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CHEMISTRY

ISSN 2227-6017 (ONLINE), ISSN 2303-9868 (PRINT), DOI: 10.18454/IRJ.2227-6017
ПИ № ФС 77 - 51217, 16+

SYNTHESIS OF DECAHYDROACRIDINION DIOXIME

Posted in 2019, CHEMISTRY, Issue № 5(83) May 2019 | 0 comments

The work considers the reactions of oximatization of 9- (3,5-di-tret-butyl-4-hydroxyphenyl)-3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydroacridine-1,8(2H, 5H)-dione. It was found that the attack of nucleophilic reagents on carbonyl groups into hexahydroacridin-1,8(2H, 5H)-diones proceeds with preservation of the 1,4-dihydropyridine fragment and the formation of mono- and disubstituted derivatives. The structure of the starting 9- (3,5-di-tret-butyl-4-hydroxyphenyl) -3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydro-acridine-1,8 (2H, 5H)-dione and its dioxime confirmed by 1H NMR spectroscopy.

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SCIENTIFIC AND PRACTICAL ACTIVITY OF L.E. OLIFSON IN THE YEARS OF THE GREAT PATRIOTIC WAR

Posted in 2019, CHEMISTRY, Issue №4(82) April 2019 | 0 comments

The scientific and practical activities of the Honored Scientist of the RSFSR, PhD in Biology, Professor L.Ye. Olifson, aimed at helping the front and rear area during the Great Patriotic War is presented in the article. His initial research on the release of previously unknown toxic substances which are the cause of alimentary-toxic aleukia is analyzed and their structure is established. The contribution of a scientist in the field of mycotoxin chemistry is described. His role in solving the problem of alimentary-toxic aleukia is shown.

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PVC COMPOSITIONS AND THEIR APPLICATION

Posted in 2019, CHEMISTRY, Issue №2(80) February 2019 | 0 comments

Polyvinyl chloride compositions are intermediates for the production of various types of products. Depending on their composition, they are divided into soft and hard ones. PVC compositions always contain heat stabilizers and lubricants, as well as impact modifiers, which are designed to absorb impact energy of plastic deformation. They are most widely used in the manufacture of hoses, furniture and tiles. The aim of the work is to analyze PVC compositions and their application.

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AERODYNAMIC EXTRACTION OF ALUMINOSILICATE DISPERSED NARROW FRACTIONS FROM FLY ASH OF EKIBASTUZ COAL AND THEIR CHARACTERISTICS

Posted in 2018, CHEMISTRY, Issue №12(78) December 2018 | 0 comments

A nonmagnetic narrow fraction of dispersed particles with an average diameter of 2, 3, 6 and 10 microns from the fly ash was isolated from dust-like combustion of Ekibastuz coal by the method of aerodynamic classification followed by magnetic separation. It is established that with an increase in the size of fractions the bulk density monotonously increases from 0.90 to 1.07 g/cm3. The main components of the chemical composition of the dispersed narrow fractions are SiO2 – 65-70 wt. % and Al2O3 – 23-28 wt. %. The phase composition includes 64-69 wt. % glass phase, 17-21 wt. % phase of mullite, 10-18 wt. % of quartz. The particle size distributions are characterized by the following values d50 – 1.9; 2.3; 5.1; 9.2 microns and d90 – 4.5; 5.7; 11.4 and 16.7 microns, respectively. The main morphological types of particles are microspheres with a non-porous smooth surface and microspheres with a porous shell; as the size of fractions increases, the amount of microspheres with a porous shell increases.

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STUDY OF DIFFERENT SYSTEMS APPLICATION FOR SUNFLOWER OIL OXIDATION

Posted in 2018, CHEMISTRY, Issue №12(78) December 2018 | 0 comments

The article contains data on the composition of waste of oil extraction production. The process of oxidation and polymerization of sunflower oil is considered. A series of experiments of the oxidation process in a chemical reactor is carried out. The products of the research allow obtaining composite materials for various purposes, surfactants, emulsifiers, emollients and lubricants from hazardous waste oil extraction production.

