Preparation and properties of polyfluorinated acrylamide-sodium acrylate copolymers

Preparation and properties of diluted aqueous solutions of a copolymer of polyfluorinated acrylamide and sodium acrylate have been studied. The polyfluorinated groups were introduced into the polymer via the reaction with 2,2,3,3,4,4,5,5-octafluorohexyl sulfurochloridite. It is shown that the introduction of polyfluoroalkyl fragments decreases the solutions viscosity and freezing point due to intermolecular interactions. The analysis of possible cluster structures formed by the functional groups has been performed.     

Cyclothiomethylation of heterochain α,ω-diamines with formaldehyde and H<Subscript>2</Subscript>S

Cyclothiomethylation was performed of heterochain (O, S-S, NH) α,ω-diamines with formaldehyde and H₂S in aqueous medium at 20–60°C to obtain new α,ω-bis(1,3,5-dithiazinanes). The cyclocondensation of N-(3-aminopropyl)butane-1,4-diamine (spermidine), formaldehyde, and H₂S proceeds efficiently in the medium of BuOH-H₂O at 0°C and leads to the formation of previously unknown O,S-containing macroheterocycle, 1,7-dioxa-3,5,9,11-tetrathiacyclododecane. A fungicidal activity was found in 5,5′-(3,6-dioxaoctane-1,8-diyl)bis-1,3,5-dithiazinane with respect to microscopic fungi affecting agriculture.     

An efficient catalytic method for the synthesis of 2,7-dialkyl-2,3a,5a,7,8a,10a-hexaazaperhydropyrenes

An efficient method for the synthesis of 2,7-dialkyl-2,3a,5a,7,8a,10a-hexaazaperhydropyrenes in high yields (up to 95%) via the intermolecular cyclization of 1,4,5,8-tetraazadecalin with N,N-bis(methoxymethyl)-N-alkylamines in the presence of SmCl₃·6H₂O as the catalyst has been developed.     

Thermochemistry of myricetin flavonoid

The enthalpies of myricetin dissolution are measured by means of calorimetry with mol dilutions of flavonoid: 96 mol % ethanol equal to 1: 9000, 1: 18000, and 1: 36000. The standard enthalpies of dissolution for the biologically active substance in an infinitely diluted (standard) solution of 96% ethanol are calculated from the experimental data. Physicochemical means of approximation are used to estimate the values of the standard enthalpy of combustion, and the enthalpy of melting is calculated for the investigated flavonoid. Finally, the compound’s standard enthalpy of formation is calculated using the Hess cycle.     

Iron aspartate complexes and model processes of their formation

Complexation of iron(II) and iron(III) ions with aspartate anions was studied by measuring oxidative potentials. The empirical formulas, stability constants, pH ranges, and mole fractions of the resulting iron aspartate complexes were determined using an oxidative function and a new concept of modeling complexation equilibria.     

Synthesis of α,ω-bis-1,5,3-dithiazepanes and their fungicidal properties

A procedure was developed for preparative synthesis of α,ω-bis-1,5,3-dithiazepanes by heterocyclization of aliphatic α,ω-diamines with N,N,N′,N′-tetramethylmethanediamine and 1,2-ethanedithiol. The fungicidal activity of 1,2-bis(1,5,3-dithiazepan-3-yl)ethane and 3,3′-(3,6-dioxaoctane-1,8-diyl)bis-1,5,3-dithiazepane toward microscopic fungi affecting agricultural plants was studied.     

Phosphate Derivatives of Natural Lactones. I. Synthesis of Novel Isoalantolactone Dialkylphosphonates

Novel isoalantolactone dialkylphosphonates were synthesized in 70-87% yields by reacting this eudesmanolide with dialkylphosphites. Their structures were proved by spectral analysis using IR, PMR, ¹³C and ³¹P NMR, and two-dimensional ¹H-¹H (COSY) spectroscopy. The reaction of isoalantolactone with dialkylphosphites is highly stereoselective.     

Features of reactions of phthalic anhydride with polyfluorinated alcohols

Polyifluoroalkyl mono- and diesters of phthalic acid were obtained by the reaction of phthalic anhydride with polyfluorinated alcohols. The structure of the polyfluoroalkyl phthalates was studied using IR and ¹H, ¹³C NMR spectroscopy. The nature of the associative interactions between cyclohexanone and polyfluorinated alcohols was revealed.