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1.

Вид документа : Статья из журнала
Шифр издания : 54/I-85
Автор(ы) : Filyakova T. I., Zapevalov A. Ya., Kodess M. I., Kurykin M.A., German L.S.
Заглавие : Isomerization of monohydroperfluoroalkenes [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1994. - Vol. 43, № 9. - С. 1526-1531
Систем. требования: http://www.springerlink.com/content/vp3621243236747u/fulltext.pdf
Примечания : 26.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Isomerization of monohydroperfluoro-1-alkenes HC(CF2)nCF=CF2 (n = 2 to 8) catalyzed by Lewis bases or acids (CsF, KHF2, and SbF5) under conditions of thermodynamic control affords equilibrium mixtures of all of the possible isomers resulting from migration of the double bond along the carbon chain. Under conditions of kinetic control, isomerization through the action of SbF5 gives -H-perfluoro-2-alkenes. The substantially higher proportion ofcis-isomers in the resulting monohydroperfluoroalkenes than in their perfluorinated analogs has been attributed to the effect of an intramolecular hydrogen bond
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1994, 43 (9), 1526.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 54/P 51
Автор(ы) : Marakushev A. A., Paneyakh N. A., Rusinov V. L., Pertsev N. N., Zotov I. A.
Заглавие : Petrological model of formation of giant ore deposits
Место публикации : Geology of Ore Deposits. - 1998. - Vol. 40, № 3. - С. 211-227
Примечания : Bibliogr. : p. 227 (46 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The available data on the giant ore deposits of chromium (Kempirsai in the Urals), platinum-group metals (Bushveld in Africa), platinum-bearing copper-nickel ores (Talnakh in the Noril'sk district, northern part of the Siberian Platform), zinc-copper (massive sulfide) ores (Gai, Sibai, and Uchaly) and apatite deposits (Khibiny, the Kola Peninsula) is summarized. The giant sizes of the deposits are caused by extraordinary ore-forming processes directly associated with the highly extensive petrogenetic processes. These processes resulted in the formation of peculiar dunites in the hyperbasite complexes (chromite ores), agpaitic urtites in alkaline associations (apatite deposits), development of low-sulfide horizons and hortonolite dunites in the basite-hyperbasite layered intrusions (platinum-group metal deposits), specific processes of transmagmatic sulfurization of the iron-rich igneous differentiates (Cu-Ni sulfide and massif sulfide ores), and processes of magmatic replacement of hyperbasites that cause the alkaline agpaitic affinity of magmatism. This agpaitic tendency increases the solubility of carbon-bearing fluid components (CO2, CH4, etc.) in magma and leads to the concentration of ore metals, which form chloride-carbonate and hydrocarbon migrating compounds in the transmagmatic fluids. Some mineralogical-petrological prospecting criteria are deduced on the basis of genetic models of giant ore deposits.
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3.

