Pyrroles from ketoximes and acetylene. 45. A new route to 2,2-dipyrroles

The reaction of 1-methyl-2-acetylpyrrole oxime with acetylene at atmospheric and increased pressure can be catalyzed by KOH-DMSO superbase to give 1-methyl-2-(2-pyrrolyl)pyrrole, N-vinyl-2-[1-methyl(2-pyrrolyl)]pyrrole, and the reaction intermediate methyl-2-(1-methylpyrrolyl)-O-vinyloxime.See [1] for Communication 44.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 460–463, April, 1991.     

Synthesis of 2-(2-selenienyl)pyrrole from methyl-2-selenienylketoxime and acetylene

The reaction of methyl-2-selenienylketoxime with acetylene in KOH-DMSO gives 2-(2-selenienyl)pyrrole and its 1-vinyl derivative.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 708–710, May, 1992.     

Pyrroles from ketoximes and acetylene

2-(2-Furyl)pyrroles and 1-vinyl-2-(2-furyl)pyrroles were obtained in up to 80% yields in the reaction of ketoximes of the furan series with acetylene in MOH—dimethyl sulfoxide (M = Li, K) Superbase media.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1058–1061, August, 1981.     

Association and relative acidities of 2-substituted 5-trifluoroacetylpyrroles

The acidities of 2-substituted 5-trifluoroacetylpyrroles were studied by IR spectroscopy from the shift of the frequency of the NH stretching vibration (_NH) in the presence of dimethylformamide (DMF) relative to the band of vibrations of free NH. The existence of a correlation relationship between _NH and _I constitutes evidence that the acidities of pyrroles are determined primarily by the inductive effect of the substituents in the 2 and 5 positions of the pyrrole ring. The low probability of the formation of an intramolecular NH... O=C hydrogen bond in the investigated molecules was demonstrated.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 772–774, June, 1984.     

Crystallization specifics of carbonate-hydroxylapatite in the presence of strontium-containing agents

The effect of strontium-containing compounds on the crystallization of strontium-substituted carbonate- hydroxylapatite from a human synovial fluid prototype was studied. Synthesis products were investigated by FT-IR spectroscopy, X-ray diffraction, and differential thermal analysis. The amount of strontium in samples was determined by atomic emission analysis. For the synthesized phases, crystallite sizes were calculated by the Selyakov–Sherer formula, and the unit cell parameters were determined. The kinetically stable brushite phase was shown to transform into the more thermodynamically stable phase of strontium-containing carbonate-hydroxylapatite with increasing exposure time of precipitates under the mother solution. Some schemes were proposed for phase transformations under heat treatment.     

A Spectrophotometric Study of the Complexation of Magnesium(II) with a Number of Amino Acids in Aqueous Solutions

Russian Journal of General Chemistry - A spectrophotometric study of the complexation of magnesium(II) with glycine, L-aspartic, and L-glutamic amino acids in an aqueous solution at 298.15 K was...     

Effect of Oxygen on the Oxidation of Methane with Hydrogen Peroxide to Methanol in the Presence of Glutathione-Stabilized Gold Nanoclusters

Kinetics and Catalysis - The catalytic activity of glutathione-stabilized gold thiolate nanoclusters (1–2 nm) in the oxidation of methane with H2O2 and air oxygen in aqueous medium at...     

Trialkylsilyl- and 1-silatranylmethyl esters of 4-aminobenzoic acid

Conclusions Some previously unknown trialkylsilylmethyl and 1-silatranylmethyl esters of 4-aminobenzoic acid were synthesized.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 914, April, 1984.     

Determination of the elemental composition of human bone tissue by atomic emission spectral analysis

We have developed a procedure for quantitative determination of the elemental content (Ca, P, Mg, Fe, Mn, Al, Si, Sr, Ti) in human bone tissue by atomic emission spectral analysis. We have determined the metrological characteristics of this method. We have established the characteristic features of the qualitative and quantitative elemental content in pathology (using as an example bone tissue affected by coxarthrosis).     

Protective properties of gold in the composition of nanoparticles and Au—rutin complexes

Protective properties of gold nanoparticles and gold—rutin complexes were studied. Aurophilic bacteria Micrococcus luteus and methanotrophic bacteria Methylococcus capsulatus were studied. Gold—rutin nanoparticles and complexes protect the respiratory activity of the bacteria against toxins. Pretreatment of the cells with gold is more efficient than the treatment after the action of toxin.