On the Perovskites Ba2LnSbO6 (Ln = Nd,Sm, Eu,Gd, Tb,Dy, Ho,Er, Yb)

Polycrystalline Ba₂LnSbO₆ (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb) are cubic, perovskite-type compounds, space group Fm3m (No. 225), Z = 4, with a values from a = 8.544(2) Å for Ba₂NdSbO₆ to a = 8.368(1) Å for Ba₂YbSbO₆. X-ray diffraction data for all the compounds and the results of magnetic measurements for two of them are given.     

Synthesis,Structure and Bonding,Optical Properties of Ba4MTrQ6 (M=Cu,Ag; Tr=Ga,In; Q=S,Se)

Four new quaternary chalcogenides, Ba₄AgGaS₆ ( 1 ), Ba₄AgGaSe₆ ( 2 ), Ba₄CuInS₆ ( 3 ), and Ba₄AgInS₆ ( 4 ), were synthesized by solid‐state reactions and their structures were characterized through single‐crystal X‐ray diffraction. In spite of their similar chemical compositions, the flexible arrangement between the transition metals and the triel atoms leads to subtle differences in their polyanion structures. All structures feature similar [MTrQ₆]^8? 1D polyanionic chains (M=Cu, Ag; Tr=Ga, In; Q=S, Se), which are constructed from corner‐sharing MQ₄ or TrQ₄ tetrahedra. However, the transition metals and triels are mixed in 1 , 2 , and 3 , but they occupy independent crystallographic sites in 4 . As a result, compounds 1 – 3 belong to the known Ba₂CoS₃ (Pnma No. 62) or Ba₂MnS₃ (Pnma No. 62) class, whereas 4 crystallizes in its own structural type within the monoclinic P2₁/c (No. 14) space group. The structural relationship among these new phases was also studied with the aid of DFT calculations and related optical properties are presented as well.     

Reactions ofN,N-dibromo-tert-butylamine with ketoximes

Reactions of acetone, cyclohexanone, and adamantanone oximes withN,N-dibromo-tert-butylamine result in the correspondingC-bromo-diazene-N-oxides. In the case of benzophenone oxime,O, O'-(diphenylmethylene)-bis-benzophenone oxime has been obtained.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 176–177, January, 1994.     

Structural,vibrational, and energy characteristics of halide molecules of group II–V elements

Correlations between the internuclear distances r(M-X), the bond energies E(M-X), and the valence force constants f_r for di- and trihalides of Group II–V elements are established. Some missing values are estimated. Ivanovo State Chemical Technological Academy. Translated fromZhurnal Strukturnoi Khimii, Vol. 37, No. 5, pp. 859–875, September–October, 1996. Translated by L. Smolina Ivanovo State Chemical Technological Academy. Translated fromZhurnal Strukturnoi Khimii, Vol. 37, No. 5, pp. 859–875, September–October, 1996.     

The easy hydrolysis of hexacyanocyclopropane, ethyl 1,2,2,3,3-pentacyanocyclopropane-1-carboxylate, 1,2,2,3,3-pentacyanocyclopropane-1-carboxamide, andN,N-dimethyl-1,2,2,3,3-pentacyanocyclopropane-1-carboxamide tor-1,c-2,c-3-tricyanocyclopropane-t-carboxamide

Hydrolysis of hexacyanocyclopropane (1a), ethyl 1,2,2,3,3-pentacyanocyclopropane-1-carboxylate (1b), 1,2,2,3,3-pentacyanocylopropane-1-carboxamide (1c), andN,N-dimethyl-1,2,2,3,3-pentacyanocylopropane-1-carboxamide (1d) in 95% acetic acid yieldsr-1,c-2,c-3-tricyanocyclopropane-t-1-carboxamide (3). The structure of3 was proved by X-ray diffraction analysis. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 454–456, March, 1998.     

Chelate synthesis of pyrazolyl(ethoxycarbonyl)ketene aminals,the precursors of functionalized pyrazolo[1,5-c]pyrimidines

A scheme for the preparation of novel synthetic reagents. pyrazolyl(ethoxycarbonyl)ketene aminals, from acetyl(ethoxycarbonyl)ketene (N-benzoyl)aminalvia its difluoroboron chelate is suggested. The possibility of cyclization of the ketene aminals obtained into functionally substituted pyrazolo[1,5-c]pyrimidines is shown.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2211–2214, December, 1994.This work was carried out with the support of the International Science Foundation (ISF, Grant No. M5Q 000), and a part of the work was supported by the Russian Foundation for Basic Research (Project No. 94-03-08964).     