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STERIC ASPECT IN THREE-STAGE SYNTHESIS OF SEX PHEROMONE OF HOUSEFLY (MUSCA DOMESTICA L.) CIS-9-TRICOZENE

Posted in 2018, CHEMISTRY, Issue №12(78) December 2018 | 0 comments

The housefly Musca domestica L is a synanthropic insect and is very dangerous to human health and pets. Sex pheromones of insects are actively used to develop and create effective means of protection. The article studies non-trivial approaches of fine organic synthesis, which allows reducing the number of stages in the preparation of pheromones. A three-stage approach to the synthesis of cis-9-tricozenes, the sex pheromone of the housefly Musca domestica L, was tested [1, P. 2792]. Synthesis of (quinolin-8-yl) -cis-9-octadecenoate is carried out and its physicochemical properties are studied. The analysis of steric hindrances in the preparation of ketones from esters and Grignard reagents was conducted.

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SYNTHESIS AND RESEARCH OF HETEROGENEOUS CATALYSTS BASED ON TETRASULPHOPHTHALOCYANINE COBALT AND MODIFIED MONTMORILLONITE

Posted in 2018, CHEMISTRY, Issue №11(77) November 2018 | 0 comments

The article studies the adsorption of tetrasulfophthalocyanine cobalt (TSFC) from aqueous solutions on the natural (in the Na form) and modified by aluminum hydroxo complexes [Al13O4 (OH) 24 (H2O) 12] 7+ montmorillonite (Na-M and Al-M, respectively). It is established that the magnitude and nature of adsorption depend on the nature of the carrier. On Na-M, adsorption of TSFC is reversible, while 0.7 mg of TSFC/g Al-M adsorbs irreversibly. It is shown that irreversibly adsorbed TSFC is fixed on the surface of Al-M in monomeric form using diffuse reflectance spectroscopy. It was established that the solid fixing of TSFC on Al-M does not lead to a decrease in its activity in the oxidation reaction of a solution of sodium sulfide with oxygen: TSFC fixed in monomeric form on the carrier in the solution in the form of monomers have the same activity.

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USAGE OF SOLID-PHASE EXTRACTION METHOD FOR PURIFICATION OF 16-α[18F]FLUORINE-17β-ESTRADIOL, A RADIOTRACER FOR PET DIAGNOSTICS OF BREAST CANCER

Posted in 2018, CHEMISTRY, Issue №6(72) June 2018 | 0 comments

A new method of solid-phase extraction (SPE) for the purification of 16α-[18F]fluorine-17β-estradiol ([18F]FES), radiopharmaceutical (RPC) for PET diagnostics of estrogen-positive (ER +) breast cancer is proposed. [18F]FES was obtained by nucleophilic radiofluorination of the cyclic sulfanyl precursor MMSE with subsequent deprotection by hydrolysis in an acidic medium. In order to separate [18F]FES from the reaction mixture by SPE method, disposable cartridges based on various sorbents have been studied. It was shown that the use of the OASIS WAX 3cc cartridge is the most effective and allows to obtain [18F]FES with radiochemical purity > 99% and the residual content of MMSE and chemical impurities of 2-5 μg/ml, which allows using this RPC in preclinical and clinical studies. The content of ethanol in the injection form of the drug is 5%, which meets the requirements of the State Pharmacopoeia. The advantage of the new cleaning method is simplicity, speed (40 min) and the possibility of automation in modern synthesis modules. The use of disposable SPE cartridges at the purification stage meets modern GMP requirements.

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POLYMER COATINGS FOR PROTECTION OF HEAT-EXCHANGE TUBES OF VAPOR CONDENSER AGAINST CORROSION AND SALTATION

Posted in 2018, CHEMISTRY, Issue №5(71) May 2018 | 0 comments

Fundamental physical and chemical processes on metallic heat-exchange surfaces cause the interconnection of the processes of scale depositing and corrosion. The usage of polymer coatings on the inner surface of the heat-exchange tubes promotes the decreasing of scale depositing and prevents corrosion. Laboratory studies and complex examination of the corrosion state and scale depositing showed that ROCOR polymer coatings proved to be more effective anticorrosive protection having antiscaling action with industrial experience of 12 years.

