This study presents a novel synthetic strategy for the preparation of tetralin derivatives via Lewis acid-catalyzed intramolecular cyclization of 1-chloro-5-methyl-5-aryl-2,3-epoxyhexanes.Tetralin-based compounds are of significant interest due to their broad applications in medicinal chemistry, agrochemicals, and advanced materials.However, their synthesis through traditional pathways often involves harsh reaction conditions, poor selectivity, and low yields.In this work, an alternative approach employing Lewis acids as catalysts -specifically anhydrous aluminum chloride (AlCl3) -is developed and optimized for the selective transformation of alkylaromatic epoxides into tetralin-type structures.The reactions were performed under inert atmosphere using n-hexane or dichloroethane as solvents.The intramolecular cyclization reactions produced key target compounds, including 1,1-dimethyl-4-chloroethyl-1,2,3,4-tetrahydronaphthalen-3-ol (compound III) and 1,1,5,8-tetramethyl-4-chloromethyl-1,2,3,4tetrahydronaphthalen-3-ol (compound IV), in good yields.The formation of these derivatives was confirmed through IR and NMR spectroscopy as well as elemental analysis.Furthermore, the study systematically investigated the influence of temperature, solvent polarity, catalyst type, and molar ratios on reaction efficiency.The use of AlCl3 resulted in the highest yields and selectivity at low temperatures.This approach provides a clean, efficient, and reproducible route for constructing tetralin frameworks and highlights the potential of Lewis acid-mediated cyclization in modern synthetic organic chemistry

Destruction of petrochemical equipment caused by acid corrosion is one of the main environmental problems faced by the oil refining industry.Corrosion of metals, including corrosive destruction of metal structures: pipelines, tanks, reactors, etc., can cause a decrease in their performance, as well as emergency situations with spills of aggressive and biologically hazardous liquids, which will lead to a local increase in environmental pollution.A promising method of protecting steel structures from various types of corrosion is the use of inhibitors.Recently, attention has been focused on the development of environmentally friendly methods for slowing down corrosion, since inorganic and organic inhibitors have a number of side effects.Recent studies have focused on green inhibitors, which can be used to slow down the corrosion process of industrial equipment operating in acidic environments.These reagents are environmentally friendly and economically affordable.One of the distinctive features of green plant inhibitors is their good biodegradability, which opens up good prospects for their use in technology.As such green corrosion inhibitors, we proposed derivatives of some vegetable oils (sunflower, corn, palm, cottonseed).Continuing research in this direction, we are studying the possibility of using technical oils, in particular, safflower and linseed.Thus, sulfo derivatives of the specified oils were synthesized and studied as mild steel corrosion inhibitors in various aggressive environments.The results obtained allow us to conclude that it is possible to use compounds obtained using safflower and linseed oils as green corrosion inhibitors Keywords: corrosion, corrosion inhibitors, vegetable oils, safflower oil, linseed oilThe corrosion process of metal equipment both during storage and transportation greatly affects the development of the oil and gas industry.At the same time, accidents and other unforeseen circumstances are almost impossible to avoid and, as a result, the biosphere is polluted.The concept of "green chemistry" in the development of environmentally friendly metal corrosion inhibitors has acquired particular importance at the present stage.The specific implementation of this concept requires the development of environmentally friendly and cost-

The most pressing issue of our time -the solution to the environmental problem -is our main goal to obtain less harmful ecologically clean diesel fuel.For this purpose, diesel fuel subjected to the hydrotreating process meets the requirements of EURO-3 in terms of total sulfur content (250 -300 ppm).However, since surfactants -sulfur, oxygen, nitrogen compounds are removed, we encounter another problem -a decrease in the lubricating ability of the fuel, which causes the metal parts of the engine running on this fuel to wear out due to friction.To solve this problem, petroleum acids obtained at the Heydar Aliyev Oil Refinery and esters of cyclic neopolyols synthesized in the "Synthetic Oils" laboratory at our institute are recommended to improve both the lubricating and thermooxidative stability of ecologically clean diesel fuel.It is also known from the literature that the substance taken as an antioxidant reduces the effect of the anti-wear additive used in the fuel.Therefore, it is necessary to select the number of additives used together so that their overall effect on environmentally friendly diesel fuel gives a positive result.In general, when adding 0.0045% tetramethylolcyclopentanol pentaester and 0.015% petroleum acid fraction (sample V), the amount of sediment in the determination of thermooxidative stability decreased from 4.35 to 1.23 mg, and the diameter of the corrosion spot decreased from 1000 to 410 m; when adding 0.0045% tetramethylolcyclohexanol pentaester and 0.015% petroleum acid fraction (sample VI), the amount of sediment decreased to 1.23 mg, and the diameter of the corrosion spot decreased to 380 m

