Synthesis of esters of bis(alkoxymethyl) phosphinic acids

Conclusions A method was developed for the production of esters of bis(alkoxymethyl)phosphonic acids, and some of these esters were synthesized.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 710–716, 1969.     

Synthesis of bis(aryloxymethyl)phosphonic acids and their esters

Conclusions Synthetic methods were developed and bis(aryloxymethyl)phosphonic acids and their esters were synthesized.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 951–953, April, 1969.     

Synthesis of methylamides of N-acetyl α-amino acids and their N-methyl derivatives

Conclusions A chromatospectrophotometric method for the quantitative determination of osajin in various organs ofMaclura aurantiaca Nutt. has been proposed. It has been established that the best type of raw material is the fruit of the plant, which contains about 6.4% of osajin.Khimiya Prirodnykh Soedinenii, Vol. 6, No. 3, pp. 304–306, 1970     

Synthesis of polydihydropyridazinones from bis(3-benzoylpropionic acids) and aromatic dihydrazines

A new class of polydihydropyridazinones has been synthesized by the solution cyclopolycondensation in m-cresol of 4,4′-oxy- and 4,4′-ethylenebis(3-benzoylpropionic acids) with aromatic dihydrazines such as bis(4-hydrazinophenyl) sulfone and bis(4-hydrazinophenyl)methane. The polymers having inherent viscosities of 0.2–0.4 were highly soluble in a wide range of solvents including m-cresol, N,N-dimethylacetamide, and pyridine. Thermogravimetric analysis of the polydihydropyridazinones showed initial weight losses commencing at 290–350°C in both air and nitrogen.     

Synthesis of some derivatives of bis (N,N-dialkylaminomethyl)phosphinic acids

Conclusions A number of derivatives of bis(N,N-dialkylaminomethyl)phosphinic acids have been obtained by the reaction of dialkylamines with esters and amides of bis(chloromethyl) phosphinic acid.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1346–1348, June, 1967.     

Synthesis of symmetric bis(imidazole-4,5-dicarboxamides) substituted with amino acids

A series of symmetric bis(imidazole-4,5-dicarboxamides) (bis-I45DCs) were prepared with amino acid esters and a variety of linker groups. The critical pyrazine intermediates, substituted with amino acid esters, were synthesized by stoichiometric control of the amino acid ester, even though primary alkanamines, in comparison, generally offer less selectivity for this reaction. Diamines are added to subsequently react with and open the remaining acyl imidazole bonds in the pyrazine intermediates and thereby yield the bis-I45DCs.     

Synthesis and properties of bis [N-Alkyl(aryl)-aminomethyl]phosphinic acids

Conclusions Reaction of primary aliphatic and aromatic amines with bischloromethylphosphinic acid yielded a series of bis(N-alkyl(aryl)aminomethyl)phosphinic acids and the methacroylamides of several of them were obtained.Translated from Izvestiya Akademii Nauk SSSR, Seriya Kkimicheskaya, No. 8, pp. 1860–1862, August, 1968.     

Synthesis of bis(glycosylamino)alkanes and bis(glycosylamino)arenes

The condensation of D-mannose and D-galactose with aliphatic and aromatic diamines afforded a series of bis(glycosylamino)alkanes and-arenes. A possible mechanism was proposed for the formation of 1,2-bis(β-D-glycosylamino)benzenes. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2793–2801, December, 2005.     

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.     

Synthesis and characterization of bis(cyclopentadienyl)bis(hexafluoroantimonato) titanium(IV)

Reaction of titanocene dichloride with two equivalents of silver hexafluoroantimonate in sulphur dioxide quantitatively yields Cp₂Ti(SbF₆)₂ (Cp = η⁵-C₅H₅) and AgCl. The titanocene bishexafluoroantimonate was recrystallized from SO₂ and characterized by chemical analysis, ¹H NMR, IR and mass spectroscopy.     