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DETERMINATION OF PARAMETERS OF UNIT CELLS AND ELECTROPHYSICAL PROPERTIES OF COMPLEX OXIDES IN CaSnSiO5 – YFeTiO5 SYSTEM

Posted in 2018, CHEMISTRY, Issue №5(71) May 2018 | 0 comments

Solid solutions with the general formula Ca1-xSn1-xTixSi1-xYxFexO5 were synthesized in the low-temperature plasma of hydrogen-oxygen flame (LTP). The chemical composition of the samples in the “x” interval varied from 0 to 1.0 in the experiments. Depending on the chemical composition, the parameters of the crystallographic lattice were determined. It was found that at a temperature of 1170 K the CaSnSiO5–YFeTiO5 system consists of two homogeneous phases with wide homogeneity regions. The pycnometric densities and electrophysical characteristics of the samples were measured: the electrical conductivity (σ), the band gap (ΔE), the permittivity (ε), the molar polarization (P), and the molecular polarizability (α). It is established that all the compositions studied are dielectrics with a semiconducting character of electrical conductivity.

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EPOXY MATERIALS DILUTED BY WATER FOR ANTI-CORROSION PROTECTION OF CONSTRUCTION STRUCTURES IN ADVERSE CLIMATIC CONDITIONS

Posted in 2018, CHEMISTRY, Issue №5(71) May 2018 | 0 comments

A new generation of environmentally friendly protective waterborne epoxy coatings has a combination of significant advantages over traditional water-dispersible compositions. Long-term use in industrial conditions and extended climatic tests in the temperate cold, marine and tropical climates have shown that waterborne epoxy couches and enamels are resistant to freezing at – 40°C, do not contain volatile components with a sharp chemical odor, temperatures, ultraviolet and retain decorative properties in an acceptable color range.

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DIFFUSION OF PHOSPHONIC INHIBITORS FOR SCALE FORMATION IN EPOXY MATRIXES

Posted in 2018, CHEMISTRY, Issue №4(70) April 2018 | 0 comments

The transfer of solutions of phosphorus-containing scale forming inhibitors in epoxy coatings was studied. It is shown that the diffusion distribution profiles of phosphonic acids have a discontinuous front view characteristic of a mineral and organic acids. The penetration rates of λ phosphonic acids are comparable to that characteristic of inorganic acids, in particular, phosphoric acids. The acid/water ratio in the internal solution in the polymer is higher than in the external solution of the diffusant at the diffusion of phosphonic acids into epoxy matrices having ion-exchange properties.

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MATERIALS OF FUTURE

Posted in 2018, CHEMISTRY, Issue №2(68) February 2018 | 0 comments

The most perspective and actively used groups of “smart” materials and the origin of the term itself are considered in the paper. The basic properties, the methods of development and application of “smart” materials are indicated, their multi-functionality is established. The theoretical basics and the experiment on development of supramolecular materials by the scientists of Munich Technical University are given. The results of this study are analyzed, and the conclusion is as follows: the use of supramolecular hydrogels in relation to the living organism is limited.

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ANTIOXIDANT ACTIVITY OF INHIBITORS IN OXIDIZATION OF PINANE HYDROPEROXIDE

Posted in 2018, CHEMISTRY, Issue №1(67) January 2018 | 0 comments

The need to improve the quality of motor fuels through the introduction of additives is shown in the paper. The urgency of developing new antioxidants and determining their effectiveness has been revealed. The mechanism of hydrocarbon oxidation is described. Experimental studies of the kinetics of its decomposition in the presence of inhibitors of peroxide reactions were carried out on the example of a model substance (pinane hydroperoxide). It was established that all studied inhibitors significantly, with varying degrees of activity, increase the stability of the model substance.

