A series of (η 6 -arene)tricarbonylchromium derivatives of 1,4-dihydro-3,1-benzoxazines was synthesized and characterized. The compounds were obtained by two alternative methods, namely, by the reaction of triammine(tricarbonyl)chromium with 1,4-dihydro-3,1-benzoxazines (method A ) and by the condensation of (η 6 -2-aminobenzyl alcohol)tricarbonylchromium with various aldehydes and ketones (method B ). The composition and structure of obtained compounds were established by different physicochemical methods of analysis, such as HPLC, UV, IR, 1 H NMR spectroscopy, mass spectrometry, and X-ray diffraction.

New heterocyclic compounds with phenyl chromium tricarbonyl substituents were synthesized by the reaction of triammine(tricarbonyl)chromium with phenyl-substituted 1,3-oxazacy-cloalkanes bearing acetyl, tert -butyloxycarbonyl, or phenyl group at the nitrogen atom. The resulting compounds were isolated in the individual state and characterized by physicochemical methods of analysis.

The condensation reactions of β- and γ-amino alcohols containing phenyl or (η6-arene) tricarbonylchromium substituent with formaldehyde, acetaldehyde, benzaldehyde, and (η6-benzaldehyde)tricarbonylchromium were studied. The resulting 1,3-oxazolidine and 1,3-oxazinane products were isolated in a pure form and identified by different physicochemical methods. The effect of (η6-arene)tricarbonylchromium moiety on the reaction process was demonstrated.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

The effect of temperature on the cracking of pond acid tar and acid tar neutralized with lime has been studied. The formation of H2S or SO2 is determined by the amount of sulfuric acid in the tar. Liquid hydrocarbons obtained from neutralized acid tar are characterized by low sulfur content.

The reactions of 1,3-dipolar cycloaddition of π-complexes of nitrones of a general formula R2CH=N(O)R1, where R1 = Me, But, Ph, R2 = Ph[Cr(CO)3], C5H4[Mn(CO)3] with (η6-styrene)-tricarbonylchromium and vinyl-(η5-cyclopentadienyl)tricarbonylmanganese have been investigated. These reactions led to the formation of corresponding isoxazolidines with high regio- and diastereoselectivity. The obtained metal-containing isoxazolidines were identified using UV, IR, 1H NMR spectroscopy, mass-spectrometry, and X-ray diffraction analysis.

A new method of microchannel formation in silicone rubber cured by heat in the presence of a platinum catalyst was developed using whiskers of p-aminobenzoic acid. Four types of whiskers with lateral dimensions of 10–20, 50–70, 200–300, and 500–600 µm and lengths of 2–3, 5–10, 10–20, and 20–30 mm, respectively, were grown from hot aqueous solutions. A new method for the manufacture of elastic siloxane rubber samples penetrated by open channels with the size corresponding to the size of whiskers is presented. The materials were studied by optical and atomic force microscopy, powder X-ray diffraction, differential scanning calorimetry, gas chromatography—mass spectrometry, and porosimetry.

The mass spectra of the antimony(v) o -amidophenolate complexes were obtained by electron ionization mass spectrometry. The most intense peak in the spectra of the most compounds is [M–SbR 3 –Alk] + . At the same time, the molecular ion peak for all compounds, except the complexes with alkyl substituents at the antimony atom, is characterized by low intensity.

Методами ЯМР 1, ЯМР 13 и двумерной ЯМР-спектроскопии определены состав и строение образцов поливинилбутиральфурфураля, полученных на разных стадиях ацеталирования поливинилового спирта. С использованием одномерной и двумерной диффузионной ЯМР-спектроскопии установлено строение низкомолекулярных и олигомерных примесей, которые могут образоваться в процессе синтеза сополимера или при его растворении в спирте.

We have studied the effect of substituent R on the rate and mechanism of thermal decomposition of copper(II) complexes with L-α-amino acids anions H 2 NCH(R)COO − . The homolytic decomposition rate increases in the series of CuL 2 complexes with alanine, glycine, valine, isoleucine, leucine, phenylalanine, and serine. Intramolecular redox formation of ·+ CuGly cation-radical upon reduction of Cu(II) to Cu(I) and oxidation of H 2 NCH 2 COO − into H 2 NCH 2 COO · carboxylamine radical is the primary stage of heat-induced decomposition.

