Scientific Journal of KubSAU

Polythematic online scientific journal
of Kuban State Agrarian University
ISSN 1990-4665
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172 kb

ABOUT AN INTERACTION OF 3-AMINOTHIENO[2,3-b]PYRIDINE-2-CARBOX-AMIDES WITH AROMATIC ALDEHYDES UNDER CONDITIONS OF ACID CATALYSIS

abstract 1111507039 issue 111 pp. 695 – 707 30.09.2015 ru 925
The present article belongs to the area of organic chemistry, namely, to chemistry of heterocyclic compounds. For the purpose of optimization of a method of synthesis the threecyclic heteroaromatic systems containing a pyridi-ne, thiophen and pyrimidine ring in one molecule, - tetrahydropyridothienopyrimidinon and dihydropyri-dothienopyrimidinon – reaction 3-aminothieno[2,3-b]-pyridine-2-carbokxamides with aromatic aldehydes is studied, some of which contain pharmacolodical groups. Reaction was carried out in the conditions of an acid catalysis – is used p-TsOH. Influence of the nature of solvent (toluene, ethanol, mix ethanol-dimethilform-amide (1:1)) on the course and the direction of reaction are studied. It is established that carrying out reaction in toluene leads to the dihydropyrimidine containing in situation 2 phenyl, 4-bromphenyl deputies. In the presence in a molecule of initial aldehyde of the deputy in orto-situation tetrahydropyrimidine are formed. Use of ethanol mainly leads to formation of a tetrahydro-pyrimidine ring. Boiling of initial substances in mix ethanol-DMF yields the results similar to use of toluene, but time of reaction is reduced twice. The way of receiving the dihydroderivatives short-term boiling of tetrahydropyrimidine is found in mix isopropanol-DMF (a volume ratio of solvents 1:3). Identity of the received substances is proved by method of a thin layer chroma-tography. The structure of the synthesized connections is confirmed with the element analysis. The structure of tertagidropirimidinon and digidropirimidinon is proved with use of data of IK and NMR 1H of the spectral analysis
196 kb

ABOUT COMPARATIVE POLARITY OF As=N AND P=N GROUPS

abstract 0781204019 issue 78 pp. 222 – 233 30.04.2012 ru 1550
By the method of the dipole moments the connections of (p-XC6H4)3As=N-C6H4-Y series have been examined. The method of the vector-statistical analysis of the dipole moments helped to define the ranges and directions of the moments of (Сар)3As=N-Cар, (Сар)3As=N и N-Cар series. There has been shown that the substitution of the para-assistants X and Y in aromatic groups doesn't lead to an additional interaction influencing the electronic properties of the (Сар)3As=N-Cар group. The comparative analysis of the (Сар)3Э=N-Cар (Э=P, As) group moments specifies the essencial shift of the electron density to Сар(N) when replacing atom P to As
215 kb

ABOUT POLARIZATIONS EFFECTS IN THE RANKS OF ЭХ3 MOLECULES

abstract 0991405018 issue 99 pp. 256 – 265 30.05.2014 ru 1621
Correlations between experimental dipoles moments and values of the difference of first potentials ionization of atoms and molecules (ΔE) for three -coordinated molecules of types ЭХ3 (Э=N, P, As, Sb are carried out; X=F, Cl, Br, I ) are described. Exponential functions of dependence μ= f(ΔE) for rows ЭF3 andЭCl3 are received. Within the valence of shell electron pair repulsion theory it is shown, that the molecular dipole moments can be divided to dipol moments of ions of separate atoms, which, naturally changing, are transferred in the ranks of molecules ЭХ3
250 kb

ALTERNATIVE MODEL OF CALCULATIONS OF VALUES OF ATOMIC RADIUS

abstract 1321708051 issue 132 pp. 616 – 627 31.10.2017 ru 569
The article presents the results of the development of an alternative model for calculating the values of atomic radius. A formula was derived for calculating the atomic radius of the elements of the Periodic System of DI Mendeleev. The optimal calculation conditions for the proposed model are found. It is shown that the curve of the dependence of the value of the correction coefficient x on the atomic number of the element in form coincides with the dependence of the ionization energy on the charge number
4132 kb

