Elementorganic Compounds Research Articles

SYNTHESIS, CHEMICAL MODIFICATION AND GROWTH-STIMULATING ACTIVITY OF N-BENZYLMETHYLAMINE AND INDOLINE DERIVATIVES

One of the main tasks of organic chemistry is development of purposeful synthesis ways of biologically active substances. The chemistry of dithiocarbamic compounds opens up wide possibilities for solving this problem. There is a strong interest in dithiocarbamic acids due to a wide range oftheir biological activity (anticancer, antibacterial, antifungal, anti-neurodegenerative, anti-tuberculosis, growthstimulating, root forming, etc.). The purpose of this studyis the synthesis of biologically active substances inthe series of element(N-,O-,S-,F-,Cl-)organic compounds based on N-benzylmethylamine and indoline, their structure determination and biological activity investigation. Results and discussion. The initial sodium dithiocarbamates were synthesized by the reaction of N-benzylmethylamine and indoline with carbon disulfide in the yields 92 and 52%. Acylation of synthesized dithiocarbamates with acid chlorides was carried out and the corresponding derivatives of dithiocarbamic aromatic and heterocyclic thioanhydrides were obtained in the yields 58-85%. The structure of the synthesized compounds was identified by using elemental analysis, IR spectra, 1Н and 13С NMR spectroscopy. Laboratory study of growth-stimulating activity of new biologically active compounds onlaboratory germination and germination energy of wheat and soybean seeds was carried out.Conclusion.The best results were achieved when wheat seeds were treated with sodium indoline-1-carbodithioate and benzyl(methyl)carbamothio-4-fluorobenzoic thioanhydride at 0.001% concentration.Germination energy and laboratory seed germination were 100% and 100%, and for the standard -80% and 90%, respectively. It was found that seed treatment with new synthesized preparations intensively stimulates the growing and germination of wheat shoots in comparison with the control and the standard.

Повышение износостойкости поверхностей трения сферических подшипников скольжения финишным плазменным упрочнением

The technology of finish plasma strengthening (FPS) with the multi-layer nano-coating of the Si-O-CN system as applied to the friction surface strengthening in spherical journal bearings is considered. This method relates to the processes of tubeless chemical precipitation of coatings at atmosphere pressure with the use of volatile fluids of element-organic compounds and gas environment with the simultaneous activation of a surface by electroarc plasma. The essence and distinguishing features of FPS are analyzed. Tribological characteristics of an applied wear resistant antifriction coating are investigated which stipulate for wear resistance increase in spherical journal bearings.

Fused-Ring Bulky “Rind” Groups Producing New Possibilities in Elemento-Organic Chemistry

Abstract Kinetic stabilization with sterically bulky substituents or ligands has played a pivotal role in exploring a large variety of unsaturated compounds or low-coordinated complexes. This article describes our findings that a series of fused-ring octa-R-substituted s-hydrindacenyl groups (Rind groups), which we developed since 2007, can act as unique protecting groups both in main group chemistry and in transition-metal chemistry. The synthesis, structures, and properties of various types of highly reactive unsaturated and low-coordinated element-organic compounds of Groups 1, 2, 8, 11, and 13–17 featuring the bulky Rind groups are covered.

Synthesis and Molecular Structure of N-{(1R,5S)-3-Methyl-8-Oxo-1,3,4,5,6,8-Hexahydro-2H-1,5-Methanopyrido[1,2-α] [1,5]Diazocin-9-yl}Acetamide