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COMPARISON OF IMMOBILIZATION METHODS OF PROTEOLITHIC BACILLUS SUBTILIS COMPLEX ON CHITOSAN

Posted in 2018, CHEMISTRY, Issue №1(67) January 2018 | 0 comments

The methods of activation of the matrix – high molecular weight chitosan for subsequent immobilization of enzymes of a proteolytic complex from Bacillus subtilis are investigated. Benzoquinone, glutaraldehyde and epichlorohydrin are used for the activation reaction. It is shown that the use of glutaraldehyde in the technology for the activation of the technology allows obtaining preparations of immobilized enzymes with a higher specific activity and lower losses. The technological parameters of synthesis of preparations of immobilized proteases were chosen.

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ТРАНСФОРМАЦИЯ ДИМЕТИЛФЕНОЛОВ В ПРИСУТСТВИИ ВОДНЫХ РАСТВОРОВ Р-Мо-V ГЕТЕРОПОЛИКИСЛОТ: 2. МЕХАНИЗМ РЕАКЦИИ

Posted in 2017, CHEMISTRY, Issue №12(66) December 2017 | 0 comments

Окисление диметилфенолов в соответствующие пара-хиноны важно с точки зрения их дальнейшего применения в различных важных областях науки. В статье описаны основные этапы трансформации 2,3- и 2,6-диметилфенолов в соответствующие пара-бензохиноны в двухфазных системах в присутствии водных растворов Р-Мо-V гетерополикислот, установленные в ходе детального анализа экспериментальных данных. Найденные закономерности могут быть использованы для расширения круга потенциальных субстратов и упрощения оптимизации реакционных условий.

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OXIDATIVE TRANSFORMATION OF NATURAL COMPOUNDS UNDER CONDITIONS OF INTER-PHASE CATALYSIS

Posted in 2017, CHEMISTRY, Issue №12(66) December 2017 | 0 comments

The problem of complex processing of renewable raw materials using environmentally safe and low-waste technologies is now becoming increasingly important. Natural compounds are convenient objects for oxidative transformation with the production of a number of practically important substances. The use of bi-functional catalysts based on peroxypolyxometallates in combination with quaternary ammonium cations is a promising direction for carrying out the reaction of hydrogen peroxide oxidation of desaturated compounds of natural origin such as desaturated fatty acids, terpenes and benzopyrones.

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CHEMICAL MODIFICATION OF SUNFLOWER OIL

Posted in 2017, CHEMISTRY, Issue №12(66) December 2017 | 0 comments

The paper considers the possibility of chemical modification of sunflower oil in various systems. Oil is obtained from bleaching earth after refining. The composition of vegetable oils is studied by means of IR spectroscopy and chromatography. The most efficient conditions for the chemical modification of sunflower oil are identified. While studying the oxidation process of vegetable oil, the kinetics of change in functional groups which is prone to polymerization is shown. The oxidation and polymerization processes are confirmed by IR spectroscopy.

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ABOUT DEVELOPMENT PRIORITIES OF TECHNOLOGY AND PROCESSING OF ELASTOMERS

Posted in 2017, CHEMISTRY, Issue №12(66) December 2017 | 0 comments

The paper presents a brief history of technology and processing of natural rubber from origin to the contribution of France, Russia and the USA in its development. The features of the development of technology and processing of elastomers during the world wars of the 20th century are analyzed as well. The relationship between the weakening of postwar US sanctions for the period of introduction of furnace black carbon in the USSR with prohibitions on the publication of research results on the properties of its highly structured porous grades for antistatic rubbers is established. The features of the postwar development of technology and the processing of elastomers in the US and modern Russia are analyzed.

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FRACTIONATION, CHARACTERISTICS AND USE OF MEMBRANE FRACTION OF GLUCONOBACTER OXYDANS BACTERIA

Posted in 2017, CHEMISTRY, Issue №12(66) December 2017 | 0 comments

The paper presents the method for obtaining membrane fractions of Gluconobacter oxydans bacteria for the use in biosensors and biofuel elements. The activity of the enzyme preparation with the use of the quinoneimine dye of 2,6-dichlorophenolindophenol (2,6-DXFIH) is determined by a spectrophotometric method. It is established that the increase in the centrifugal acceleration up to 101000g enables a more complete deposistion of membrane fractions of the Gluconobacter oxydans bacteria, and the obtained enzyme preparation has the greatest activity in relation to the oxygen consumption, which makes it a more effective biocatalyst.

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