ANALYSIS OF PHASE DIAGRAMS OF DOUBLE SYSTEMS OF FAT ACIDS

abstract 0530909004 issue 53 pp. 40 – 47 30.11.2009 ru 2480
The article is devoted to research of binary mixtures of fat acids by means of experimental and calculation methods
222 kb

ANALYSIS OF PHASE PLOTS OF STEARINE-PALMITINE-MIRISTINE FATTY ACIDS TRIPLE SYSTEM

abstract 0661102012 issue 66 pp. 133 – 142 28.02.2011 ru 1968
The article is devoted to the research of triple mixtures of fatty acids by means of experimental and calculation methods
281 kb

APPLICATION OF THE MASS-RADIAL MODEL OF CALCULATION OF ATOMIC RADIUMS FOR ISOTOPES OF CHEMICAL ELEMENTS

abstract 1311707072 issue 131 pp. 872 – 887 29.09.2017 ru 429
The article presents the results of studies of changes in the atomic radii of isotopes of the elements of the periodic table. With using the mass-radial model of calculations, the values of atomic radii for isotopes of chemical elements were obtained. It is shown that the atomic radius of different isotopes of one element is different and depends on the mass and radius of the nucleus. To study the changes in ∆Rav values in the groups and periods of the Periodic Table of Chemical Elements, the ∆Rav dependences on the period number and group number are constructed. It is found that the values depending on the number ∆Rav period / group for the d-elements lie in the low ∆Rav values for selements - in high ∆Rav values, and p-elements - in average values ∆Rav. It is shown that when the atomic nucleus is increased by 1 neutron, the atomic radius increases from 0.01 to 4.76 pm, which is due to the physical effect inside the atom
7278 kb

ASC-ANALYSIS OF THE DEPENDENCE OF THE SIZES OF ATOMS OF CHEMICAL ELEMENTS ON THEIR MAIN CHARACTERISTICS

abstract 1341710055 issue 134 pp. 685 – 710 29.12.2017 ru 627
Studying natural phenomena in all their diversity, humanity worked experienced in every field of science the model of perceiving the world and methods of obtaining information. The development of science currently cannot be imagined without research on the intersection of its regions. This article presents the results of the automated systemcognitive analysis of the size of atoms from the main characteristics that are of research at the interface of General chemistry elements and intelligent systems. Dependence of nuclear radius, mass and of the atom and the charge number are identical in shape and size, which is probably connected with the linear increase of these parameters in the Periodic system of chemical elements. There is also a similar form of the dependences of radii of atoms from the factors ex and x, because these factors are interrelated. The obtained results of the ask analysis have confirmed the theoretical assumptions and the formulae of the dependence of main characteristics of the atom
137 kb

BASIS OF SYNTHESIS OF MODIFIED SORBENTS AND SORPTION OF HEAVY METALS FROM WASTE WATER OF INDUSTRIAL ENTERPRISES

abstract 0921308059 issue 92 pp. 885 – 893 31.10.2013 ru 1768
In the article we have estimated sorption capacity of sorbents and analyzed the factors influencing it; we have also selected the optimal conditions for the sorption process, depending on the circumstances and nature of the treatment facilities. The possibility of purification of oil-contaminated water from heavy metal ions synthesized inorganic sorbent has been shown
572 kb

BOUT REGULARITIES OF CHANGES OF VALENT ANGLES AND POTENTIALS OF IONIZATION IN THE RANKS OF ЭХ3 AND ЭХ2 MOLECULES

abstract 0951401056 issue 95 pp. 980 – 993 30.01.2014 ru 1413
Correlations between values of the differences of first potentials ionization of atoms and molecules (ΔE) and valency angels α for three coordinated molecules of types ЭХ3 (Э=N, P, As, Sb are carried out; X=F, Cl, Br, I, CH3), and also ЭХ2 (Э=O, S, Se, Te; X = CH3, SiH3, GeH3) are described in this article. It is shown, that the entered value ΔE can serve as additive measure of change of the valency angle α in the basic and raised stances. We have also established that the functional dependences correlate with changes in the of hybridization of orbitals and the R parameters characterizing the interaction of electronic pairs near the central Э atom
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