Compound 2 was isolated by column chromatography over SiO2 in 67% yield and had mp 171–172°C (MeOH) and [ ]D 20 –16.0° (c 0.72, CHCl3). The crystal and molecular structure of 2 were established by an x-ray crystal structure analysis (XSA), for which crystals of 2 were grown by slow crystallization from MeOH. The asymmetric unit of the unit cell of 2 contained two molecules (2a and 2b) that had very similar structures. Figure 1 shows a general view of the symmetry independent molecules 2a and 2b. The compound crystallized in chiral space group P21 and contained two chiral centers (1R,5S). The absolute configuration was the same as that of starting (–)-cytisine. The diazabicyclononane had a chair–half-chair conformation, which is often observed in similar compounds [6–10]. The amide was practically coplanar with the aromatic ring. As we supposed, the trans-orientation of the C9–N1 (C9 –N1 in the second independent molecule) was explained mainly by steric considerations. Thus, the acidic amide proton and the carbonyl O1 atom were oriented on the same side. This favored the formation of the H-bonded dimer. In fact, the two symmetrically independent 2a and 2b were joined in the crystal structure into a dimer through N1–H1...O1 (H...O 2.37 A° , N...O 3.235(2) A° , 1, i.e., when the crystal structure consisted of more than a single independent molecule [11–14]. Apparently, this was due to limitations imposed by the symmetry, which prevented the molecules from adopting the optimum orientation relative to each other. Crystals of C14H19N3O2 (MW 261.32) at 100 K were monoclinic, a = 11.4769(10), b = 9.4595(8), c = 12.9183(11) A ° , = 106.697(2)°, V = 1343.4(2) A° 3, space group P21, Z = 4, dcalc = 1.292 mg/m 3. A data set of 19,378 reflections was collected on a Bruker Smart Apex2 CCD diffractometer ( Mo K -radiation, 2 max = 64°). The starting set of measured intensities was processed using the SAINT and SADABS programs included in the APEX2 program suite [15]. The structure was solved by direct methods and was refined by anisotropic full-matrix least-squares methods over Fhkl for non-hydrogen atoms. The H atoms were placed in geometrically calculated positions with the exception of the amide H, the position of which was located in a difference electron-density synthesis. Then, the N–H distance was normalized to 0.90 A° . The H atoms were refined using a rider model. A total of 4910 independent reflections (Rint = 0.0395) were used in the refinement. The refinement over all independent reflections gave wR2 = 0.1019 [R1 = 0.0422 over 4267 reflections with I > 2 (I)]. All calculations were performed using the SHELXTL programs [16]. Atomic coordinates and thermal factors were deposited in the Cambridge Crystallographic Data Centre (CCDC 981034). Thus, the structure of N-[(1R,5S)-3-methyl-8-oxo-1,3,4,5,6,8-hexahydro-2H-1,5-methanopyrido[1,2-a][1,5]diazocin9-yl]acetamide was characterized for the first time by an XSA. The existence of two symmetrically independent molecules in its crystal structure was explained. 1) Institute of Elementorganic Compounds, Russian Academy of Sciences, 119991, GSP-1, Moscow, B-334, Ul. Vavilova, 28; 2) Institute of Organic Chemistry, Ufa Scientific Center, Russian Academy of Sciences, 450054, Ufa, Prosp. Oktyabrya, 71, e-mail: tsipisheva@anrb.ru.; Translated from Khimiya Prirodnykh Soedinenii, No. 3, May–June, 2014, pp. 501–502, original article submitted January 17, 2014. N N

Micro- and nanostructures of carbon in Pt-low-sulfide ores of the talnakh deposit (Siberian platform)

1193 Finds of graphite, bitumen, and carbonaceous matter in magmatic rocks and ores of various compo� sitions provide evidence for the participation of hydro� carbon fluids in petrogenesis and ore formation. Hydrocarbons are able to extract chemical elements and transport them as element-organic compounds and produce carbonbearing phases and ore concen� trations upon dissociation (1). Consequently, the asso� ciation of graphite and noble metals in ores is not acci� dental and explains the relationships between the high concentrations of platinoids and graphite and/or bitu� men occurrences in "tubes" of the Nizhnii Tagil Mas� sif (2), in dunite pipes (3, 4), and in Merenskii reef of Bushveld (5), in ores of Stillwater (6), and in deposits of the Norilsk and Dzhaltul-Khungtukunskii types (7-9). Detailed study of graphite on the microstruc� tural level in was not carried out for these objects. Cur� rently researchers are greatly interested in nanosized graphite manifestations known as graphenes, fullerenes, graphite tubes, and other structured forms of carbon. The optimal conditions of obtaining of var� ious nanomaterials are now being studied. Until now finds of carbon nanostructures in natural objects have been extremely rare. Graphite nanostructures from metamorphic rocks of the Grenville province (Can� ada) and graphitebearing alkaline pegmatites of the Kola Peninsula (10, 11) are examples of those close to synthetic structured carbon by morphology. Natural microand nanostructures of graphite are of special scientific interest for understanding the possible con� ditions and mechanisms of their formation (12), as well as the possible participation of metal-organic compounds in this process.

