Isomeric bis(pyrazolyl)sulfones based on bis(1,1-dihydropolyfluoroalkyl)sulfones. A new type of ligands for metal-polymer complexes with silver cation

The work is devoted to the methods of synthesis of bis(polyfluoroalkenyl)sulfones and bis(polyfluoromethoxyalkenyl)sulfones as well as to the study of their reactions with diazomethane, resulting in the formation of N-methylated bis(pyrazolyl)sulfones isomers. Methods for the preparation of bis(polyfluoromethoxyalkenyl)sulfones not described previously in the literature have been developed by the addition of triethylamine and trimethylchlorosilane to a solution of the respective bis(polyfluoroalkyl)sulfones and methanol in diethyl ether in an argon atmosphere. A new method for the preparation of a previously unknown bis(3,3-difluoro-2,2-dimethoxypropyl)sulfone was suggested. The reaction occurs at room temperature in methanol in the presence of lithium hydroxide monohydrate. It was found that different regioisomeric bis(polyfluoroalkylpyrazolyl)sulfones are formed when using different methoxy derivatives of bis(polyfluoroalkenyl)sulfones in reaction with diazomethane, depending on the length of the polyfluoroalkyl moiety. These experimental data suggest that the attack of the double bond of methoxy-derived bis(polyfluoroalkenyl)sulfones by a molecule of diazomethane is influenced not only by the presence of an alkoxyl group, but also by the length of the polyfluoroalkyl substituent. The obtained bis(pyrazolyl)sulfones were investigated for the possibility of their use as ligands in the chemistry of metal complexes. It was shown that 5,5'-sulfonylbis[4-(difluoromethyl)-1-methyl-1H-pyrazole] forms a polymeric metal complex with silver nitrate. The results of X-ray structural analysis of the prepared coordination compound are presented. According to these results, the silver atom coordinates with two nitrogen atoms of pyrazole cycles of different molecules in the crystal of the obtained metal-complex compound, forming a supramolecular structure. In our opinion, an important role in this arrangement is played by the nitrate group that is coordinated with two silver atoms. As a result, we observed a supramolecular structure in the crystal that had a spiral structure with some free space in the middle. The paper also presents the results of spectral and X-ray diffraction analysis of a new regioisomeric compound of bis(3-hexafluoropropyl-1-methylpyrazolyl)sulfone.

DEVELOPMENT OF THE METHOD AND OPTIMIZATION OF THE COMPOSITION AND MODES OF OBTAINING THE BIODEGRADABLE GREASE WITH THE LITHIUM-CALCIUM THICKENER

It is noted that the development of biodegradable lubricants is an integral part of the development of a modern “green” economy. The distinctive features of the proposed method are described for producing a biodegradable grease on a mixed lithium-calcium thickener, providing for the introduction of alkaline initial components of the dispersed phase (lithium hydroxide monohydrate and calcium hydroxide) into the reaction mass not in the form of their aqueous solutions, but in a powdery state, and the exception of prolonged exposure to water and high temperature on a component of a dispersion medium of plant origin (rapeseed oil) in the process of lubricant synthesis. Along with this, it was proposed to use a highly refined oil of group III according to the API (American Petroleum Institute) standard as a mineral component of the dispersion medium. This provides, in aggregate, the higher stability of the rheological and tribological characteristics of the grease (for at least 12 months) at a given level of biodegradability. The experimental-statistical mathematical model of the process of obtaining the biodegradable lithium-calcium grease is developed, which makes it possible to determine the parameters of the component composition (the content of the mixed lithium-calcium thickener in the grease and the content of lithium stearate in the mixed thickener) and the synthesis modes (the heat treatment temperature of the reaction mass) to achieve the given level of the main characteristics of the finished grease (penetration, dropping point) while ensuring its biodegradability of at least 80 %.

Recovery of lithium hydroxide monohydrate from a nickel-rich cathode material by a novel heat-treatment process at a significantly low temperature

Lithium hydroxide monohydrate (LiOH·H2O) was easily recovered from LiNi[Formula: see text]Co[Formula: see text]Al[Formula: see text]O2, a Ni-rich cathode material, by a novel heat-treatment process, under a hydrogen (H2) atmosphere at a significantly low temperature of 500∘C. This process is eco-friendly and can facilitate the recovery of valuable metals without requiring acids. Because of the low O2 partial pressure (1.0 × 10[Formula: see text] atm) of the H2 atmosphere, the characteristic (003) X-ray diffraction peak of the layered cathode material disappeared at 500∘C, and LiOH·H2O was easily recovered. To the best of our knowledge, this is the lowest temperature ever employed for LiOH·H2O recovery from Ni-rich cathode materials using the dry method.

