2-(5-Arylterphenyl-4-yl)quinolines from 2-methylquinoline and 1-(het)aryl-3-phenylprop-2-yn-1-ones in just a one step: A miracle of molecular interplay

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Analysis of precipitates in ultrafine-grained metallic materials

In the present work, new possibilities of the X-ray diffraction for investigations of the phase composition, size, shape and volume fraction of particles in ultrafine-grained ferritic/martensitic steel and the Cu-Cr-Zr alloy have been demonstrated. For the first time, the method of X-ray diffraction in the transmission mode was used to identify particles with a volume fraction of less than one percent in the ultrafine-grained materials studied. The small-angle X-ray scattering method was used to estimate the size and shape of dispersed particles. Specific features of the ultrafine-grained structure determined by the X-ray diffraction and transmission electron microscopy studies were used for estimation of dispersion hardening in the samples obtained by equal-channel angular pressing in comparison with the samples subjected to standard treatment.     

Simulation of tau neutrino interaction in an emulsion track detector

Simulation of the interactions between tau neutrinos ν_τ and the material of the emulsion track detector using Geant4 software is described. The purpose of the work is to generate artificial events and to estimate, on their basis, the reconstruction accuracy for the geometric parameters (vertex coordinates, impact parameters, and track kink angles) and distributions of these parameters used in the selection criteria of the OPERA experiment.     

Intramolecular [4+2] cycloaddition of furfurylsubstituted homoallylamines to allylhalides,acryloyl chloride and maleic anhydride

Acylation of 4‐(furyl‐2)‐4‐R‐aminobut‐1‐enes and 4‐R‐4‐furfurylaminobut‐1‐enes with maleic anhydride, acryloyl chloride or allylhalides provided 3‐aza‐10‐oxatricyclo[5.2.1.0^1,5]decenes. The tricycles are formed via an initial amide formation followed by a stereoselective exo‐IMDAF (Intramolecular Diels‐Alder of Furan). In case of competing cycloaddition (for compounds possessing two furan or two dienophilic moieties) the most substituted fivemembered cycle is preferably annulated. Refluxing of 4‐R‐4‐furfurylaminobut‐1‐enes in acetic anhydride led to exo‐3‐aza‐11‐oxatricyclo[6.2.1.0^1,6]undecenes with the pseudoequatorial substituent R‐4. Treatment of 3‐aza‐10‐oxatricyclo[5.2.1.0^1,5]decenes with PPA at 90?110°C promoted cyclic ether opening, aromatization and intramolecular cyclization reactions sequence to give the corresponding tetracyclic compounds — tetrahydroisoindolo[2,1‐a]quinolines and tetrahydroisoindolo[2,1‐b][2]benzazepines in good yields. Unusual products of ipso‐substitution in aromatic ring were obtained on cyclization of N‐p‐R‐substituted 2‐allyl‐4‐oxo‐3‐aza‐10‐oxatricyclo[5.2.1.0^1,5]dec‐8‐enes.     

Nuclear vertex constants and asymptotic normalization coefficients for 8Be resonance states from effective-range expansions for αα scattering

The properties of the first excited state of the ⁸Be* nucleus (2⁺) are studied. This state corresponds to the resonance in αα scattering at the energy of E _α = E ₂ ≈ 3 MeV. Use is made of an expansion of the effective-range function K(k ²). The function K(k ²) is sensitive to the value of E ₂. A fit to experimental data on the dependence of the Coulomb-nuclear phase shift δ ₂ ^C on the energy E _α leads to an E ₂ value that is smaller than the average value obtained from an analysis of various reactions. The experimental behavior of δ ₂ ^C (E _α) cannot be described satisfactorily by fixing the average value of E ₂. The renormalized nuclear vertex function for the process α + α → ⁸Be*(2+) and the asymptotic normalization coefficient for the respectiveGamow wave function are calculated by using the set of parameter values found in the present study.     

Synthesis of epoxyoxirano- and epoxydihydroxyisoindolones

1-Oxo-3a,6-epoxyisoindolones oxidized with potassium permanganate to give 4,5-dihydroxy-3a,6-epoxyisoindolones, while oxidation with peroxyformic acid or 3-chloroperoxybenzoic acid yielded 2,6a-epoxyoxirano[e]isoindolones. Oxidation proceeded with selective formation of exo-cis-adducts.     

Modeling the posture of a cerebral palsy patient with hamstring syndrome after surgical correction by the Zhuravlev procedure

Cerebral palsy patients with hamstring syndrome are characterized by an increased tension in the posterior two-joint muscles of the thigh. The upright posture of such patients takes the Z-shaped form. The operations according to the procedure proposed by Eggers and the tendon plastic operations proposed by Zhuravlev help the limbs to straighten. In this paper a mathematical model of the patient posture after a Zhuravlev operation is proposed. The numerical results obtained show that a patient underwent such an operation can maintain a relatively upright posture even with an increased tonus of the rectus muscle of the thigh. This is impossible for a patient after an Eggers operation.     

Fullerene model of silicon nanofibers

A computational (quantum-chemical) experiment has been performed on constructing a silicon nanofiber by gas-phase deposition. A model of two-step polymerization has been proposed in which a fullerene Si₆₀ molecule serves as the main structural unit. The formation of oligomers of the molecule containing from three to eight molecular units explains the discrete values of the fiber width observed experimentally. The formation of a “rouleau” of oligomers leads to fiber growth in terms of length. It is shown that both steps are favorable in energy with the decisive superiority of a high-spin state, which poses the question of considering silicon nanofibers to be molecular magnets.     

Translational diffusion coefficient of a nitroxide radical in an ionic liquid, as determined via EPR spectroscopy, cyclic voltammetry, and chronoammetry

Values of the translational diffusion coefficient of a spin probe (2,2,6,6-tetramethyl-4-oxypiperidine-1-oxyl) are determined via cyclic voltammetry, chronoammetry, and EPR in ionic liquid (1-butyl-3methylimidazolium tetrafluoroborate) at 295 K. They are found to be (8 ± 3) × 10^?12, (9 ± 3) × 10^?12, and (11 ± 4) × 10^?12 m²/s, respectively.