Synthesis of heterocyclic bromacetylene alcohols and their acryl -, methacryl ethers

The article presents a method for obtaining heterocyclic bromoacetylenic alcohols by the action of sodium hypobromide on cyclic and heterocyclic acetylene alcohols, as well as their acrylic and methacrylic esters using lithium aluminum complexes. The composition and structure of the obtained products were confirmed by the data of elemental analysis, IR and PMR spectra. As a result of the study, it was found that in the presence of lithium aluminum hydride, the product yield in all cases is higher than 80 %.

MECHANISMS OF FORMATION AND STRUCTURE POLYMER SALTS OF DIMETHYLAMINOETHYL METHACRYLATE WITH HETEROCYCLIC COMPOUNDS

The article presents the results of studies of the main regularities of the polymerization of quaternary monomeric salts of dimethylaminoethylmethacrylate with heterocyclic compounds - N-α-chloromethylbenzoxazolone, N-α-bromomethylmercaptobenzthiazolthione and N-α-chloromethylbenztriazole, determined experimentally the values ​​of the kinetic process parameters. The structure and composition of the newly synthesized monomers and polymers were studied using PMR spectra and elemental composition analysis. The processes of polymerization of monomeric salts based on DMA and heterocyclic compounds were studied, the main kinetic regularities of the reactions were established, and it was shown that the system under study obeys the basic laws of the radical process, which is confirmed by the compilation of a mathematical model of the formal kinetics of the reaction. A mathematical model of radical polymerization was compiled, on the basis of which the ordinal values ​​and activation energy of the reaction were determined and the results were obtained that were adequate with the experimental ones.

Development of oil industry in Azerbaijan

Considering the naphthenic-paraffin nature of the oil fractions of Balakhany oil, the paper presents the results of studies on the use of fully and partially dearomatized oil fractions of this oil as base oils, as well as their use in a mixture with base hydrocracked oil – VHVI, used in amounts of 25-50 %. The PMR spectra of the starting and obtained oils were recorded. The possibility of obtaining semi-synthetic high-stability motor oil SAE 15W-40 by using a mixture of T-46 and high-index hydrocracking oil (VHVI-4) 68 % (T-46 – 65 % + VHVI-4 – 35 %) + additive package was shown Lubrizol – 32 %, which is not inferior in antioxidant properties to the semi-synthetic oil SAE15W-40, containing as a base component a mixture of T-46 oils – 40 % + hydrocracking VHVI-4 – 32 % + selective oil SN-600 – 20 % + package additives of Belarus, as well as pure synthetic oil SAE 15W-40, containing SN-180 – 38 %, VHVI-4 – 27 % concentrate + Lubrizol – 35 %.

Configuration and isomeric composition of rubbers: determination by 1H and 13C NMR spectroscopy

Nuclear magnetic resonance (NMR) spectroscopy is a convenient method for studying the structure and isomeric composition of diene rubbers. A simple and reproducible method is proposed for determining the content of both rubber and impurity compounds, which does not require additional sample preparation. Formulas for calculating the composition of industrial products and determining the initial substances are given, the applicability of the analysis method is confirmed. In the process of work, rubbers of various brands were analyzed, their configuration-isomeric composition was established. It was found that the integration ranges given in the literature earlier and the methods for processing 1H NMR spectra differ, the signals of the groups often overlap in the spectrum, which increases the calculation error. It is shown that the structure of the industrial products under study is established most accurately by carbon proton resonance spectroscopy, and the calculation based on the PMR spectra allows confirming the data obtained with sufficient accuracy.

SYNTHESIS OF ESTERS OF HALOGENOACETIC ACIDS

Amidoalkylating reagents containing a phthalimide group are used in the synthesis of hard-to-reach primary amines and complex heterocyclic compounds. These types of amidoalkylating compounds are suitable reagents for nucleophilic substituted reactions in acidic media due to their resistance to acids. Result of reactions of amidoalkylating reagents-N-hydroxyethylphthalimide and N-hydroxymethylphthalimide with aliphatic carbonic acids can also produce new bactericidal and fungicidal esters. In this study, halogen acids reacted with N-hydroxymethylphthalimide monochloric acetic acid, monobromic acetic acid, monoiodic acetic acid, trifluoric acetic acid and trichloroacetic acid, as well as, N-b-hydroxyethylphthaleidyl monohydric acid. As a result of the reactions, new phthalimidomethyl and phthalimidoethyl esters of haloacetic acids were synthesized. The physical properties of crystalline esters have been determined. The structure of these compounds were confirmed by the analysis of their IR and PMR spectra. The esterification reactions of halogenated acetic acids were carried out in a benzene solvent and a sulfuric acid catalyst with primary alcohols, N-hydroxymethylphthalimide and N-β- beta hydroxyethylphthalimide,. It was found that in a benzene solvent, which increases the rate of bimolecular nucleophilic exchange in primary alcohols, phthalimidoethyl esters of halogen acid are formed in high yields, and phthalimidomethyl esters are formed in low yields. It was shown that the reaction of esterification of halogen acids with N-hydroxymethylphthalimide proceeds with monomolecular nucleophilic exchange.

Особенности локальной динамики и ориентационного состояния жесткоцепных жидкокристаллических полимеров

Proton magnetic resonance (PMR) spectra and terahertz IR spectra of Vectra A950 fibers and granules and Armos fibers before and after heat treatment were obtained and analyzed in order to understand the molecular mobility mechanisms that ensure the self-organization and restructurization of these rigid-chain liquid-crystal polymers, as well as their similarity and difference. It is shown that large-scale thermal (quasi-segmental) mobility in such LC polymers is due to the reptation of macromolecules with respect to each other and the conformational transitions necessary for the motion of chains in them are the result of random accumulation of displacements that occur during local bending and torsional-vibrational movements in the links of polymer chains according to the Bresler–Frenkel mechanism.

Synthesis and Characterization of Some Group 12 Metal Complexes with Tellurium Containing 10-Membered Tetraazamacrocyclic Ligands

A new series of 10-membered tellurium containing tetraazamacrocyclic complexes, [ML1Cl2], [ML2Cl2] and [ML3Cl2], where [M=Zn(II), Cd(II), Hg(II); L1, L2and L3=10-membered tellurium containing tetraazamacrocyclic ligands] have been prepared via the template condensation of ethylenediamine and diaryltellurium dichlorides, R2TeCl2, (R=p-hydroxyphenyl, 3-methyl-4-hydroxyphenyl,p-methoxyphenyl) in the presence of metal chlorides. These complexes have been characterized by elemental analyses, conductivity measurements, infrared, electronic absorption and proton magnetic resonance spectral studies. IR and PMR spectra confirm the formation of 10-membered tetraazamacrocycle skeleton and their tetradentate nature. An octahedral geometry has been assigned to all the metal complexes on the basis of various physicochemical studies.