Influence of the Silicon- and Element-Organic Compounds on the Process of Biochemical Oxidation in the Organic Contaminations

One of the methods used in practice for the purification of wastewater from vegetable-processing enterprises is biological method of aerobic purification. With the aim to increase air-tank capacity used in traditional systems of biochemical purification of wastewater, different ways effecting to the process of vital activity of microorganisms of active sludge are applied. On the one hand, using the compositions of different salts and complex organic biogenous supplements prevents from the accumulation of some anions in the amounts exceeding the limited concentration, on the other hand- allows different groups of microorganisms to choose biogenous elements, which they assimilate easily and fully. It is known, that compounds of silicon and germanium can cause stimulating effects [1] to the organisms of active sludge. The goal of present studies is the intensification of biological processes of oxidation of organic contamination in wastewater by new bio-degradable chemical compounds or compositions on their basis, and by bio-sorbents.

Principle of Absorption Spectrum Measurement of the Layers Adsorbed on Transparent Substrates

The principle of measurement of spectrum absorptances nanolayers of the elementorganic compounds, based on use of the optical fibre measuring converter is described.

Characterization of refuse-derived char from municipal solid waste: 2. Occurrence, abundance and source of trace elements

The trace elements in refuse-derived char (RDC) generated by thermolysis of municipal solid waste (MSW) were studied to elucidate their occurrence, abundance and source. The content, enrichment factor, concentration trend, distribution, nature and modes of occurrence of major, minor and trace elements in RDC and RDC ash were characterized. It was found that a number of trace elements (Ag, Cd, Cl, Cr, Cu, Ho, I, Pb, Pr, Re, Sb, Sm, Sn, and Zn) in RDC have concentrations significantly higher (enrichment factor ≥10) than the respective Clarke (worldwide averaged) values for coals. The distribution of trace elements such as Cr, Cu, Mn, Ni, Pb, Sb, and Zn, is controlled mostly by the organic matter, clay minerals and Fe oxyhydroxides, and in some cases by carbonates, sulphates, phosphates, chlorides and alloys. Organics, heavier, magnetic, fine and especially accessory minerals and phases in RDC are concentrating phases for these trace elements. Trace elements in RDC may be present, in decreasing order of significance, as: element-organic compounds; impurities in the mineral matter; major components in the mineral matter; major and impurity components in the inorganic amorphous matter; and elements in the fluid constituents. This characterization also reveals those elements that have the greatest potential for environmental impacts or for possible resource recovery. The results show that the effective economic and environmental management of MSW and RDC requires a long-term strategy based on a detailed understanding of the source, formation, behaviour and fate of the modes of trace element occurrences in MSW, RDC and combustion waste residues.

Geochemistry of coals, coal ashes and combustion wastes from coal-fired power stations

Contents, concentration trends, and modes of occurrence of 67 elements in coals, coal ashes, and combustion wastes at eleven Bulgarian thermoelectric power stations (TPS) were studied. A number of trace elements in coal and coal ash have concentrations greater than their respective worldwide average contents (Clarke values). The highest values in coal ash are displayed by elements such as Rb, Cs, Ba, Cu, Sb, Bi, U, and Ag. Trace elements are concentrated mainly in the heavy accessory minerals and organic matter in coal. In decreasing order of significance, the trace elements in coal may occur as: element-organic compounds; impurities in the mineral matter; major components in the mineral matter; major and impurity components in the inorganic amorphous matter; and elements in the fluid constituent. A number of trace elements in the waste products, similar to coal ashes, exceed known Clarke contents. Trace elements are mainly enriched in non-magnetic, heavy and fine-grained fractions of fly ash. They are commonly present as impurities in the glass phases, and are included in the crystalline components. Their accessory crystalline phases, element-organic compounds, liquid and gas forms, are of subordinate importance. Some elements from the chalcophile (Cu, Zn, Ga, Ge, Pb, As, Sb), lithophile (Be, Ba, Ce, Hf, Sr, La, Zr, Mo, U) and siderophile (Sc, Cr, V) groups may release into the atmosphere during coal burning. For others, the combustion process appears to be a powerful factor causing their relative enrichment in the fly ash and rarely in the bottom ash and slag. Considerable amounts of Hf, some chalcophile elements (Zn, As, Tl, Pb) and Ag from stack emissions have probably entered the soil near TPS. Trace elements can also occur in water soluble forms in the fly ash (Li, Sr, Mo, Cs, V, Cr, Mn, As, Bi, B, F, Cl, Br, I) and probably contaminate the surface and subsoil waters. Some trace elements (Sr, Ba, Yb, Sc, Cd, Tl, Pb, Bi) may accumulate in the vegetation near TPS.

