Comparative Study of the Reactivity of Iodinating Agents in Solution and Solid Phase

The results of reactions of a series of aromatic substrates with iodine, iodine(I) chloride, and N-iodosuccinimide in solution and solid phase were compared for the first time. In all cases, the general relations holding in the iodination process were similar. Iodine(I) chloride was found to chlorinate anthracene. A high efficiency of solid-phase iodination of β-diketones was demonstrated using dibenzoylmethane as an example.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 6, 2005, pp. 876–880.Original Russian Text Copyright © 2005 by Krasnokutskaya, Lesina, Gorlushko, Filimonov.     

Solvent‐Free Iodination of Arenes using Iodine–Silver Nitrate Combination

A simple and environmentally safe general method of iodination of aromatic substrates under sovent‐free conditions using the I₂/AgNO₃ combination in a solid state is reported. Both activated and deactivated aromatic compounds afford the respective aryl iodides in generally high yields (80–90%).     

Pyridinyl trifluoromethanesulfonates: preparation methods and use in organic synthesis

The methods for the synthesis of pyridinyl trifluoromethanesulfonates are reviewed. Examples of their use in organic synthesis for the production of valuable products are presented.     

Latent ruthenium carbene complexes with six-membered N- and S-chelate rings

New ruthenium carbene complexes with chelating N- and S-benzylidene ligands were synthesized by the reactions of second- and third-generation Grubbs catalysts with ortho-vinylbenzyl-substituted amines or sulfides. These complexes were shown to exhibit catalytic activity in ring-opening metathesis polymerization and ring-closing metathesis.     

Generation of Electrophilic Iodine from Iodine Monochloride in Neutral Media. Iodination and Protodeiodination of Carbazole

In reaction of iodine monochloride with CF₃COOAg, CH₃COONa or (CH₃COO)₂Pb in acetonitrile and acetic acid the chloride is bonded by metal cations, and electrophilic iodine is generated able to easily iodinate anthracene and carbazole. However at the iodination of anthracene in the presence of oxygen the prevailing process is anthracene oxidation to anthraquinone. In the presence of sulfuric acid protodeiodination of 3-iodocarbazole was found to occur resulting in rearranged products.     

Azaindole derivatives

An increase in the C-N bond strength in a series of N-alkyl substituents (methyl < ethyl < hexyl < butyl) was established from a study of N-dealkylation processes during the synthesis of substituted 7-azaindoles from 2,6-dichloro-3-(-chloroethyl)-4-methylpyridine and unsymmetrical alkylbutylamines.See [1] for Communication XXXV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1546–1549, November, 1970.     

Azaindole derivatives

As in the case of N-substituted anilines, trichlorocollidine forms 6-chloro-7-azaindoline derivatives rather than 6-amino-7-azaindoline derivatives with sterically hindered primary amines of the β-phenylisopropylamine type. On passing to tert-butylamine, nucleophilic attack at the α and α′ positions of the pyridine ring proves to be sterically impossible, and dehydrohalogenation of trichlorocollidine to 2,6-dichloro-3-vinyl-4-methylpyridine becomes the principal reaction.     

A Novel One-Pot Synthesis of N,N-Dimethylaminopyridines by Diazotization of Aminopyridines in Dimethylformamide in the Presence of Trifluoromethanesulfonic Acid

Russian Journal of Organic Chemistry - Diazotization of aminopyridines in the presence of trifluoromethanesulfonic acid gives the corresponding pyridinyl trifluoromethanesulfonates instead of...     

A two-dimensional problem for an anisotropic body with a finite number of “tunnel” cracks

We give the results of studies of the stress state for an infinite anisotropic body with a number of planar cracks along a single plane. For the simplest types of load we prove that the stress intensity factors is independent of the type of anisotropy. We describe the results of numerical studies as functions of the geometric characteristics of the body. Translated fromTeoreticheskaya i Prikladnaya Mekhanika, No. 23, 1992, pp. 27–34