Synthesis and characterization of sodium bis(trimethylstannyl) amide and bis(trimethylsilyl) bis(trimethylstannyl) -phospha-tetrazene

Sodium bis(trimethylstannyl)amide NaN(SnMe₃)₂, isolated by the reaction of trimethylstannyldiethylamine with sodium amide, reacts with tris(trimethylsilyl)hydrazino—dichloro-phosphine to form bis(trimethylsilyl)bis(trimethylstannyl)-2-phospha-2-tetrazene, (Me₃Si)₂N-N=P-N(SnMe₃)₂. Both the molecules have been isolated and characterized.     

Methylene bis(aluminum dihalides)

Methylene bis(aluminum dichloride) and methylene bis(aluminum dibromide) have been synthesized in essentially quantitative yields. It is postulated that the reaction sequence which leads to these compounds requires aluminum monohalide as a transitory intermediate.     

Synthesis and properties of bis(vinylenedithio)- and bis(dimethylvinylenedithio)tetrathiafulvalenes

A method was developed for the preparation of bis(vinylenedithio)- and bis(dimethylvinylenedithio)tetrathiafulvalenes from 1,3-dithiole-2-thione-4,5-dithiolate.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1470–1473, November, 1986.     

Molecular structure and bonding properties of bis(1-methylimidazole)bis(perchlorato)bis(pyridineN-oxide)copper(II)

Summary The crystal and molecular structure of bis(1-methylimidazole)bis(perchlorato)bis(pyridineN-oxide)copper(II) have been determined using three-dimensional x-ray diffraction data. The complex crystallizes in space group P2₁/c with Z=2. The cell dimensions area=9.355(3),b=14.363(4),c=9.698(4) Å, and =106.40(3)^o. Least-squares refinement of the structure has yielded a final R value of 0.049 for 1235 independent reflections. The centrosymmetric structure consists oftrans pairs of 1-methylimidazole and pyridineN-oxide figands forming a square planar geometry with Cu–N and Cu–O bond lengths of 1.963(4) Å and 1.948(4) Å, respectively. The two perchlorate ions are located above and below the square plane with Cu–O distances of 2.590(5) Å. The uv-vis and i.r. spectra and bonding properties of the title compound are discussed with reference to the structure.     

Synthesis of novel bis(chromenes) and bis(chromeno[3,4-C]pyridine) incorporating piperazine moiety

Novel bis(2-oxo-2H-chromene) as well as bis(2-imino-2H-chromene) derivatives incorporating piperazine moiety were prepared by the cyclocondensation reaction of bis(2-hydroxybenzaldehyde) with two equivalents of each of the appropriate β-ketoesters or acetonitrile derivatives. The bis(2-imino-2H-chromene-3-carbothioamide) derivative was used as a key synthon for construction of novel bis(3-(4-substituted thiazol-2-yl)-2H-chromen-2-one) derivatives via its cyclocondensation with a series of the appropriate α-halocarbonyl derivatives. Moreover, the bis(2-hydroxybenzaldehyde) reacted with four equivalents of the appropriate acetonitrile derivatives to afford the corresponding bis(3H-chromeno[3,4-c]pyridine) derivatives. Elucidation of the structure of the novel bis(chromenes) bearing piperazine nucleus was established by the spectral data and elemental analyses.     

Bis(tetramethylammonium), bis(tetrabutylammonium), and bis(tetraphenylarsonium) dihydrohexaoxoxenonates(VIII)

Bis(tetramethylammonium), bis(tetrabutylammonium), and bis(tetraphenylarsonium) dihydrohexaoxoxenonates(VIII) were obtained in an aqueous solution and in acetonitriie. The rate constants of their decomposition were determined.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 184–185, January, 1995.This work was carried out with financial support from the International Scientific Foundation (Grant REI 000).     

Preparation and characterization of bis(acetonitrile)bis(acetylacetonato)technetium(III)

A new chemical species of bis(acetonitrile)bis(acetylacetonato)technetium(III), [Tc(acac)₂(CH₃CN)₂]⁺, has been prepared by the reaction of tris(acetylacetonato)technetium(III) with acetonitrile in the presence of a strong acid, perchloric or hydrochloric acid. The reaction kinetics were followed by observing spectral change of Tc(acac)₃ in the UV-visible region. The complex has been characterized by combination of elemental analyses, IR and UV-visible spectrophotometry, ion-exchange chromatography, and paper electrophoresis. Applicability of this substance to synthesize mixed-ligand technetium(III) complexes was discussed based on the solubility of this complex and the ease of substitution of the acetonitrile ligand.     