Вид документа : Статья из журнала
Шифр издания : 54/W 20
Автор(ы) : Rusinova O. V., Rusinov V. L., Abramov S. S., Kuznetsova S. V., Vasyuta Yu. V.
Заглавие : Wall Rock Alterations and Physicochemical Conditions of the Sovetsk Gold Deposit Formation (Enisei Ridge)
Место публикации : Geology of Ore Deposits. - 1999. - Vol. 41, № 4. - С. 276-294
Примечания : Bibliogr. : p. 294 (24 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The mode of distribution of carbonaceous matter (CM) and specific characteristics of the metasomatic zonation were studied, as well as physicochemical conditions of the ore deposition and wall rock alteration at the Sovetsk gold deposit. The deposit relates to the quartz vein low-sulfide type and is hosted by carbonaceous rock sequences ("black shales") within a wide shear zone. This shear zone spreads along the regional Ishimbin strike-slip deep fault. The Proterozoic Tatarsk-Ayakhtin granitic complex, intruding the ore bearing rocks, composes the core of the ore district. Granites compose a pluton roof, where Olimpiada and Veduga gold deposits occur, and in contact zones the Eldorado and Pereval'ninsk deposits are located. The Sovetsk deposit is situated farther from the pluton contacts. The rocks of the ore-bearing sequence are metamorphosed in the chlorite-muscovite greenschists facies. A specific feature of wall rock alteration is unclear lateral metasomatic zonation with gradual transition between zones and alternating bands of strong and weak alterations. The main metasomatic minerals are muscovite and chlorite. Quartz and carbonate are subordinate, and ilmenite, rutile, monoclinic, and hexagonal pyrrhotites are accessories. Above ore bodies turmaline is rather common, but inside and below ore bodies albite occurs. The distribution and zonation of metasomatic parageneses allow us to call this kind of wall rock alteration as "disseminated metasomatism." The rock alteration developed sinchroneously with dynamic metamorphism in the strongly anisotropic sheared rocks. The absence or low intensity of acidic metasomatism is an important feature of the deposit. The temperature of metamorphism was 500-460°C, of wall rock alteration - 460-350°C, and of ore deposition (from early to late stages) from 380 to 150°C. The disseminated CM was metamorphosed to the low graphitic stage, and the condensed CM in veinlets corresponds to the late antracitic stage. The fugacity of oxygen and sulfur in the fluids was estimated with ilmenite = rutile + pyrrhotite equilibrium, composition of pyrrhotite and chlorite. The oxygen fugacity was lower than that of the ilmenite-magnetite buffer, and sulfur fugacity was lower than that of the pyrite-pyrhothite buffer. Nearer to the ore bodies the sulfur fugaeity increases, and inside ore bodies it corresponds to the pyrite + pyrrhotite paragenesis. The calculations of the oxygen fugacity with the gas composition in the system C-O-H suggests that the ratios CO2/CH4/H2O are close to the QFM and ilmenite-magnetite buffers and similar to that received with some mineral fugometers. Hydrocarbons with 2-4 carbon atoms appear not to be in equilibrium with CO2. The variation intervals of pH, fo2 and (before the ore deposition) of T are rather narrow. The pressure under metamorphism exceeded 1.9 kbar, but it decreased to the beginning of ore deposition to 0.7 kbar. This means that ores were deposited in an extension environment.
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4.

Вид документа : Статья из журнала
Шифр издания : 54/D 62
Автор(ы) : Rusinov G. L., Beresnev D. G., Itsikson N. A., Chupakhin O. N.
Заглавие : Direct modification of benzoannelated crown ethers with 1,2,4-triazin-5(2H)-one moieties
Место публикации : Heterocycles. - 2001. - Т. 55, № 12. - С. 2349-2359
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A convenient method for one-step coupling of benzoannelated crown ethers with 1,2,4-triazinones based on the reaction of nucleophilic addition to unsubstituted carbon atom of the triazine ring has been worked out. It has been shown that the reaction of 3-substituted 1,2,4-triazin-5(2H)-ones (1) with benzocrown ethers (benzo-12-crown-4, benzo-15-crown-5, benzo-18-crown-6) in the presence of acetic or trifluoroacetic anhydride is accompanied by acylation of triazine ring and results in formation of 3-(1-acyl-5-oxo-1,4,5,6-tetrahydro-1,2,4-triazin-6-yl)benzocrown ethers (7-12). The latters were converted to 3-(5-oxo-2,5-dihydro-1,2,4-triazin-6-yl)benzocrown ethers (18-20) using two alternative routes: the elimination of acetic or trifluoroacetaldehyde or the deacylation followed by the oxidation of the 1,4,5,6-tetrahydro derivatives (13-15).
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5.