Mineralogy and geochemistry of Bobov Dol coals, Bulgaria

The mineralogy, elemental composition, and modes of occurrence of 49 elements in nine composite samples of Bobov Dol high-ash coals were studied by optical microscopy, scanning and transmission electron microscopy, X-ray diffractometry and chemical analysis. The major minerals were quartz, kaolinite, illite, plagioclase and K-feldspar and the minor minerals and phases were pyrite, marcasite, siderite, calcite, dolomite, gypsum, muscovite, montmorillonite and volcanic glass. The accessory minerals include a wide variety of minerals, such as galena, pyrrhotite, magnetite, hematite, goethite, chromite, rutile, anatase, corundum, gibbsite, biotite, chlorite, zircon, enstatite, garnet, jarosite, alunite, barite, polyhalite, aragonite, ankerite, witherite, apatite, halite and sylvite. The modes of occurrence and some genetic peculiarities of the above-mentioned minerals are described. Thirty-three elements occurred in concentrations higher than the respective Clarke values; especially S, Rb, Nb, Hf, Zn, Cu, Pb, Mn, Ti and U. The concentration trends and modes of occurrence of the trace elements are also discussed. In decreasing order of significance, the trace elements probably occur as element-organic compounds, as impurities in the mineral constituents, as major components in the minerals, as major and impurity components in the inorganic amorphous constituents, and in the fluid constituents. The Bobov Dol coals have undergone complex syngenetic, diagenetic and epigenetic mineralization processes associated with hydrothermal and volcanic activities. These processes were also accompanied by intensive tectonic movements and, possibly, by a later change from continental to marine sedimentation in the area after burial of the coal.

Trace elements in solid waste products from coal burning at some Bulgarian thermoelectric power stations

The content, concentration trend and mode of occurrence of 40 trace elements in coal mixtures (coals and host rocks), fly ash, bottom ash and lagooned ash at four Bulgarian thermoelectric power stations (TPS) have been characterized. A complex of methods: separation, atomic emission and ICP spectroscopy, neutron activation, XRF, SEM, TEM, XRD, etc., was used. Trace elements in coal mixtures are concentrated mainly in the heavy fractions (above 2.9 g cm −3), authigenic minerals and organic matter; and to a lesser extent are present in the major detrital minerals and host rocks. A number of elements in the waste products, like coal mixtures (ash), exceed known Clarke contents. These are mostly the siderophilic, some lithophilic (Rb, Nb, Mo, Ba, REE, Hf) and chalcophilic (Cu, Zn, As) elements and U. The trace elements show different concentration trends in fly ash, but are more typical for non-magnetic, heavy and fine-grained fractions. They are commonly present as impurities in the glass phases, and are included in the structure of mineral phases. The accessory crystalline phases, element-organic compounds, liquid and gas forms, are of subordinate importance. Some elements, mostly from the chalcophilic (Cu, Zn, Ga, As, Sn, Sb) and lithophilic (Be, Y, Zr, Nb, Mo) groups, plus Co and U, show scattering trends into the atmosphere. For others, the combustion process appears to be a powerful factor causing relative increase in the fly ash. Considerable amounts of trace elements from stack emissions (Hf, As, Tl, Pb, etc.) have probably entered the soil near TPS. Trace elements can also occur in watersoluble forms (Li, Mo, Cs, halogen elements, V, As, Bi, etc.) in waste products and accumulate (Sr, Ba, Pb, etc.) in dump vegetation.