Synthesis of bis(sigma-aryl)dirhodium(III) caprolactamates by oxidative arylation with arylboronic acids

Recently discovered stable bis(sigma-phenyl)dirhodium(III) caprolactamate and its substituted derivatives are conveniently prepared in high yields from dirhodium(II) caprolactamate and commercially available arylboronic acids in a copper-catalyzed process.     

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.     

Kinetics and mechanism of formation of tetrachloropalladate(II) in the reactions of bis(oxalato)- and bis(malonato) palladate(II) with chloride in acid media

Summary Kinetics of formation of [PdCl₄]^2– from [Pd(ox)₂]^2– and [Pd(mal)₂]^2– has been studies in aqueous acid media in the presence of an excess of chloride ion by stopped-flow spectrophotometry. Both the complexes undergo the transformation in two well separated consecutive steps. In 0.02–0.05 M acid with 0.2 M Cl^–, Pd(AA)^2– dissociates leading to the formation of [Pd(AA)Cl₂]^2– (where AA =ox^2– or mal^2–), which in 0.1–0.6 M acid and 1 M Cl^– forms [PdCl₄]^2– in a relatively slow step. For both steps k_abs=k₀+k₂[H⁺][Cl^–]. Activation parameters corresponding to k₀ and k₂ have been determined. Results indicate that [Pd(mal)₂]^2– is much more labile to substitution than [Pd(ox)₂]^2– and for both the lability is far greater than that of [Pd(bigH)₂]²⁺ and [Pt(ox)₂]^2– reported earlier.     

Synthesis of N-phosphoryl amino acids using bis(9-fluorenylmethyl)phosphite

Bis(9-fluorenylmethyl)phosphite (BFMP) was found to be an effective reagent for the N-phosphorylation of various amino acid methyl esters. BFMP was prepared from N,N-diisopropyl phosphoramidous dichloride in a one-pot two-step reaction and was obtained as a crystalline solid. N-Phosphorylation of the methyl esters of seven representative amino acids with BFMP was high-yielding and generally resulted in crystalline products. Complete deprotection of both the 9-fluorenylmethylphosphosphate esters and the amino acid methyl esters was accomplished concomitantly with LiOH to give N-phosphoryl amino acids.     

Synthesis and characterization of three co-crystals of bis(benzimidazole) derivatives with aromatic dicarboxylic acids

Research on Chemical Intermediates - Combination of three aromatic carboxylic acids (5-nitroisophthalic acid (H2nip), 2,6-naphthalenedicarboxylic acid (H2ndc), tetrabromoterephthalic acid (H2tbta))...     

Synthesis of bis(pyrimidyl)furoxanes by the oxidation of bis(pyrimidyl)glyoximes

Conclusions This is the first report of the synthesis of a 3,4-bis(pyrimidyl)furoxane by the oxidation of bis (pyrimidyl)glyoxime. The substrate used was 1,2-bis(2,4-diethoxypyrimidin-6-yl) glyoxime.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 915–917, April, 1988.Deceased.     

Synthesis and multitopic complex formation of a photochromic bis(crown ether) based on benzobis(thiazole)

2,7-Bis[2-(6,7,9,10,12,13,15,16-octahydro-5,8,11,14,17-pentaoxabenzocyclopentadecen-2-yl)vinyl]-benzo[1,2-d;3,4-d']bisthiazole, 2, with crown ether styryl moieties substituted on a heterocyclic core, was synthesized and its complex forming ability with several metal cations was evaluated in acetonitrile by absorption and fluorescence spectroscopy. The results are compared to those for the analogous ligand possessing a single crown ether styryl moiety. Selective binding of the metal cation at the heterocyclic core of both ligands was observed only for Hg2+. Alkali and alkaline earth cations bind selectively at the crown ether moieties. Stability constants and pure spectra of defined stoichiometry were determined with the use of HYPERQUAD, a least-squares fitting program, and the results were validated in one case by subjecting the titration spectral matrix to singular value decomposition with self-modeling (SVD-SM). The multitopic ligand 2 forms relatively strong 2:2 stoichiometric complexes with K+, among the alkali metal cations, and Ba2+, among the alkaline earth metal cations, and is a promising selective optical sensor for these ions.