Вид документа : Статья из журнала
Шифр издания : 54/A 10
Автор(ы) : Chupakhin O. N., Rusinov G. L., Beresnev D. G., Charushin V. N., Neunhoeffer H.
Заглавие : A simple one pot synthesis of condensed 1,2,4-triazines by using the tandem AN-SNipso and SNH-SNipso reactions
Место публикации : Journal of Heterocyclic Chemistry. - 2001. - Т. 38, № 4. - С. 901-907
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A new synthetic approach to condensed 1,2,4-triazines based on using the tandem AN-SNipso and SNH-SNipso reactions has been developed. 5-Methoxy-3-penyl-l,2,4 1,2,4-triazine and its N1-methyl quaternary salt were found to react with C,N-, C,O- and N,N?-bifunctional nucleophiles (m-phenylenediamine, resorcinol, semicarbazide and ureas) into triazacarbazoles, benzofuro[2,3-e][1,2,4]-triazines, and 6-azapurine derivatives. In all cases nucleophiles attack first the unsubstituted C-6 carbon of the triazine ring, while the final stage is replacement of the methoxy group affording cyclization products.
\\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Journal of Heterocyclic Chemistry\\2001.v.38.p.901.Chupachin.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 54/H 10
Автор(ы) : Rykowski A., Chupakhin O. N., Kozhevnikov D. N., Kozhevnikov V. N., Rusinov V. L., Van der Plas H. C.
Заглавие : H-1 and C-13-NMR investigations on-adduct formation of 1,2,4-triazine 4-oxides and 3-chloro-6-phenyl-1,2,4-triazine with liquid ammonia and alkylamines
Место публикации : Heterocycles. - 2001. - Т. 55, № 1. - С. 127-133
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 1H- and 13C-NMR spectra of the ?-adducts formed between 6-phenyl-1,2,4-triazine 4-oxide (1a), 3-ethyl-6-phenyl-1,2,4-triazine 4-oxide (1b) and liquid ammonia, methylamine or dimethylamine are described, together with 1H NMR spectra of 3-chloro-6-phenyl-1,2,4-triazine (7) in liquid ammonia. The results of the NMR study have shown that the carbon C-5 in 1a-b and 7 is the preferred site for nucleophilic attack by liquid ammonia and alkylamines at low temperatures (from -75° to -20°C). The ?-adduct (5e) formed between 1a and dimethylamine at -75°C on heating to -20°C irreversibly converts to open-chain product (3a), via intermediary C-3 ?-adduct (6). The amination of 7 into 3-amino-6-phenyl-1,2,4-triazine (10) occurs via SN(AE) mechanism involving the isomerisation of the C-5 ?-adduct (8) into the C-3 ?-adduct (9) as confirmed by a 15N study with labeled liquid ammonia.
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7.

Вид документа : Статья из журнала
Шифр издания : 54/W 20
Автор(ы) : Rusinova O. V., Rusinov V. L., Syngaevskii E.D., Bochek L.I., Lapina M.I., Vasyuta Yu. V.
Заглавие : Wall Rock Metasomatism and Formation Conditions of the Silver-Polymetallic Bol'shoi Kanimansur Deposit (Tadjikistan)
Место публикации : Geology of Ore Deposits. - 2001. - Vol. 43, № 5. - С. 386-405
Примечания : Bibliogr. : p. 405 (20 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Products of the hydrothermal alteration of rocks and vertical zonality at the Kanimansur silver-polymetallic deposit (Tadjikistan) have been studied. On the basis of these studies, physicocochemical conditions of metasomatism and ore formation were reviewed. Condensed carbonaceous matter in wall rock metasomatites and ores were found and carbon isotopic composition of this carbonaceous matter and composition of gases in open pores in rocks of the deposit were analyzed. As a result of geological observations, analysis of mineral parageneses, compositions of minerals, and chemistry of wall rock alteration, the following four stages of the hydrothermal process were distinguished: autometasomatic, propylitic, preore chlorite-sericite, and synore. Mineral geothermometers were used to estimate the temperatures of metasomatism, which varied within the range 200-250°C for all stages except for the autometasomatic stage (450-500°C). The formation of unhydrated light micas, quartz, and highly ferruginuous chlorites was related to acid preore metasomatism. The stability of these chlorites testifies to a slight increase in the acidity of solutions during the preore stage (pH not less than 3.5). The wall rock metasomatites and sulfide ores are characterized by a relatively rare occurrence of pyrite due to a low activity of the sulfide sulfur during hydrothermal alterations (logaS2 = -7...-10). The low activity of the sulfide sulfur is confirmed by the fact that iron is tied in a highly ferruginuous chlorite. At upper ore levels, even zinc is tied in chlorite. This testifies to a much greater aS2 /aO2 value. Judging by the participation of carbonaceous matter in the process, ore components were deposited due to a local increase in the alkalinity at the ore-forming stage and oxidation of reduced fluids. The established features of metasomatic transformations, are related to particulars of the regional magmatism.????
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8.

