Nitroazines. 6. Direct introduction of indole residues into 6-nitroazolo[1,5-a]pyrimidines

Non-charge-activated 6-nitroazolo[1,5-a]pyrimidines have been reacted with indoles, and the effects of substituents in the azole moiety of the substrate molecule have been examined.For communication 5, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenni, No. 11, 1544–1549, November, 1986.     

Synthesis of 1-substituted-3,3-dimethyl-3,4-dihydroisoquinolines

The Ritter reaction between -substituted propionitriles and dimethylbenzylcarbinols gives 3,3-dimethyl-3,4-dihydroisoquinolines containing substituents in the 1-position corresponding to those in the starting nitrile.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 657–659, May, 1991.     

Interaction of a low-pressure gas flame and heterogeneous catalytic processes on the reactor surface

Conclusions (1) It was shown that the Semenov theory in various modes of chain termination quantitatively describes oxyhydrogen combustion near the first ignition limit with allowance for the interaction between the flame and the catalytic processes on the reactor wall. (2) Numerical modeling of oxyhydrogen ignition in the diffusion-controlled chain-termination mode detected the dependence of the rate “constant” for heterogeneous chain initiation on the model of the reaction in the gas. (3) For the first time, the change in the specific rate of heterogeneous chain initiation during a single ignition was determined. (4) method for controlling the low-pressure flame mode by affecting tubes far from the reactor was proposed and applied. Original Russian Text ? E.N. Aleksandrov, S.N. Kozlov, N.M. Kuznetsov, 2006, published in Doklady Akademii Nauk, 2006, Vol. 407, No. 5, pp. 630–633. Presented by Academician A.E. Shilov October 5, 2005     

Effect of mechanical activation on the catalytic, physical and chemical properties of copper oxide

Mechano-chemical activation of copper oxide powders leads to structural disordering of the near-surface layers of particles and, thus, to considerable variations in the catalytic properties of copper oxide.

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Functions of Pairs of Unbounded Noncommuting Self-Adjoint Operators under Perturbation

Doklady Mathematics - For a pair $$(A,B)$$ of not necessarily bounded and not necessarily commuting self-adjoint operators and for a function f on the Euclidean space $${{\mathbb{R}}^{2}}$$ that...     

Nitroazines 24. stable anionic σ-adducts of condensed nitrotriazines

Stable anionic -adducts of azolo-ring condensed 1, 2, 4-traizines with water were synthesized, and their x-ray structural analysis was carried out.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 52–57, January, 1994.     

Numerical Simulation of Rayleigh–Bènard Instability in Solutions Containing Ions of Three Types

The conditions for appearance of a Rayleigh–Benard instability (RBI) induced by a constant current between two horizontal electrodes in solution containing electroactive ions and indifferent electrolyte (system with three kinds of ions) are analyzed. It is taken into account that all the components take part in the formation of buoyant forces. The problem is solved for a stationary case (as an expansion to a series by a small parameter), and then equations for low perturbations are solved by the Galerkin method. The calculation is performed with a program that accounts for any number of members in a Galerkin expansion. A diagram is obtained, which determines conditions for the RBI emergence in terms of ratios of partial Raleigh numbers. The ratio of diffusion coefficients for supporting cations and anions significantly affects position of the boundary dividing ranges of convective stability and RBI in a diagram of nonequilibrium phase transitions.     

Synthesis of enaminoamides of the 1,2,3,4-tetrahydroisoquinoline series

Enaminoamides of the 1,2,3,4-tetrahydroisoquinoline series having the Z-configuration were synthesized by the reaction of dialkylbenzylcarbinols cyanaceamides.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1239–1242, September, 1989.     

Relative rate constants of reactions of alkyl radicals of methacrylates and acrylates with oxygen and stable nitroxyl radicals

Conclusions In methacrylates and acrylates undergoing oxidation, stable nitroxyl radicals react with the alkyl radicals of the monomers. The relative rate constants of the reactions of and O₂ with alkyl radicals for the different esters range from 0.36 to 5.20.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 753–756, April, 1977.We thank V. A. Golubev for providing the stable nitroxyl radicals.     

Synthesis and crystal structure analysis of binary molybdate CsNamoO4 · 2H2O

Single crystals of CsNaMoO₄ · 2H₂O were synthesized, and the crystal structure of this compound was determined from X- ray diffraction data (SYNTEX P2₁ automatic diffractometer, MoK_α radiation, 2252 reflections, R =0.037). Crystals are orthorhombic, space group P2₁2₁2₁ with unit cell dimensions a =6.379(1), b =8.625(1), c =13.671(2) å, Z =4. The structure of the binary molybdate consists of continuous columns of face- sharing Na octahedra with attached MoO₄ tetrahedra. The neighboring columns are linked by the Cs cations and the hydrogen bonds of the water molecules entering into the coordination polyhedra of the Na and Cs atoms.