Preparation and Insecticidal Activity of the First Organofluorine Insecticide Based on β-D-Ribofuranoside Monosaccharide

Russian Journal of General Chemistry - A method was developed for the synthesis of an organofluorine derivative of β-D-ribofuranoside. Biological tests revealed high insecticidal activity and...     

Effect of additives on the spectral analysis of dry residues from solutions—II: Electrode effects

The dry residues from solutions of additives were applied to the top surface area of the anode and burned in a d.c. arc of 8 A. Salts of alkali and alkaline-earth elements were used as additives. The anode temperatures are measured using a photoresistance connected with a compensating recording bridge. The electrode temperatures were found to depend on the anion of the additive and—to a lesser extent—on the nature of the metal. The additives could be divided into two groups and this division is based on the evaporation characteristics: halides gave steadily decreasing curves, nitrates and carbonates gave curves with plateaus. These differences are explained in terms of the thermochemical and thermodynamic properties of the corresponding compounds.     

Experimental measurement of the intensity of the spectral line CuI 324.7 nm and the concentration of Cu atoms in a hollow cathode discharge under pulsed and steady-state conditions

The intensity of the spectral line CuI 324.7 nm and the concentration of Cu atoms in a hollow cathode discharge were measured when operating the lamp under pulsed and steady-state conditions. The influence of the temperature regime of the cathode walls on the effect of the applied operation mode was investigated.     

Photometric and spectrochemical determination of gold in iron pyrites, copper and lead concentrates

A photometric and a spectrochemical method have been developed for determining gold in iron pyrites, copper and lead concentrates. In both, the sample is dissolved and gold is extracted from 1M hydrochloric add solution with a mixture of ethyl methyl ketone and chloroform (1:1). Gold was determined photometrically with N,N'-tetramethyl-o-tolidine. Conditions have been found for satisfactorily sensitive and reproducible spectral determination of gold. For this purpose the effect of various collectors and buffers on the evaporation curves of gold has been studied, as well as excitation conditions, form of the electrodes, optimum slit-width, and photographic variables. The sensitivity and precision of both methods have been evaluated.     

Chitosan–Tripolyphosphate Nanoparticles: Synthesis by the Ionic Gelation Method,Properties, and Biological Activity

Russian Journal of General Chemistry - Nanoparticles with an average size of ~100 nm were obtained by ionic gelation of chitosan (M 6.5×103 and 60×103 Da) in the presence of...     

Copper-containing catalysts for the oxidative dehydrogenation of organic compounds

A method of doping magnesium aluminum hydrotalcites, which are precursors for oxidative dehydrogenation oxide catalysts of various compositions, with copper(II) was developed, and copper(II)-containing oxide catalyst samples were synthesized. The catalytic properties of these catalysts were studied in the oxidative dehydrogenation of ethane, propane, and hexane. The conversion of ethane into ethylene on the copper-containing catalysts was established to proceed with high selectivities (90?C97%) and at low temperatures (400?C450°C).     

The effect of controlled atmospheres in the graphite arc method

The effect of different atmospheres-air, nitrogen, argon and helium-on the analytical properties of the “graphite arc” method used to analyse solutions were investigated. It was shown that the use of an argon atmosphere enables an analyst to achieve detection limits for elements with ionization potentials greater than 8.5 eV thirty to one hundred times lower than those that can be achieved in air.     

Ytterbium-Containing Oxide Catalysts for Oxidative Dehydrogenation of Hydrocarbons

Oxide catalyst samples for the oxidative dehydrogenation (ODH) of alkanes were prepared by heat treatment of precursors, namely, hydrotalcite-related magnesium aluminum double hydroxo salts containing ytterbium, as well as magnesium, aluminum, chromium, vanadium, molybdenum, and niobium in various combinations. Their catalytic activities were studied. Some catalysts were found to have high efficiency in ODH of ethane, propane, and isobutane, increasing the product yield and enhancing the reaction selectivity.     

Synthesis of complex hydroxo salts of magnesium, nickel, cobalt, aluminum, and bismuth and oxide catalysts on their base

Synthesis methods have been developed for the precursors of oxide catalysts that include the combination of magnesium nickel cobalt aluminum hydroxocarbonate, with a layered hydrotalcite-type structure and decavanadate and paramolybdate ions in the anion layers, and bismuth hydroxocarbonate. On the base of these precursors, multicomponent oxide catalysts have been manufactured for the oxidative dehydrogenation (OD) of light alkanes. Some of these catalysts showed high selectivities and high product yields in the conversion of ethane to ethylene.     

Magnesium iron aluminum hydroxosalts and oxide catalysts for oxidative dehydrogenation of alkanes and alcohols

Methods are developed for the synthesis of precursors for oxide catalysts containing iron hydroxocarbonate and magnesium aluminum hydroxocarbonate with hydrotalcite-type layered structure and decavanadate and paramolybdate ions in anionic interlayers. These precursors are used to synthesize oxide catalysts for oxidative dehydrogenation of alcohols and alkanes with high selectivity and good yields of the desired product in conversion of ethane to ethylene and alcohols to carbonyl compounds.