Vol 88, No 1 (2018)

Five solvates, [CdBr₂(DMF)]_n, [CdBr₂(DMA)]_n, [CdI²(DMF)]ⁿ, [Cd(DMF)₆][Cd₂I₆], and {[Cd(DMA)₆][Cd₅I₁₂]_n}_m, were isolated from the ternary systems CdX₂–L–H₂O (X = Br, I; L = N,N-dimethylacetamide, N,N-dimethylformamide) and characterized by the X-ray single crystal analysis. The structures of the first three solvates is similar to each other in structures and represent a one-dimensional polymer chain, the fourth solvate has the discrete structure containing [Cd(DMF)₆]²⁺ and [Cd₂I₆]^2– ions, and the fifth solvate contains discrete [Cd(DMA)₆]²⁺ cations and the polymer anionic fragment [Cd₅I₁₂]_n^2n–.

The synthesis of methyl esters has been carried out via the reaction of aliphatic and aromatic carboxylic acids with dimethyl carbonate in the presence of manganese and iron carbonyls. The optimal ratio of catalyst and reagents and other conditions for the synthesis of methyl esters of carboxylic acids with high yield have been found.

Hydrosilylation of allyl ethyl, allyl butyl, allyl glycidyl, allyl benzyl, and allyl phenyl ethers by 1,1,3,3-tetramethyldisiloxane in the presence of supported sulfur-containing platinum(II) complexes with the general formula [{SiO₂}O_2Si(Me)(CH₂)₃SR]₂PtCl₂ (R = Bu, Hex, Bn; {SiO₂} is silica surface) and side processes have been studied.

The reaction of pyridoxal with 2,4-dihydroxybenzaldehyde in a hydrochloric acid solution gave 1-(5-formyl-2,4-dihydroxyphenyl)-7-hydroxy-6-methyl-1,3-dihydrofuro[3,4-c]pyridin-5-ium chloride. Treatment of the latter with sodium hydride in ethanol afforded a free aldehyde in 85% yield. A series of azomethines and imidazolidines was obtained by reacting the obtained aldehyde with various amines and diamines.

Condensation reactions of isatin derivatives with 3,5-di(tert-butyl)-4-hydroxybenzyl acetate and the Girard’s reagent T has afforded a series of novel water-soluble isatin-3-acyl hydrazones containing a sterically hindered phenolic fragment in position 1 of the heterocycle; antimicrobial activity of the products has been estimated. It has been shown that the isatin derivatives with bromine or methoxy substituent in the benzo fragment as well as the acyl hydrazones containing 5-methyl or 5-ethyl group are the most active against Staphylococcus aureus and Bacillus cereus.

The reaction of ethyl 4-(chloromethyl)pyrazolo[5,1-c][1,2,4]triazine-3-carboxylates with thiourea in dimethylformamide involves ANRORC rearrangement (Addition of the Nucleophile, Ring Opening, and Ring Closure) followed by N-formylation to give N-{5-(4-oxo-8-phenyl-1,4-dihydropyrazolo[5,1-c][1,2,4]-triazin-3-yl)-1,3-triazol-2-yl}formamides whose structure was confirmed by X-ray analysis. The reaction mechanism has been studied by HPLC/MS.

The reactions of 1-imino-2-phenyl-1H-inden-3-amine with 3,5-diamino-1,2,4- and 2,5-diamino-1,3,4- thiadiazoles were used to synthesize linear 1: 2 and 2: 1 condensation products, as well as symmetrical macroheterocyclic compounds. The synthesized compounds were characterized by IR, UV, and ¹Н NMR spectroscopy.

The mechanism of electrophilic cleavage of the Si–Ph bond in 1,3-silaheterocyclohexanes is investigated. 3-Aryl-3-silatetrahydropyrans are shown to be less prone to the cleavage of the Si–Ph bond under the action of trifluromethanesulfonic acid than the corresponding 3-silathianes or silacyclohexanes. The effect of heteroatom (N, O, S) in the ring on the functionalization at the silicon atom in 1,3-silaheterocyclohexanes was studied experimentally by the method of NMR spectroscopy and theoretically by DFT calculations and the mechanism was suggested of dephenylation as a function of the nature of heteroatom.

A method of synthesis of silver glyconanoparticles with average particle size 15–40 nm and low polydispersity index based on available 3-thiopropionylhydrazones of mono- and disaccharides has been elaborated. The prepared compounds have exhibited high antifungal, antibacterial, and antiviral activity and are promising for further comprehensive study.

Lithium and sodium ion transport through membranes impregnated with a solution of 2-ethylhexyl hydrogen [bis(2-ethylhexyl)amino]methylphosphonate in kerosene has been studied. Factors determining the efficiency and selectivity of membrane extraction have been determined. Introduction of neutral aminomethylphosphine oxide into the membrane phase has been shown to enhance the selectivity for lithium ions.

Depending on the structure of the substituent at the endocyclic nitrogen atom, the reactions of aminomethylisatins with the Girard’s reagent T can proceed both with the elimination of the aminomethyl group and with its retention resulting in the formation of the corresponding positively charged isatin-3-acylhydrazones.

4-Chloro-6-[1-(vinylsulfonyl)pyrrolidin-2-yl]benzene-1,3-diol prepared by the reaction of 2-ethoxypyrrolidine with 4-chlororesorcinol was introduced into the aza-Michael reaction with various amines which led to the formation of new 1-sulfonyl-2-arylpyrrolidines

New bicyclic mono- and dibenzyl-substituted phosphonates based on resorcinol and methyl resorcinol were synthesized. Structure of the disubstituted bicyclic phosphonate was established by X-ray diffraction method.

Phosphonoethylated amino acetals were synthesized for the first time by reacting vinylphosphonates with α- and γ-aminoacetals. The reaction of 2-methylresorcinol with the acetals in ethanol in the presence of hydrochloric acid afforded the first representative of diarylbutylamines containing β-aminoethylenephosphoryl fragment.

A copper(II) complex of N,N'-bis(di-para-tolylphosphinoylmethyl)-1,8-diamino-3,6-dioxaoctane was synthesized and its crystal structure was established. The inner coordination sphere of the complex is a strongly distorted trigonal bipyramid. Coordination involves the phosphoryl oxygen atoms, nitrogen atoms, and ether oxygen atom, and one axial position is occupied by a water molecule.