Вид документа : Статья из журнала
Шифр издания : 54/Ч-92
Автор(ы) : Чупахин О. Н., Береснев Д. Г.
Заглавие : Нуклеофильная атака на незамещенный атом углерода азинов и нитроаренов - эффективная методология построения гетероциклических систем : обзор
Параллельн. заглавия :Nucleophilic attack on the unsubstituted carbon atoms of azines and nitroarenes as an efficient strategy for constructing heterocyclic systems
Место публикации : Успехи химии. - 2002. - Т. 71, N 9. - С. 803-818: схем. - ISSN 0042-1308. - ISSN 0042-1308
Примечания : Библиогр. : с. 817-818 (69 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Обобщены данные о новых методах синтеза конденсированных азинов с помощью нуклеофильной атаки на незамещенный атом углерода азинов и нитроаренов. Рассмотрены тандемы реакций нуклеофильного присоединения AN-AN, нуклеофильного присоединения-замещения AN-S(ipso)N, нуклеофильного замещения S(H)N-S(ipso)N и S(H)N-S(H)N, протекающих между азинами и бинуклеофилами; внутримолекулярные S(H)N-реакции в ряду азинов и нитроаренов, а также другие методы синтеза конденсированных гетероциклов, основанные на процессах нуклеофильного замещения типа S(H)N
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9.

Вид документа : Статья из журнала
Шифр издания : 54/N 64
Автор(ы) : Nikitin E. D., Popov A. M., Bogatishcheva N. S.
Заглавие : Vapor-Liquid Critical Properties of n-Alkylbenzenes from Toluene to 1-Phenyltridecane
Место публикации : Journal of Chemical & Engineering Data. - 2002. - Vol. 47, № 4. - С. 1012-1016
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: This paper gives experimental critical temperatures and pressures of 10 n-alkylbenzenes C6H5CnH2n+1 with the number of carbons in the side chain n = 1, 2, 4, 5, 6, 7, 8, 10, 11, and 13. n-Alkylbenzenes that are heavier than butylbenzene are thermally unstable at their critical points. The method of pulse heating of a wire probe placed into the liquid under study has been used. Residence times are from (0.01 to 1) ms. Equations for the correlation of the critical temperatures and pressures of n-alkylbenzenes with the number of carbon atoms in the side chain, molar mass, and normal boiling point have been obtained. The experimental critical constants of alkylbenzenes have been compared with the values calculated by the methods of Lydersen, Joback and Reid, and Constantinou and Gani
\\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2002, v.47, p.1012.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 54/S 73
Автор(ы) : Sosnovskikh V. Ya., Usachev B. I., Kodess M. I.
Заглавие : 2-Polyfluoroalkylchromones. 12. Nitration of 5,7-dimethyl-2-polyhaloalkylchromones and complete assignment of signals in the 1H and 13C NMR spectra of 5,7-dimethyl-2-trifluoromethylchromone and its mono- and dinitro derivatives [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2002. - Vol. 51, № 10. - С. 1817-1828
Систем. требования: http://www.springerlink.com/content/j5142173317h7g17/fulltext.pdf
Примечания : 27.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The nitration of 5,7-dimethyl-2-polyhaloalkylchromones affords either 5,7-dimethyl-6-nitro- or 5,7-dimethyl-6,8-dinitro-2-polyhaloalkylchromones, depending on the reaction conditions. Signals in the 1H and 13C NMR spectra of the sterically hindered chromones were completely assigned using the 2D NOESY, HETCOR, and COLOC spectra. The influence of nonplanar nitro groups on chemical shifts of carbon atoms was studied. Some spectral peculiarities of the peri-methyl group were revealed. The 1H-1H and 13C-1H spin-spin coupling constants, including the extreme six-bond long-range coupling between the protons of the Me(5) group and H(8), were determined
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2002, 51 (10), 1817.pdf
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