Detrifluoroacetylation of Ethyl 2-(Ethoxymethylene)- 4,4,4-Trifluoro-3-Oxobutanoate

This work was financially supported by the Council for grants of the President of Russian Federation (grant no. MK-1453.2019.3)

Polynuclear Metallic Architectures Based on Fluorinated Functionalized Diketonates

K.Y.S. is thankful to the Council for grants of the President of Russian Federation (grant no. 1453.2019.3)

Polyfluoroalkylated 2,3-Butanedione-Based Lithium Diketonates as Promising Building Blocks in Coordination and Heterocyclic Chemistry

Financial support from the Russian Foundation for Basic Research (grant № 18-33-20124) is gratefully acknowledged

Expanding 1,2,4-triketone Toolbox for use as Aluorinated Building Blocks in the Synthesis of Pyrazoles, Pyridazinones and β-diketohydrazones

Fluorinated lithium β-diketonates bearing a methyl acetal group behave in the condensation reactions with hydrazines as trielectrophilic building blocks for the preparation of pyrazoles, pyridazinones and β-diketohydrazones. For the first time, solvent-induced regioisomeric and heterocyclic ring size-controlled formation was observed for 1,2,4-triketone analogues. Fluoroalkylated acetyl NH-pyrazoles or substituted 5-RF-pyrazoles were obtained from the acid-catalyzed cyclocondensation of lithium β-diketonates with (aryl)hydrazines in ethanol. In methanol solvent acetyl-containing 3-CF3-pyrazoles were isolated because of inverse nucleophilic attack of arylhydrazines. The use of aprotic acetonitrile in the condensation resulted in regioselective trifluorinated pyridazinones and fluorinated β-diketohydrazones formation via initial acetal fragment interaction with N,N-dinucleophile. © 2021 Elsevier B.V.This work carried out in the framework of the basic theme of the Russian Academy of Sciences (state registration № AAAA-A19-119011790132-7). Single-crystal X-ray diffraction analysis for 3g, 3f and 10a was performed using the equipment of the JRC PMR IGIC RAS. Single-crystal X-ray diffraction analysis for 5d, 7a, 9a and physicochemical studies were carried out using the equipments of the Center for Joint Use "Spectroscopy and Analysis of Organic Compounds" at the Postovsky Institute of Organic Synthesis UB RAS

A Rare Example of Discrete Lanthanide–Lithium Tetrakis-β-Diketonates: Synthesis, Structures, and Luminescence Properties

Abstract: The reactions of functionalized lithium CF3-β-diketonate (LiL) with europium(III) and terbium(III) chlorides in acetonitrile afford heterobimetallic complexes with the general formula [LiL-nL4(H2O)](CH3CN) (Ln = Eu (IIIa) and Tb (IIIb)). It is found that Ln–Li tetrakis-β-diketonates can also be prepared by the crystallization from acetonitrile of the previously synthesized complexes [(LnL3)(LiL)(MeOH)] (I) and [(LnL3)(LiL)(H2O)] (II). For the first time, the single crystals of the compounds in a series of Ln–Li tetrakis-β-diketonates are characterized by X-ray diffraction analysis (CIF files CCDC nos. 1973632 (IIIa) and 1973633 (IIIb)). The photoluminescence properties of the synthesized heterometallic complexes in the solid state are studied. © 2020, Pleiades Publishing, Ltd.This work was supported by the Russian Foundation for Basic Research (project no. 18-33-20124), Council for Grants of President of the Russian Federation (grant no. MK-1453.2019.3), and basic themes of the Russian Academy of Sciences (state registration nos. AAAA-A19-119011790132-7 and AAAA-A19-119012490006-1)

Динамика газовыделений больных тяжелой бронхиальной астмой на фоне базисной противовоспалительной терапии

Because of the shortcomings of existing methods of assessment of asthma severity, the method of laser opto-acoustic spectroscopy was considered using for this purpose. Findings results show the availability of this method for diagnostics of clinical course severe asthma.В связи с недостатками существующих методов оценки состояния тяжести бронхиальной астмы рассмотрены возможности использования для этой цели метода лазерной оптико-акустической спектроскопии. Полученные результаты показывают перспективность данного метода для диагностики течения тяжелой бронхиальной астмы

The stability of piezoceramic materials properties at external influences

The impact of exciting electric fields (static and resonance frequency alternating), mechanical uniaxial loading and temperature on the stability of working parameters of piezoelectric ceramic elements had been investigated. It is shown that after the removal of excitation the long relaxation of properties under the law close to logarithmic is observed