Efficient Synthesis and Evaluation of Ultrasonic Assisted 1, 3-oxazin-2- amines as Encouraging Agents

Aims: 1,3- Oxazine-2-amines synthesized by sonochemical method using green catalyst lithium hydroxide monohydrate to enhance effect in reaction time when compared to traditional methods under acoustic energy. Background: Hostile to microbials accept a noteworthy activity in the treatment of infections to the individuals and at the same time, strange, medication of higher enemy of contamination changes protections in the quality level and may turn into the purpose for the anti-microbial opposition. Objectives: In this assignment, an undertaking has been made to join a couple of auxiliaries of 1, 3- oxazine-2-amines by ultrasonic irradiation with shorter reaction time also their in vitro screening was coordinated against Mycobacterium tuberculosis, Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis, Staphylococcus aureus, Aspergillus niger and Candida albicans. Methods: Five compounds were produced by under ultrasonic illumination within the use of lithium hydroxide monohydrate (LiOH.H2O) as a catalyst, which gave the items in great yields after short response times under mellow conditions The proposed concoction structures were affirmed by various spectroscopic systems like FTIR, 1H NMR and Mass spectroscopy. TLC was utilized to realize that the reactants were depleted and the development of the item happened. Sharp melting point of the compounds concludes the purity. All the molecules assessed for in vitro antibacterial and antifungal exercises. Antibacterial and antifungal exercises were tried utilizing the agar dispersion technique. Results: From the screening thinks about it was seen that a large portion of the compounds have indicated moderate antibacterial and antifungal inhibition at 500 μg/mL and 100 μg/mL fixations individually. The MIC of the molecules like C (Chloro), N (Nitro) demonstrated promising activity at the conenctration of 1.6 μg/ml and F (Fluoro) – 3.12 μg/ml when appeared differently in relation to measures like Pyrazinamide-3.125μg/ml, Ciprofloxacin 3.125μg/ml, Streptomycin-6.25μg/ml against Mycobacterium tuberculosis. Conclusion: The results are extremely promising which on further assessments may provoke medicine particles against different microorganisms. Especially, C, N can be considered as a far reaching range master due to its solid development against different microorganisms like Mycobacterium tuberculosis, Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia and Candida albicans.

Green approach to Chemo-Selective N-Boc Protection of Amines using Catalytic amount of Lithium Hydroxide Monohydrate under Solvent Free Condition

<p>The protecting group plays important role in synthesis of multifunctional targets. A simple rapid efficient and green method for chemo-selective N-Boc protection of amines using Lithium hydroxide as a green catalyst. In the present work amine protection in presence of ditert-butyl carbonate under solvent free condition is carried out. An efficient green protocol for chemoselctive N-Boc protection of aryl, aliphatic, aromatic, acyclic and hetero cyclic amines (1 m mol %)( 10, 20, 30) were carried out with ditert-butyl carbonate (Boc)2 O using Lithium hydroxide monohydrate (10 mol %) at room temperature under solvent free condition to give white solid monitored on TLC. No side reactions are observed .The present protocol were simple, rapid, efficient, shorter reaction times, high yielding, highly selective, economical and eco-friendly</p>

Analysis of a Process for Producing Battery Grade Lithium Hydroxide by Membrane Electrodialysis

A membrane electrodialysis process was tested for obtaining battery grade lithium hydroxide from lithium brines. Currently, in the conventional procedure, a brine with Li+ 4–6 wt% is fed to a process to form lithium carbonate and further used to produce lithium hydroxide. The disadvantages of this process are its high cost due to several stage requirement and the usage of lime, causing waste generation. The main objective of this work is to demonstrate the feasibility of obtaining battery grade lithium hydroxide monohydrate, avoiding production of lithium carbonate. A laboratory cell was constructed to study electrochemical kinetics and determine energetic parameters. The effects of current density, electrode material, electrolyte concentration, temperature and cationic membrane (Nafion 115 and Nafion 117) on cell performance were determined. Tests showed that a current density of 1200 A/m2 and temperatures between 75–85 °C allow reduced specific electricity consumption (SEC) (7.25 kWh/kg LiOH). A high purity product is obtained at temperatures below 75 °C, with a Nafion 117 membrane and low electrolyte concentration. Resulting key electrochemical data would enable a pilot-scale process implementation to obtain lithium compounds.