ChemInform Abstract: Studies of the Synthetic Application of Elementorganic Compounds of Group 15 and 16. Part 102. Tertiary Stibine. Part 1. Reaction of . omega.‐Bromoacetophenone with Aldehydes Mediated by Diphenylantimonyorganometallic Reagents.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Studies of the synthetic applications of element-organic compounds of 15th and 16th Groups. 97. Pentaorganylstiborane. 2. Reactions of pentaorganylstiboranes with acyl chlorides and ketones

Studies of the synthetic applications of element-organic compounds of 15th and 16th Groups. 97. Pentaorganylstiborane. 2. Reactions of pentaorganylstiboranes with acyl chlorides and ketones

Zum isolobalen Modell in der elementorganischen Chemie

AbstractThe present paper tries to give a survey of the isolobal model in the elementorganic chemistry. The term “isolobal” was introduced by R. Hoffmann in 1976, but the concept of the electronic relationships or electronic resemblance is older. To reconstruct the elementorganic compounds one need to know the electronic structure of the organic and inorganic fragments. For the bonding in these compounds it will suffice that we know the frontier orbitals of the fragments — in other words the valence active orbitals of each fragment. Two fragments are isolobal if number, symmetry properties, approximate energy and shape of the frontier orbitals and the number of electrons in them are similar — not identical, but similar. Hoffmann introduced a symbol for the isolobal relationship: a “two‐headed” arrow with half an orbital below. One use of the isolobal model is in the structural sense. The model allows us to see the, simple essence of seemingly complex structures. This model is also very useful in synthesis of the elementorganic compounds. In this review are discussed the fundamentals and the applications of the isolobal model.

An investigation of the mechanism of the reation of allyltriethylstannane with bromotrichloromethane by radiofrequency probing and chemically induced dynamic nuclear polarization (CIDNP)

The methods of radiofrequency probing (RFP) and chemically induced dynamic nuclear polarization (CIDNP) have been used to study the mechanism of the reaction of allyltriethylstannane with bromotrichloromethane. The CIDNP effects which have been detected prove the presence of radical stages in this reaction. An assumption has been made about a possible radical pathway for the β-decomposition of elementorganic compounds.

Spectral-luminescent properties and the nature of electron states of molecules with heteroatoms

UDC 535.37:541.6:543.422 One of the problems of modern molecular spectroscopy is to establish a relation between the structure of molecules and their spectral-luminescent properties. Heteroatoms havea considerable effect on the rate constants of electron transfers, and the energy and nature of the electron states. An investigation of the dependence of the spectral-luminescence properties of molecules on the nature of a heteroatom is necessary in view of the recent rapidly developing use of element-organic compounds in different areas of science and technology. The present paper investigates the change in the spectral-luminescence characteristics as a function of the contribution of the orbitals of the heteroatom to the electron shell of the molecule. We investigated molecules with the general formula Ph3M, where Ph is C6H5, and M is N, P, As, Sb, and Bi. The molecules are characterized by the fact that the electrons of an unshared pair of the heteroatom situeted in l-orbitals participate in ~-delocalization. The electron transitions of such molecules can be regarded as the superposition of transitions of an aromatic system and transitions with (l, v*) charge transfer [i]. The electron absorption and luminescence spectra of derivatives of group V elements are characterized by displacement of the maxima of the bands towards the short-wave end in a number of N, P, As, and Sb derivatives, and the complete absence of a vibrational structure, which indicates a considerable degree of perturbation of the v-system by the l-orbitals of the heteroatom. In Fig. 1 we show the fluorescence spectra of the molecules investigated. Photodissociation occurs when the Ph3P, Ph3As, PhsSb and PhsBi molecules are irradiated with ultraviolet light. The fluorescence spectrum of the products of photodissociation is shown by the broken curve in Fig. i. When the unshared pair of electrons of the heteroatom in the electron-acceptor solvent becomes coupled, there is a considerable reduction in the extinction coefficient, and a vibrational structure of the benzene-type occurs in the absorption spectrum (Fig. 2). This confirms the suggestion that the unshared pair of electrons of the heteroatom (l-orbitals) participate in the form of the electron spectra of the molecule. An investigation of the temperature dependence of the absorption spectra of the molecules with heteroatoms leads to the same conclusions [2]. To solve the problem of the participation of the l-orbital of the heteroatom in the formation of the electron shell of a molecule we used the CMDO method with a limited configurational interaction. We took into account up to 60 single excited configurations in the configurational interaction. As the atomic number of the heteroatom increases, for a correct description of the excited states of the molecules investigated it was necessary to take into account a large number of configurations. Thus, for the Ph3Sb molecule we used 52 configurations~ a further increase in the number of configurations did not lead to any change in the spectral-luminescent characteristics calculated. At the same time, for the Ph3N molecule it was possible to confine ourselves to 33 configurations. The Ph3P and Ph3As molecules occupy an intermediate position. No general criterion is at present available for choosing the parameters for carrying out a CMDO calculation, and the parameters proposed by different authors differ considerably [3]. We used the spectroscopic parameters (CMDO/S) proposed in [4], which gives an adequate description of the electron spectra. The parameters of the heteroatoms used for the calculation are shown in Table I.

