Alkylation of anionoid intermediates in the reaction of benzofuran with lithium in hexametapol

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.     

Synthesizing of silver nanoparticles by thermal implantation of its ions in ED-20 epoxy oligomer

Stable silver particles of 39 nm in diameter were synthesized by the thermal implantation of its ions in ED-20 epoxy oligomer.     

Comparative structural characterization of the water dispersions of detonation nanodiamonds by small-angle neutron scattering

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.     

Recognition of Stochastic System States for Continuous-Discrete Observations with Sliding Memory

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...     

Aggregation and stabilization of shungite carbon nanoparticles

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.     

Ritter reaction. Synthesis of 1-substituted 3,3,7,9-tetramethyl-2-azaspiro[4.5]deca-6,9-dien- and -1,6,9-trien-8-ones and 7-methoxy-3,3,6,8-tetramethyl-3,4-dihydroisoquinolines

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.