AbstractThe title compounds are tested as ligands in Sonogashira coupling reactions.

The influence of polyfunctional hydroxyl-containing oligomer on the rheological, physicomechanical, and adhesive properties of polyurethane composite based on multicomponent oligomer blend and polyisocyanate is investigated. The kinetics of curing is investigated by the viscometric method, and the composition lifetime is determined. It is shown that the polyurethanes under investigation can be used as fast-curing adhesive composites of cold curing operating in a temperature interval of up to +90°C.

Methyl 7,7-dimethyl-5-oxo-5,6,7,8-tetrahydroquinoline-4-carboxylates were obtained as a result of 3-amino-5,5-dimethylcyclohex-2-enone reaction with the methyl esters of acyl(aroyl)pyruvic acids. The structure of methyl 7,7-dimethyl-5-oxo-2-phenyl-5,6,7,8-tetrahydroquinoline-4-carboxylate was established by X-ray structural analysis.

The reaction of 2-substituted 7,7-dimethyl-5-oxo-5,6,7,8-tetrahydroquinoline-4-carboxylic acids with hydroxylamine results in the formation of 5-substituted 8,8-dimethyl-8,9-dihydro-3 H ,7 H -[1,2]ox-azino[5,4,3- de ]quinolin-3-ones. The structure of the 5-phenyl derivative has been established by X-ray structural analysis. A possible mechanism of the reaction has been proposed on the basis of nonempirical quantum-chemical calculations.

The reaction of 2-substituted 7,7-dimethyl-5-oxo-5,6,7,8-tetrahydroquinoline-4-carboxylic acids with hydrazine was studied. This reaction gave 5-substituted 8,8-dimethyl-3,7,8,9-tetrahydro-2H-pyrido-[4,3,2-de]cinnolin-3-ones in good yields. A possible reaction mechanism was discussed using nonempirical quantum-chemical calculations.

6-Aryl-5-quinoxalinyl-1,3-oxazin-4-ones were obtained by thermolysis of 5-aryl-4-quinoxalinylfuran-2,3-diones in the presence of tert-butylcyanamide, 4-morpholinecarbonitrile, and N-cyanobenzamide.

The complex [(C4H9O)(3)P=O](2)ZnCl2 was synthesized. Its effects on urethane-formation kinetics via reaction of hydroxyl-containing oligomers and isocyanates were studied by IR spectroscopy; on polyurethane curing kinetics, by a rheological method. It was established that [(C4H9O)(3)P=O](2)ZnCl2 was an effective catalyst that accelerated the initial step of regular structure formation during the synthesis of multi-component polyurethanes with low curing temperatures.

Adamantyl-substituted imidazolium salts were synthesized on the basis of abietane derivatives. The products were tested as N-heterocyclic carbene ligands in the palladium-catalyzed Sonogashira reaction.

Impedance method was used to measure the electrical conductivity of benzoic acid melts, and the concentration of free protons in these melts was estimated. IR spectroscopic data are presented and the existence of benzoic acid in melts in the form of molecules is suggested.

Addition of 1,3,3-trimethyl-3,4-dihydroisoquinolines to N -benzylideneanilines gives substituted N -[2-(3,3-dimethyl-3,4-dihydroisoquinolin-1-yl)-1-phenylethyl]anilines, whereas 2′,5′,5′-trimethyl-4′,5′-dihydro-4 H -spiro[naphthalene-1,3′-pyrrol]-4-one reacts with N -benzylideneanilines along two pathways involving cyclization to substituted 2,3,3a,4,10,11-hexahydrobenzo[ f ]pyrrolo[2,3- d ]quinolin-5(1 H )-ones or elimination of the aniline residue with formation of substituted 5′,5′-trimethyl-2-styryl-4′,5′-dihydro-4 H -spiro[naphthalene-1,3′-pyrrol]-4-ones.

The free-radical copolymerization of 1,1,3,3-tetraethyl-2,2-diallylguanidinium chloride and maleic acid in bulk and organic solvents forms copolymers with a high tendency of monomer units toward alternation. It is shown that 1,1,3,3-tetraethyl-2,2-diallylguanidinium chloride undergoes copolymerization with maleic acid to give rise to pyrrolidinium structures in the cyclolinear polymer chain.

The influence of the concentration of iron(III) tris(acetylacetonate) on the physicomechanical and rheological properties of polyurethane composites prepared by cold curing was examined.

Acid-base properties of 2′,2′-diethylheptanohydrazide (DEHH) and its complex formation with copper(II) ions in water-isopropanol solutions were studied. Cationic complexes with [Cu 2+ ] : [DEHH] ratios of 1 : 1 and 1 : 2 were found to be formed in weak acid media, and an uncharged complex with a [Cu 2+ ] : [DEHH] ratio of 1 : 2 was found to be formed in a basic medium. log K st values were determined. The data obtained were compared with the stability constants of copper(II) 2′,2′-diethylbenzohydrazide complexes.

Extraction of vanadium(V) with solutions of 2-ethylhexanoic acid N′,N′ -dialkylhydrazides in kerosene from acidic media was studied. The optimal extraction conditions were determined depending on the concentrations of H 2 SO 2 , HCl, and the extraction agent; the composition of the recovered complexes was proposed. The conditions for back-extraction of vanadium(V) from the organic phase were studied. It was found that benzoic acid N′,N′ -diheptylhydrazide did not recover vanadium(V) from acidic media.

We have used Fourier transform IR spectroscopy to study the kinetics of reaction between phenylisocyanate and oligomeric polyols at room temperature. We have determined the degree of conversion and the reaction rate constants for urethane formation.

Complex formation of Cu(II), Co(II), Ni(II), and Zn(II) ions with nonsymmetric 1,2-diacylhy-drazines (DAHs) in ammonia solutions was studied. [M(II) : [DAH] ratios were found by equilibrium slope, isomolar series, and conductometric titration methods to be 1 : 1 and 1 : 2 for Cu(II), 2 : 1 and 1 : 1 for Co(II), 2 : 1 and 1 : 1 for Ni(II), and 1 : 1 for Zn(II). Independent of the [M(II) : [DAH] ratio, we have isolated only complexes of composition 1 : 1 from ammonia solutions. The composition was confirmed by IR spectroscopy and elemental analyses. The solubility products of solid complexes of 1 : 1 composition and the complex formation constants were calculated with considering the states of ligands and metal ions in ammonia solutions. The solubility products of the solid complexes were found to depend on the length of radical in DAHs.

The conditions for the preparation of mesoporous silicon dioxide in water-alkali, alcohol-alkali, water-ammonia, alcohol-ammonia, and acid media were determined and its textural characteristics were studied.

The methods of synthesis of some new derivatives of abietane including pyridines and indoles fused with diterpene skeleton were described.