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É. A. Karakhanov S. Kh. Sharipova M. I. Rozhkova E. A. Viktorova 《Chemistry of Heterocyclic Compounds》1978,14(1):15-16
It is shown that the principal pathway in the reaction of benzofuran with a solution of lithium in hexametapol is opening of the furan ring of benzofuran to give a dilithium derivative. Mono- and dialkylation products are formed when the reaction mixture is treated with alkylating agents. It was established by the use of alkylating agents with different degrees of hardness that the oxygen atom is a softer polarizable center than the sp-hybridized carbanion center.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 22–23, January, 1978. 相似文献
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Venediktov E. A. Rozhkova E. P. Koifman O. I. 《Russian Journal of Applied Chemistry》2012,85(3):477-478
Stable silver particles of 39 nm in diameter were synthesized by the thermal implantation of its ions in ED-20 epoxy oligomer. 相似文献
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O. V. Tomchuk M. V. Avdeev V. L. Aksenov V. M. Garamus L. A. Bulavin S. N. Ivashevskaya N. N. Rozhkova N. Schreiber J. Schreiber 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2012,6(5):821-824
The structure of nanodiamond water dispersions prepared under different conditions was investigated by small-angle neutron scattering at the scale of 1 to 100 nm. The study of diluted dispersions was regarded as of paramount importance. Similarly to previous studies, strong clustering of particles was revealed in the solutions. The typical size of clusters (40 nm and above) depends on the modification of the dispersions. A common property can be distinguished for different systems: the fractal dimension of the clusters is in the range of 2.3?C2.4, which indicates that there is a common clustering mechanism in such systems. Using contrast variation, the existence of a nondiamond component in the colloidal particles of the dispersions was confirmed; it correlates with the presence of a graphene shell on crystallite surfaces. 相似文献
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N. N. Rozhkova 《Russian Journal of General Chemistry》2013,83(13):2676-2685
Globular clusters of natural shungite carbon appear to be aggregates formed by nonplanar graphenes through stable aqueous dispersion. The ability of the clusters for spontaneous disaggregation in water and stabilization without surfactants was demonstrated. Due to their size and curvature, shungite graphenes contribute most substantially to stabilization of the carbon clusters in water and predetermine amphiphilicity of shungites. The condensation of aqueous shungite nanocarbon dispersion is accompanied by formation of a three-dimensional network with characteristic micro- and submesopores of <0.7–5.0 nm. The pore structure is distinguished by a changeable sorption capacity due to mobility of the graphene fragments forming the pore walls. 相似文献
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Yu. S. Rozhkova K. A. Galata T. S. Vshivkova Yu. V. Shklyaev 《Russian Journal of Organic Chemistry》2013,49(7):1055-1061
1-(4-Methoxy-3,5-dimethylphenyl)-2-methylpropan-1-ol reacted with nitriles [MeSCN, PhCN, MeCN, EtOC(O)CH2CN] in the presence of concentrated sulfuric acid to give both 1-R-3,3,7,9-tetramethyl-2-azaspiro[4,5]deca-6,9-dien- and -1,6,9-trien-8-ones and 1-R-7-methoxy-3,3,6,8-tetramethyl-3,4-dihydroisoquinolines. The reaction with 3,4-dimethoxyphenylacetonitrile afforded 10,11-dimethoxy-1,3,6,6-tetramethyl-1,5,6,12b-tetrahydrodibenzo[d,f]indole-2,8-dione. Three-component condensation of 2-methoxy-1,3-dimethylbenzene with isobutyraldehyde and nitriles led to the formation of spirocyclic systems and 3,4-dihydroisoquinoline derivatives in lower yield. 相似文献
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Russian Physics Journal - The paper describes the problem of finding the likelihood ratio for specific problem of stochastic system recognition in continuous time to member functions within... 相似文献