The aldol condensation reaction is one of the most powerful and versatile synthetic methods in organic chemistry and has been extensively studied to optimize conditions, minimize side reactions, and understand stereochemical outcomes.Among various substrates, 1,5-diketones have emerged as valuable participants due to their accessibility and reactivity, especially for synthesizing heterocyclic and carbocyclic compounds.Notably, the 1,5-diketone motif plays an important role in constructing the A ring of steroids.Involvement of 1,5-diketones in aldol condensation has enabled the synthesis of new carbo-and heterocycles and clarified the formation pathways of pyrylium salts.However, some types of 1,5diketones, particularly "semicyclic" ones -where one carbonyl group is in a ring and the other is exocyclic -have not been sufficiently studied.These asymmetrical cycloaliphatic 1,5-diketones present different reactive centers, raising questions of regiospecificity and regioselectivity, which create opportunities for constructing new molecular architectures.Addressing these challenges opens perspectives for expanding the chemistry of this compound class.1,5-Diketones are important intermediates in organic synthesis thanks to their availability and versatile reactivity, serving as convenient starting materials for carbocyclic compounds.Several methods exist for their preparation, with one main route being the Michael reaction, often catalyzed by bases or lithium perchlorate, and sometimes assisted by ultrasound.A known variant, the Robinson annulation, also effectively yields these diketones

Asymmetric synthesis is a prerequisite for the emergence of life, which reproduces itself in chiral form for billions of years.Being inherently chiral, a living organism treats different enantiomers as different chemical substances.Numerous bioactive molecules and drugs exhibit chirality, with their physiological effects depending on the directionality of the stereoisomer.Classical synthetic methods are mainly based on resolution with stoichiometric chiral reagents and diastereoselective synthesis with chiral auxiliaries.Chiral ligands can be divided into different groups depending on their chemical framework.Chiral auxiliaries have been widely used in the synthesis of enantiomerically pure compounds.The growing interest of the scientific community in asymmetric synthesis of biologically active compounds is due to the discovery of natural substances whose pronounced pharmacological activity is concentrated in one of the enantiomers.Asymmetric catalysis is at the forefront of modern chemistry, serving as a cornerstone for the efficient creation of enantiopure chiral molecules characterized by high selectivity.Chiral catalysts have found the widest application in asymmetric synthesis reactions in recent years.Among such catalysts, chiral metal complexes are the most widely used, which is due to the simplicity of their preparation, low cost and high efficiency.The presented work shows the analysis of the results of scientific research in the field of application of chiral copper complexes in asymmetric synthesis, including the results of the authors' own research

For many years, academician Y.H. Mammadaliyev Institute of Petrochemical Processes has conducted both fundamental and applied research in the development of multifunctional reagents, including corrosion and scale inhibitors, inhibitor-bactericides, inhibitors against asphalt-resin-paraffin deposits, conservative liquids and lubricants, antistatic additives, and modifiers for road bitumen.As a result of these studies, reagents such as "VFIKS-82", "Azeri", "Kaspi", "Kaspi-X", "Kaspi-X(M)", "Parkorin-1", "Parkorin-22A", "Ap-L34-1", and "BEPIKOR" etc., have been developed, their production technologies elaborated, pilot and industrial productions organized and implementations carried out.Many of these reagents are multifunctional.The production technology for "VFIKS-82" reagent was sold under license to the Russian Federation, and an industrial facility with an annual capacity of 20,000 tons was established at the Meleuz Mineral Fertilizer Plant.The facility also produced the winter version of the mentioned inhibitor, "Azeri".These inhibitors were applied in the Russian Federation and Kazakhstan.The Pilot-industrial production of VFIKS-82 was also established in Azerbaijan, and applied in industry in Azerbaijan, Ukraine, and Turkmenistan.The AP-L31-1 antistatic additive was applied at the Perim aviation engine plant.Pilot-industrial production of the V-2 road bitumen modifier was organized and applied in road construction in Azerbaijan.The effectiveness of nitrogen-containing organic compounds as various functional reagents was studied depending on their structure, the nature and number of functional groups, and component composition

Currently, the State Oil Company operates over 130 units of gas engine piston compressors of the 10GKNAM 2/5-55, 10GKNAM 3/5-100, 10GKNAM 2/50-150 and MKS-12 types.It is known from the theory of reliability that premature technical shutdown of the gas engine piston compressors is accompanied by extraneous noise in parts or units, exceeding the temperature standards in the units, where technical malfunctions and a decrease in the productivity of compressor machines occur, which are very significant problems.Therefore, it is of great importance to identify these problems using method without stopping the gas engine piston compressors and conduct preliminary diagnostics.For this purpose, very important results can be obtained by deep analysis of operation, using statistical technological parameters, physical, technical and technological methods.The application of this method in practice is by listening to the outer surface at an extremely close distance, where noise is heard and it is possible to determine with greater accuracy in which unit there are technical defects.During the operation of compressor machines, it is difficult to determine the technical malfunction of any part or unit by reliability indicators.For this reason, to ensure the efficient operation of compressor machines, in addition to technical, technological and statistical parameters, listening to extraneous sounds and checking the temperature with a simple stethoscope and physical, technical and technological diagnostics are of great importance.As a result, it becomes possible to accurately and quickly identify technical faults of compressor machines and eliminate them by repair in a short time