Formation of 2-phenyl-γ-benzpyrone (flavone) in nucleophilic thiylation of 1-(2′-hydroxyphenyl)-3-phenylprop-1-yn-1-one by potassium p-thiocresolate

The mechanism of formation of 2-phenyl--benzpyrone (flavone) in nucleophilic thiylation of 1-(2hydroxyphenyl)-3-phenylprop-2-yn-1-one by potassium p-thio-cresolate has been established by IR and PMR spectroscopy.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 601–602, May, 1986.     

Reduction of Trivalent Chromium Ions on Stationary Mercury Electrode in Concentrated LiCl Solutions

The effect of supporting-electrolyte (LiCl) concentration on the first stage Cr(III) + e Cr(II) of Cr(III) reduction on a stationary mercury electrode is studied by linear voltammetry. It is found that an increase in the LiCl molar concentration m from 0.4 to 7 weakly affects the position of the cathodic current peak potential E _P1 corresponding to this process. In the mentioned concentration range, [Cr(H₂O)_{6 – n} Cl _n ]^{3 – n} (0 n < 3) ions are preferentially reduced. The further increase in m up to 19.1 results in a substantial positive shift of E _P1, which is associated with the formation (upon passing the complete hydration limit) of the [Cr(H₂O)₃Cl₃] (n = 3) complex, which is followed by its reduction.     

Strength and wear resistance of nanocrystal structures on friction surfaces of steels with martensitic base

The formation of nanocrystal -martensite structures (NCS) in the surface layers of carbon and alloy steels under conditions of sliding friction and abrasion is investigated by electron microscopic, x-ray, and metallographic methods. The influence of the dynamic strain aging of martensite and strain dissolution of the carbide phase on the strength (microhardness and shear resistance) and tribological properties (wear resistance and friction coefficient) of nanocrystal surface layers of steels with martensitic base is demonstrated. The role of nanocrystal martensite in adhesive, abrasive, and fatigue wear resistance of steels is examined. The negative influence of the oxidizing air environment on the effective strength and wear resistance of friction NCS is demonstrated. The increased resistance of friction NCS of high-carbon steel to softening after tempering and friction heating is established.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 65–80, August, 2004.     

Reaction of ethynyl ketones with o-phenylenediamine

2,4-Diaryl-3H-benzo-1,5-diazepines were obtained by reaction of ethynyl ketones with o-phenylenediamine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1421–1422, October, 1973.     

2-(2-pyridyl)-3-thioindan-1-one: Synthesis,tautomerism, and complexing properties

Chelate and molecular complexes of 2-(2-pyridyl)-3-thioindan-1-one were prepared. The structure of the ligand (prevalent tautomeric form), including the coordination mode, was proved by ¹H NMR, IR, and EXAFS spectroscopy and by quantum-chemical calculations. The soft-hard properties of the ligand were demonstrated.     

Effect of carbon on accumulation of deuterium in beryllium irradiated with stationary plasma

Beryllium targets placed in the PLAST beam-plasma discharge facility were irradiated with a flux of stationary deuterium (D) plasma with a deuterium ion energy of 200 eV and plasma flux density of 3 × 10²⁰ m^?2 s^?1 at temperatures of 370 and 670 K. The irradiation doses varied from 5 × 10²¹ to 10²⁴ m^?2. To heat the target and to ionize impurities near its surface the target was irradiated with an electron beam. The deuterium concentration at the target center exceeds its concentration at the periphery by a factor of more than two under all irradiation conditions. The target center was enriched with carbon up to 16–24 at %, as compared to 4–6 at % at the target periphery. The [D]: [Be] atomic concentration ratios at the target center were equal to 0.054 and 0.036 against 0.024 and 0.016 at the periphery at temperatures of 370 and 670 K, respectively. It has been found that these ratios depend on the concentration of carbon atoms which trapped deuterium atoms.