Lead(II)thioindate has been obtained by interaction of indium(III)trisulphatewith lead(II)acetate in the water medium. The influence of precipitant surplus and pH-medium on completeness of precipitation and composition of the obtained compound has been considerer. Chemical analysis made it possible to determine the composition of the precipitate, the formula of which conforms to PbIn2S4.
With the purpose of accelerating the process of fine-grained concrete solidification on the basis of Ceyranchol volcanic ashes solution CaCl2 has been used. The method of mathematical planning of experiment helped optimize composition of alkaline-mineral fine-grained concrete with average density 1590-1670 kg/m3, ultimate strength at compression in dry condition of 136.8-362.3 kg/sm2 and softening ratio […]
Nickel containing catalysts have been prepared by means of synthetic zeolite (СаА, СаХ, NaX) impegnation method. Electron-acceptory centers have been examined using the method of derivatography by adsorption of acetone and its established that the powerful electron-acceptory cehters appears on the surface of these catalysts.
The analysis of scientific literary on the application of Ni- and Co-containing compounds as catalysts for asymmetric and thermal Diels-Alder reaction has been carried out.
Fast oxidation of porous silicon in air has been found to occur as combustion or an explosion. The combustion process takes place in porous layers having the thickness lower than 60mcm, while the explosion is observed in thicker layers. The explosion process is supposed to develop via thermal overheating due to exponential increase of the […]
The phase diagram of the GaSe-TlGaS2 system has been studied using differential thermal analysis, X-ray diffraction, microstructural analysis and microhardness and density measurements. It has been established that the system is a nonquasibinary part of quasiternary system GaS-GaSe-TlS. At room temperature the GaSe –based solid solution extends to 3,5 mol % TlGaS2 , and the […]
For the first time using methods of physical-chemical analysis the triple system Gd-Bi-S has been examined and its liquids surface projection constructed. The formation of 3 triple compounds of Gd4Bi2S9 , GdBiS and GdBiS3 composition being formed under perictectic reaction at 1100, 840 and 930oC established.
For the first time 1,3-dioxalane and 1,3-oxathiolane derivatives containing hydroxymethyl and halomethyl groups have been synthesized, their isomers isolated by chromatographic method. The configurational structures sis-, and trans- isomers of ((S,R)- (4-(bromomethyl)-1,3-dioxolan-2-yl)-(3a,b), ((S,R)- (5-(chloromethyl)-1,3-oxathiolan-2-yl)methyl benzoates (5a,b) have been completely assigned by 500 MHz 1H COSY NMR spectroscopy.
It has been shown that in the course of interaction of sodium chloride of 2-chloroacrylic acid with alkenyl and alkynylhalogenides (in the presence of triethylbenzylammonium chloride, at 80–85°C) with high yields appropriate, non-limiting ethers of 2-chloroacrylic acid are formed. It has been established that the synthesized haloid- containing ethers possess antiwear and antirub properties and […]