35Cl NQR spectra of bis(chlorobenzene)chromium(0) and bis(chlorobenzene) chromium(I) iodide

Conclusion A study was carried out on the³⁵Cl NQR spectra of bis(chlorobenzene)chromium(O) and bis(chlorobenzene)chromium(I) iodide. The coordination of chlorobenzene with the charged ClC₆H₆Cr⁺ fragment leads to a sharp decrease in electron density. This effect is significantly greater than that resulting from the coordination of chlorobenzene with the ClC₆H₅Cr group in neutral bis(chlorobenzene)chromium.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2801–2803, December, 1986.     

Aliphatic polyimides from phenylene bis(succinic anhydride) and bis(glutaric anhydride)

Meta and para derivatives of phenylene bis(succinic anhydride) and bis(glutaric anhydride) were obtained from 1,3- and 1,4-bis(β-cyano-β-carbethoxyvinyl)benzene with potassium cyanide or Meldrum acid followed by hydrolysis with concentrated hydrochloric acid and dehydration with acetic anhydride. Aliphatic polyimides were prepared from these anhydrides with six aromatic diamines through thermal ring closure of polyamic acids obtained by solution polymerization in dimethylacetamide, and thermal stability of these polyimides was examined by thermogravimetric analysis.     

New dibenzofuran-bridged bis(amidoamine) and bis(ethylenediamine) ligands and their dinuclear zinc and aluminium complexes

A new class of dibenzofuran-bridged bis(amidoamine) and bis(ethylenediamine) ligands are used to prepare structurally-characterized dinuclear zinc and aluminium complexes.     

Oxidation of bis(4-toluenesulphonyl-L-serinato)copper(II) to bis(formylglycine)copper(II)

Summary Oxidation of L-serine occurs on degradation of bis(L-serinato)copper(II) and at the same time copper is reduced.     

Derivatives of bis (pentafluoroethyl) arsinous acid

Conclusions Replacement of the fluorine in bis (pentafluoroethyl)fluoroarsine gave a number of bis (pentafluoroethyl)arsinous acid derivatives and bis(pentafluoroethyl)phenylarsine.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 121–122, January, 1973.     

Synthesis of bis(3,3-dinitrobutyl)polysiloxanes

Phenyl groups were used as silicon-protecting groups in the synthesis of bis-(3,3-dinitrobutyl)polysiloxanes. The addition of diphenylsilane to acrolein dimethyl acetal, followed by reactions with methyllithium and phosphorus tribromide gave bis(3-bromobutyl)diphenylsilane. Sodium nitrite displacement gave bis(3-nitrobutyl)diphenylsilane, and oxidative nitration gave bis(3,3-dinitrobutyl)diphenylsilane. Dephenylation with bromine and hydrolysis gave cyclic polysiloxanes.     

Crystal structure and in vitro antitumor activity of bis(dicyclohexylammonium) bis(2-sulfobenzoato)dibutylstannate

An X-ray structure determination is presented for bis(dicyclohexylammonium) bis(2-sulfobenzato)dibutylstannate, and its antitumor properties against mammary and colon carcinoma cell lines are reported.     

One-step assembly of a chiral palladium bis(acyclic diaminocarbene) complex and its unexpected oxidation to a bis(amidine) complex

Addition of trans-N,N'-dimethyl-1,2-diaminocyclohexane to a palladium bis(arylisocyanide) complex leads to the one-step formation of the first chiral bis(acyclic diaminocarbene) complex, which is thermally stable under N(2) but undergoes slow oxidation to a bis(amidine) complex under air.     

Simple non-empirical calculations of the zero-field splitting in bis(aquo) bis(malonato) nickel(II)

Summary A simple non-empirical method is applied to calculate the splittings of the ground state triplet, caused by the spin-orbit coupling, in bis(aquo) bis(malonato) nickel(II), allowing for a certain geometry variation. The calculations yield splittings on the order of 10–20 cm^–1. The comparison of exact (within model) and second-order perturbation theory calculations indicate that the spin Hamiltonian formalism is valid. The implications of the results for the theory of nuclear spin relaxation in paramagnetic complexes in solution are discussed.     

N-Fluorination of bis(polynitroalkyl)amines

Conclusions The fluorination of bis(polynitroalkyl)amines by elemental fluorine in acetic acid gave a series of bis(polynitroalkyl)-N-fluoramines.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2859–2860, December, 1987.     

Bis(1,2-cyclopentylenedithio)- and bis(1,2-cyclohexylenedithio)tetrathiafulvalenes

New homologs of bis(ethylenedithio)tetrathiafulvalene, viz., bis(cyclopentylenedithio)tetrathiafulvalene and bis(cyclohexylenedithio)tetrathiafulvalene, were obtained via a known scheme and characterized.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1317–1319, October, 1991.     

Bis(disilanyl)- and bis(trisilanyl)carbodiimides

Conclusions The reaction of chlorodi- and trisilanes with silver cyanamide gave bis(disilanyl)carbodiimides and bis(trisilanyl)carbodiimides in high yield.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2824–2825, December, 1985.