Artificial food. 2. Possibilities of production of artificial foods

The research program elaborated in the Institute of Element-Organic Compounds of the Academy of Sciences of the USSR (INEOS) for the processing of proteins to liquid multi component-food-systems and their transformation into a gel-like condition became a kind of an independent scientific discipline. Thus production processes for different forms of artificial food on the basis of proteins of different origin could be developed.

Orbital‐charge ordering in crystals

physica status solidi (b)Volume 80, Issue 1 p. K9-K12 Short Note Orbital-charge ordering in crystals G. V. Ionova, G. V. Ionova Institute of Physical Chemistry, Academy of Sciences of the USSR, MoscowSearch for more papers by this authorS. P. Ionov, S. P. Ionov Institute of Element-Organic Compounds, Academy of Sciences of the USSR, MoscowSearch for more papers by this authorO. M. Pachev, O. M. Pachev Institute of Chemical Physics, Academy of Sciences of the USSR, MoscowSearch for more papers by this authorE. F. Makarov, E. F. Makarov Institute of Chemical Physics, Academy of Sciences of the USSR, MoscowSearch for more papers by this author G. V. Ionova, G. V. Ionova Institute of Physical Chemistry, Academy of Sciences of the USSR, MoscowSearch for more papers by this authorS. P. Ionov, S. P. Ionov Institute of Element-Organic Compounds, Academy of Sciences of the USSR, MoscowSearch for more papers by this authorO. M. Pachev, O. M. Pachev Institute of Chemical Physics, Academy of Sciences of the USSR, MoscowSearch for more papers by this authorE. F. Makarov, E. F. Makarov Institute of Chemical Physics, Academy of Sciences of the USSR, MoscowSearch for more papers by this author First published: 1 March 1977 https://doi.org/10.1002/pssb.2220800150Citations: 3AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Citing Literature Volume80, Issue11 March 1977Pages K9-K12 RelatedInformation

New method of synthesis of polyphenylene type polymers using polycyclocondensation of ketals

Journal of Polymer Science: Polymer Letters EditionVolume 11, Issue 9 p. 589-593 Article New method of synthesis of polyphenylene type polymers using polycyclocondensation of ketals V. V. Korshak, V. V. Korshak Institute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRSearch for more papers by this authorM. M. Teplyakov, Corresponding Author M. M. Teplyakov Institute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRInstitute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRSearch for more papers by this authorV. P. Chebotaryev, V. P. Chebotaryev Institute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRSearch for more papers by this author V. V. Korshak, V. V. Korshak Institute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRSearch for more papers by this authorM. M. Teplyakov, Corresponding Author M. M. Teplyakov Institute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRInstitute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRSearch for more papers by this authorV. P. Chebotaryev, V. P. Chebotaryev Institute of Element-Organic Compounds of the Academy of Sciences of the USSR Moscow, USSRSearch for more papers by this author First published: September 1973 https://doi.org/10.1002/pol.1973.130110906Citations: 16AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Citing Literature Volume11, Issue9September 1973Pages 589-593 RelatedInformation