Synthesis and molecular structure of a substituted 8-oxa-10-azatricyclo [7.3.1.0]tridecatetraene

10,11-Dimethyl-9-(coumarin-3 -yl)-12-ethoxycarbonyl-8-oxa-10-azatricyclo[7,3,1.0^2.7]trideca-2,4,6-11-tetraene was isolated from the mixture of products from the condensation of salicyl aldehyde with acetoacetic ester and methylamine. Its molecular structure has been established by x-ray crystallography.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 259–264, February, 1996.     

One-Pot Synthesis of 6,7-Dehydro-1-aza-3-oxabicyclo[3.3.1]nonanes by Condensation of α-Methylstyrenes with Formaldehyde and Ammonia

Russian Journal of Organic Chemistry -     

Synthesis and molecular structure of substituted 2-hydroxyperhydro-[1,3,2]dioxaborinino[5,4-<Emphasis Type="Italic">c</Emphasis>]pyridines,perhydro[1,3]dioxano[5,4-<Emphasis Type="Italic">c</Emphasis>]pyridine,and their precursor-4-hydroxy-3-(α-hydroxybenzyl)-1-methyl-4-phenylpiperidine

4,8a-Diphenyl-substituted 2-(2-propoxy)perhydro[1,3,2]dioxaborinino[5.4-c]pyridine was obtained by the condensation of 4-hydroxy-3-(α-hydroxybenzyl)-1-methyl-4-phenylpiperidine with triisopropyl borate, and its 2-hydroxysubstituted analog in the presence of water. 1-Methyl-4,8a-diphenyl-perhidro[1,3]dioxano[5,4-c]pyridine was synthesized by the reaction of the same piperidol with formaldehyde. A comparative study of the molecular structures of the three products was carried out by X-ray crystallography. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, 1726–1735, November, 2008.     

Electrochemical Behavior of Sulfur in Aqueous Alkaline Solutions

Russian Journal of Physical Chemistry A - The kinetics and mechanism of the electrode oxidation-reduction of sulfur on an electrically conductive sulfur–graphite electrode in an alkaline...     

Electrical conductivity of solutions of copper(II) nitrate crystalohydrate in dimethyl sulfoxide

Conductometry is used to investigate the electric conductivity of Cu(NO₃)₂ ? 3Н₂О solutions in dimethyl sulfoxide in the 0.01–2.82 M range of concentrations and at temperatures of 288–318 K. The limiting molar conductivity of the electrolyte and the mobility of Cu²⁺ and NO₃^- ions, the effective coefficients of diffusion of copper(II) ions and nitrate ions, and the degree and constant of electrolytic dissociation are calculated for different temperatures from the experimental results. It is established that solutions containing 0.1–0.6 M copper nitrate trihydrate in DMSO having low viscosity and high electrical conductivity can be used in electrochemical deposition.     

Synthesis and spectral characteristics of 2-aryl-6-methyl-and 2-aryl-6-benzyl-4,8a-diphenylperhydro[1,3,2]dioxaborinino[5,4-c]pyridines

Aryl-N-methyl-and aryl-N-benzyl-B-substituted 4,8a-diphenylperhydro[1,3,2]dioxaborinino[5,4-c]pyridines, which are representatives of a new class of bicyclic compounds containing four heteroatoms, were synthesized from N-methyl-and N-benzyl-3-(α-hydroxybenzyl)-4-phenyl-γ-piperidols by cyclocondensation with arylboronic acids. The ¹H NMR and mass spectra of these compounds were examined as well as mass spectra of previously obtained analogs. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1253–1259, August, 2008.     

Synthesis of pyrrolidines and tetrahydro-1H-azepines from 4-aryl-1-benzoyl(ethoxycarbonyl)methyl-1-methyl-1,2,3,6-tetrahydropyridinium halides

4-Aryl-1,2,3,6-tetrahydropyridinium quaternary salts which have a benzoylmethyl or ethoxycarbonylmethyl group on atom N-1 generate N-ylides when heated in the presence of NaH and they can rearrange in situ with contraction or expansion of the six-membered heterocycle to give substituted pyrrolidines (as a result of a [2,3]-sigmatropic rearrangement) or 1H-tetrahydroazepine derivatives (via Stevens rearrangement). The presence of an aryl substituent at position C-4 in the tetrahydropyridine ring allows to avoid the formation of elimination products and changes the direction of the reaction towards the preparation of the tetrahydroazepines. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1670–1676, November, 2007.     

The solvent influence on some physicochemical properties of Cu(NO3)2·3H2O-(CH3)2SO solutions

The electrical conductance of Cu(NO₃)₂·3H₂O solutions (0.00886–2.82 mol L^?1) in dimethylsulfoxide at 288–318 K has been studied by conductometry.