Acylation of amides substituted with pyridine-3-
sulfonic acids oxalil-chlorides and phosgene was
studied. New pyridil-3-sulfonil isocyanates were
synthesized. The conditions for this synthesis were
optimized by taking into account the detailed
understanding of this acylation. The synthesized
pyridine-3-sulfonyl isozyanates were converted to
pyridine-3-sulfonyl ureas. Biological activity of the
new compounds was studied and the substances with
high herbicidal effect were found
To develop the novel herbicide antidotes for the
sunflower vegetative plants, the group of chemical
compounds, belonging to the derivatives of
isoxalopyrazolopyridines was synthesized and their
antidote activity both in the laboratory and field
experiments was studied. The compounds with a high
antidote effect were found
3-Pyrrol-1-ylthieno[3,2-b]pyridin-2-carboxylic acid[(phenyl, 1,3-benzodioxol-5-yl)methylen]-hydrazides were synthesized by the reaction of
3-pirrol-1-ilthieno[2,3-b]pyridine-2-carbohydra-zides with aromatic aldehydes
In this article the review about the results of syntheses of new derivatives of pyrasoles,I soxazoles and pyridines, containing furan fragment is given. New methods of the syntheses of material are offered and estimation of their biological activity is made
New 2-R-4-hydroxymethyl-6-methylnikotinates of alkaline metals are synthesized by alkaline hydrolysis of derivatives 6-methyl-1,3-dihydrofuro-[3,4-c]pyridine-3-on
Surface energy of polymers determines such
important properties of polymers like wetability,
adhesion, ability adsorption of low molecular weight
substances. Inner organization, the structure of the
polymer and the dynamics of interaction between
macromolecular chains are shown at last. At the same
time, the micro-defects (inhomogeneity) of polymers,
which is an integral part of the structure are changed
during deformation and must contribute to changing
of the surface energy and its components.
This article solves the task of detecting changes in the
parameters of surface energy of polymers under
uniaxial deformation. Data for the quantitative
indicators of the surface properties total surface
energy and its dispersive and polar components are
presented. The calculations showed that the disperse
and polar components of all the samples of polymer
materials are about 98% of the total and, therefore, is
crucial. For the first time experimental data,
illustrating the change of surface energy of polymeric
materials had been obtained, including elastomeric
compositions, when uniaxial deformation. The
relative changes of the surface energy vary from 54.5
per cent to 125 %. A decrease of total surface energy
and its dispersion component is observed during
deformation of polymer samples of different structure
and chemical nature
Since the industrial revolution a huge amount of pollutants
emitted annually into the water most of which is
occupied by toxic metals. These metals widely distributed
in the environment and of accumulation of a
threat to human health. It is known, that cadmium and
zinc at high concentrations have a negative impact on
nature. In modern wastewater treatment technology we
widely use polymeric sorbents with chelating properties.
The use of polymeric chelating sorbents (PCS)
usage allows separating individual or group trace elements
from large volumes of solutions of complex
composition, lowering the limit of detection, eliminating
or reducing significantly the impact of macrocomponents
which increases the cleaning efficiency.
The article presents the results of a study of conditions
of interaction of zinc (II) ions and cadmium (II) with
PCT - polystyrene-azo-o-phenol-azo-rhodanine. We
found the optimal values of the conditions for zinc (II)
ions and cadmium (II) sorption. We investigated the
effect of interfering of the macro- and micro- water
components with the sorption of the ions studied.
Maximum desorption of metal ions is achieved by
washing the concentrate with 10 ml of 2M hydrochloric
acid. The data indicate availability of the investigated
sorbent for concentration and separation of zinc
(II) ions and cadmium (II)
The results of investigation of melanoidin’s formation
early stages in acidic ethanolic D-glucose – p-toluidine
model system are presented. Based on the elemental
analysis, IR- and UV-spectroscopy data obtained we
have shown, that in system studied Amadori
rearrangement product undergo the aryl amine
elimination during browning to form a nonnitrogenous
reductons with antioxidative activity in
processes of linoleic acid oxidation. It is also noted,
that in system studied inhibition of carbohydrate’s
destruction occurs because of non-reactive O-ethylglycosides
formation. The data obtained may be useful
for technology of carbohydrate-containing raw
material
In the article the mathematical model of the space charge region in the bipolar membrane is considered. The structure of the space charge region under passing of electric current, and without electric current is discussed. The results of experimental studies of water dissociation in the bipolar membrane in the presence of chromium(III) are discussed
The article is devoted to the application of method of differential-scanning microcalorimetry for research of phase-transitive materials on the base of inorganic and organic substances.