With the use of 1H NMR, 13C NMR and two-dimensional NMR spectroscopy, the composition and structure of polyvinyl butyral furfural samples obtained at different stages of poly(vinyl alcohol) acetalization have been determined. The structure of low-molecular-mass and oligomer admixtures that may be formed in the course of synthesis of the copolymer or during its dissolution in alcohol has been estimated via one-dimensional and two-dimensional diffusion NMR spectroscopy.

Thermal decomposition of L-α-amino acids RCH2(NH2)COOH where R = Me2CH, Me2CHCH2, MeEtCH, and C6H5CH2 was studied at temperatures below the melting points of their crystals. From the effective rate constants of the first order reactions energy parameters in the Arrhenius equation were calculated. Correlations between the reaction rate constants k R and the inductive constants σ* of substituents R and also between the rate constants of the reactions and the dipole moments of amino acids was established. Value of ρ* parameter +8.8 in the Taft equation indicates the heterolytic mechanism of transformation of the amino acids. Chromato-mass spectrometric analysis of decomposition products shows that condensation, decarboxylation, and deamination of the amino acids take place.

A new class of Sc, Eu, and Tb complexes with N,O-chelate ligands was synthesized for the first time. The mass spectra, thermogravimetric analysis, differential scanning calorimetry data, as well as the data on the saturated vapor pressure of the compounds were obtained. The main thermochemical parameters of the compounds were calculated.

The behavior of asymmetric dimethylhydrazine was studied in helium and air-helium media with and without passage of electric current through the discharge unit of the reactor. The products of the corresponding transformations of asymmetric dimethylhydrazine were identified by the gas chromatography/mass-spectrometry technique.

Reactions of neodymium and dysprosium diiodide hydrides LnI2H with lithium naphthalenide in THF furnished heterobimetallic naphthalene hydride clusters (C10H8)3Ln5Li5H14 (Ln = Nd, Dy). Treatment of the latter with hexamethyldisilazane in THF leads to the removal of lithium in the form of LiN(SiMe3)2 and the formation of compounds of the composition (C10H8)3Ln5H9 (Ln = Nd, Dy). All the clusters obtained were isolated as black pyrophoric powders insoluble in THF and other organic solvents. Reactions of (C10H8)3Nd5Li5H14 and (C10H8)3Nd5H9 with cyclopentadiene lead to Cp3Nd(THF).

Cycloaddition of η6-(styrene)chromium tricarbonyl to hexa-2,4-diene or cyclopentadiene afford the Diels-Alder adducts with retention of the Cr(CO)3 group, whereas cyclohexa-1,3-diene undergoes aromatization to give η6-(benzene)chromium tricarbonyl. The counter synthesis of these (arene)chromium tricarbonyl derivatives from uncoordinated adducts of the Diels-Alder reaction and chromium hexacarbonyl was carried out.

Studying the reaction of PcSiX 2 (X = Cl, OH) with KOH in DMSO we first discovered red D-A complexes [(Pc 2− )·PcSiX 2 ] and [(Pc 2− )·O 2 ] in which silicon phthalocyanine dianion Pc 2− is a donor, and the parent phthalocyanine silicon or oxygen are acceptors of electron density. The complexes were characterized by electron absorption, NMR, and ESR spectra. In the reactions with Me 3 SiCl, H 2 O, or CH 3 COOH the complexes regenerate phthalocyanine and O 2 . In O 2 atmosphere the [(Pc 2− )·O 2 ] complex gradually degrades affording a product of unknown nature.

The process of decomposition of unsymmetrical dimethylhydrazine in electric discharge in helium and in the mixtures of helium and air has been studied. Reaction products have been identified by chromatography-mass spectrometry. The possibility of using electric discharge for purification of air from unsymmetrical dimethylhidrazine has been demonstrated.