Formation of furan derivatives in the course of the Stevens rearrangement of ammonium salts containing 4-allyloxy(phenoxy)-2-butynyl group

Ammonium salts containing phenacyl group in combination with 4-allyloxy(phehoxy)-2-butynyl group, when treated with a suspension of potassium hydroxide in benzene, undergo the 3,2-Stevens rearrangement with the formation of allenic amino ketones which under the reaction conditions give the furan derivatives.     

X-ray Phase Contrast at Diffraction Focusing of a Spherical Wave in a Short-Period Superlattice

The possibility of reconstructing the internal structure of one-dimensional phase objects at diffraction focusing of X-ray spherical wave was investigated. As a crystal analyzer a strongly absorbing wedge-shaped short period superlattice with a rib parallel to the diffraction vector was used in symmetric Laue geometry case. It is shown that by moving a phase object along the direction of diffraction vector one can bring different satellites in the focusing condition. It is possible to restore an additional wave phase acquired in the phase object by recording the entire map of obtained data.     

Modification of the MgO–Al2O3–TiO2–SiO2 Glass by Silver Diffusion for the Formation of Luminescent Molecular Clusters

Doklady Chemistry - The capabilities of diffusion treatment of alkali-free MgO–Al2O3–TiO2–SiO2 glass using Ag-containing salt melts or special pastes for the formation of...     

Atomic structure of nickel phthalocyanine probed by X-ray absorption spectroscopy and density functional simulations

The local atomic structure of Ni in nickel phthalocyanine was studied by K-edge X-ray absorption fine structure spectroscopy. The obtained inter atomic nickel-nitrogen distance differs from the reference X-ray diffraction data so an additional study was performed within density functional theory framework. The justification of the used theoretical approach was provided by a comparison of theoretical free electron densities of states with experimental Ni K-edge X-ray absorption near edge spectra. The refined Ni local environment retain the reference structure of the molecule except for the length of Ni-N bond which increases to 1.90 Å.     

Thermal conductivities of polymers at various temperatures and pressures

The authors describe an apparatus and method for investigating the coefficient of thermal conductivity of high-density and low-density polyethylene, polypropylene, polyorthochlorostyrene, and polyparachlorostyrene in relation to temperature and pressure.     

Transformation of acoustic waves in upper atmosphere

The transformation of acoustic waves into electromagnetic oscillations in the plasma of the upper atmosphere is analyzed. It is demonstrated that acoustic oscillations in ionosphere in the presence of the gradients of gas temperature and electron concentration lead to plasma vortices that provide the generation of electromagnetic waves.