloalkenes.

G. I. Nikishin

Papers

monoand dicarboxylic acids with the Pb(OAc) 4 —MCl system*

The homolytic oxoalkylation of methylpyridines by the action of Mn(III) acetate

A New Approach to Arylaliphatic 1,5‐, 1,6‐, and 1,7‐Dicarbonyl Compounds and Their Monoacetals Based on Direct Anodic Oxidation of 1‐ Phenyl‐ and Benzo(c)cycloalkenes.

Oxalyl Complexes in Organic Synthesis

Homolytic rearrangement with migration of a hydrogen atom and a cyano group during the oxidation of α-cyanoalkanols