Synthesis ofN-substituted 2-(5,6,7,8-tetrafluoro-4-oxo-1,4-dihydroquinolin-3-yl)glyoxylic acids

Methods for the synthesis of the earlier unknownN-substituted 2-(5,6,7,8-tetrafluoro-4-oxo-1,4-dihydroquinolin-3-yl)glycoxylic acids their esters from copper chelate of ethyl pentafluorobenzoylpyruvate were developed. The structure of intermediate ethyl 4-(R-amino)-2-oxo-3-pentafluorobenzoylbut-3-enoates is discussed. Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1234–1239, July, 2000.     

Reactions of 2-ethoxycarbonyl(carboxy)-5,6,7,8-tetrafluorochromones with N-nucleophiles

The direction of reactions of 2-ethoxycarbonyl-5,6,7,8-tetrafluoro- and 2-carboxy-5,6,7,8-tetrafluorochromones with ammonia, methylamine, hexylamine, and aniline depends on the inductive effect of the substituent at position C-2 of the chromone and on the basicity of the amine. Nucleophilic aromatic substitution of a fluorine atom takes place in the interaction of 2-ethoxycarbonyl-5,6,7,8-tetrafluorochromone with secondary amines (morpholine,N-methylpiperazine) and ethylenediamine.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 904–907, May, 1994.     

Transesterification of copper(II) β-ketoesterates and acylpyruvates with borneol

Transesterification of copper(II) acetoacetates, copper(II) trifluoroacetoacetate, and copper(II) acylpyruvates with borneol gives the copper(II) chelates of the corresponding bornyl esters in 92–95 % yields. Bornyl acetyl- and perfluoroacylpyruvates were synthesized for the first time by decomposing the respective chelates with hydrogen chloride. Bornyl acylpyruvates react with hydrazine hydrate to give 5-alkyl-3-bornyloxycarbonylpyrazoles.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 902–904, May, 1993.     

Liquid-phase oxidation of anthracene by hydrogen peroxide in the presence of heterogenized vanadyl acetylacetonate

The synthesis of heterogenized vanadyl acetylacetonate was accomplished by alkylation of a chloromethylated styrene—divinylbenzene copolymer via activation by Co(II) complexes. The effect of heterogenization on the structure of the complexes and their catalytic properties in the peroxide oxidation of anthracene was investigated by kinetic studies and EPR spectroscopy. Increased stability during oxidation of the catalytic centers of the polymer sample as compared with homogeneous vanadyl acetylacetonate was demonstrated.Department of Fine Organic Synthesis, Institute of Chemistry, Bashkir Science Center, Ural Branch, Russian Academy of Sciences, Ekaterinburg 620219. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 4, pp. 800–804, April, 1992.     

New fluorine-containing polyazaheterocycles

Interaction of perfluoropentene-2 with ethylenediamine, diethylenetriamine, and triethylenetetramine forms previously unknown fluorine-containing azaheterocycles in yields of 25–74%. The structure of the compounds obtained has been confirmed by¹H and¹⁹F NMR methods and mass spectrometry.Department of Fine Organic Synthesis, Institute of Organic Chemistry, Urals Branch, Russian Academy of Sciences, 620219 Ekaterinburg. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 9, pp. 2170–2174, September, 1992.     

Halide polyhydrates of some rare-earth elements: Synthesis and structures

Scandium, yttrium, lanthanum, cerium, and terbium bromides and iodides of the formulas [(H₂O)₅Sc(μ-OH)₂Sc(H₂O)₅]Br₄ · 2H₂O (I), [(H₂O)₅Sc(μ-OH)₂Sc(H₂O)₅]I₄ (II), [Y(H₂O)₈]Br₃ · 2H₂O (III), [(H₂O)₇La(μ-Br)₂La(H₂O)₇]Br₄ (IV), [Ce(H₂O)₉]I₃ (V), and [Tb(H₂O)₉]I₃ (VI) were obtained and examined using X-ray diffraction and IR and Raman spectroscopy. It was found that the compositions and structures of complexes II and III differ from the literature data. Crystallographic parameters were obtained for isostructural complexes V and VI. It was demonstrated that the conditions of the synthesis and the possibility of protolysis are decisive for the formation of polynuclear oxo and hydroxo complexes of rare-earth metal halides.     

Synthesis,X-ray crystal structure,and properties of antipyrinium perchlorates,hexakis(antipyrine)thulium- and hexakis(antipyrine)ytterbium perchlorates. Quantum-chemical studies of ligands protonation

Protonation of the bioactive ligand-antipyrine (AP, 2,3-dimethyl-1-phenyl-3-pyrazolin-5-one) has been considered, the crystal packing specific features for the protonated antipyrine perchlorate compounds ([APH]ClO₄ · H₂O (1, 2) and [AP₂H]ClO₄ (3, 4)), as well as the crystal structure particularities for [Tm(AP)₆](ClO₄)₃ (5) and [Yb(AP)₆](ClO₄)₃ (6) have been elucidated. The protonation ability—complex formation ability relationship has been revealed for a number of organic ligands. Quantum-chemical calculations (DFT) and comparison with the experimental data allowed aligning some organic ligands in a row according to their ability to be protonated and to be incorporated into the inner coordination sphere of the complex.     

Topologies on the n-Element Set Consistent with Topologies Close to Discrete on an (n−1)-Element Set

Ukrainian Mathematical Journal - Topologies on a finite set are described by a nondecreasing sequence of nonnegative integers (vector of topologies). We study T0-topologies on the n-element set...     

Synthesis and characterization of [Co(NH3)5NO2][M(NO2)4] (M = Pt, Pd) compounds and their thermolysis products

Compounds [Co(NH₃)₅NO₂][Pd(NO₂)₄] (I) and [Co(NH₃)₅NO₂][Pt(NO₂)₄] · 1.5H₂O (II) have been crystallized from solution. Their crystal structures have been solved, and thermolysis under various conditions studied. The thermolysis products are Co_0.5M_0.5 ordered solid solutions.     

Probing of pair interaction of magnetic microparticles with optical tweezers

Magnetic interaction of paramagnetic Brownian submicron-sized particles is studied by optical tweezers technique. Correlation analysis allows one to extract magnetic interaction of two particles 0.4 μm in size, which are optically trapped at the distance of 3 μm one from each other and placed in a static magnetic field of 30 Oe, from the background of their Brownian motion. The magnetic interaction force is estimated to be of approximately 100 fN. Two configurations of the mutual orientation of the magnetic field vector and the line connecting two centers of optical traps are used in the experiment. For field vector orientation parallel/perpendicular to this line, the magnetic interaction is detected by the cross-correlation function increase/decrease in comparison with the absence of magnetic field on the time scales of 1 ms.