Synthesis of 3S-methylundec-1-ylbromide, a key synthon in the synthesis of (S,S,S)-diprionylacetate, from L-(-)-menthol

Three new approaches to the synthesis of 1-bromo-3S-methylundecane, a key synthon in the synthesis of (S,S,S)-diprionylacetate, a sex pheromone of pine sawflies of the genera Diprion and Neodiprion, were proposed based on chemo-and stereoselective transformations of L-(-)-menthol derivatives. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 73–76, January–February, 2006.     

Synthesis of o-carborane-C-carboxylates of certain natural terpene alcohols, sterols, phenols, and camphar oxime

Previously unreported esters 1b–20b were synthesized from natural terpene alcohols, sterols, plant phenols, and camphar oxime (1a–20a) by reaction with o-carborane-C-carboxylic acid chloride. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 434–436, September–October, 2006.     

Synthesis ofN-(imidomethyl)glycine esters from alkyl glycinates,imides of dicarboxylic acids,and formaldehyde

A method for preparingN-(imidomethyl)glycine esters by the reaction of alkyl glycinates with formaldehyde and imides has been developed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1306–1307, July, 1995.     

Synthesis of isocryptolepine,an alkaloid fromCryptolepis sanguinolenta

Isocryptolepine, an alkaloid recently isolated from the roots ofCryptolepis sanguinotenta, was synthesized by selective methylation at the N(5) atom of 11H-indolo(3,2-c]quinoline with excess Mel in toluene.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp.2795–2796, November,1996     

Ethyl 3,3-diamino-2-(2-p-tolylpyrimidin-4-yl)acrylate,a new representative of hetarylketene aminals

A new representative of hetarylketene aminals, ethyl 3,3-diamino-2-(2-p-tolylpyrimidin-4-yl)acrylate, was synthesized by the reaction ofp-toluamidine with the condensation product of dimethylformamide dimethyl acetal and the difluoroboron chelate of acetyl(ethoxycarbonyl)ketene (N-benzoyl)aminal. This synthesis is an example of pyrimidine ring assembly using the methodology based on transformations of chelate complexes.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1638–1640, September, 1994.This research was partially supported by the International Science Foundation (Grant No. M5QOOO).     

Synthesis,properties, and structures of 5-nitroalkyl-5H-(1,2,3)triazolo[4,5-c]furazans

Methods for the synthesis of the first representatives of 5-nitroalkyl-5H-(1,2,3)triazolo[4,5c]furazans have been developed, and some of their properties have been studied.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1315–1317, July, 1995.     

Triterpene glycosides from Cussonia paniculata. III. Structure of glycosides I1, I2, J1a, J1b, J2, K, L1, and L2 from C. paniculata leaves

Structures of eight triterpene glycosides, of which the 28-O-(2-O-acetyl-and 3-O-acetyl-α-L-rhamnopyranosyl)-(1→4)-O-β-D-glucopyranosyl-(1→ 6)-O-β-D-glucopyranosyl esters of hederagenin 3-O-β-D-glucopyranosyl-(1→ 2)-O-α-L-arabinopyranoside (J_1a and J_1b) were new, from Cussonia paniculata (Araliaceae) leaves were established using chemical and NMR spectroscopic methods. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 149–152, March–April, 2006.     

Assembly, crystal structure, and luminescent properties of three-dimensional (10,3)-a netted rare earth coordination polymers

Solid complexes [REL(NO3)3]n with novel (10,3)-a type three-dimensional networks structure have been assembled using rare earth nitrates and an amide type semirigid tripodal bridging ligand, 1,3,5-tris {[(2′-benzylaminoformyl)phenoxyl]methyl}benzene (L), as building blocks. The complexes were crys- tallized in the orthorhombic system with chiral space group P212121. The whole structure consists of an infinite array of trigonal RE(III) ions bridged by tridentate ligands, and a novel (10,3)-a net is formed, which is very uncommon in the rare earth complexes. At room temperature, the Sm(III), Eu(III), Tb(III), Dy(III) complexes all exhibited characteristic luminescence emissions of central metal ions under UV light excitation.     

Novel liquid crystal compounds,derivatives of 2-pyrone

6-(4-n-Hexyloxyphenyl)- and 6-(4-n-decyloxyphenyl)-2-pyrones, which possess smectic and nematic mesomorphism, were synthesized.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1793–1794, October, 1994.     

A new synthesis of (Z,E)-tetradec-11-enyl acetate,the sex attractant of the omnivorous leafroller (Archips podana)

A four-step synthesis of the title pheromone was elaborated starting from accessible (Z)-cyclooctene and but- 1-ene.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 2127–2128, August, 1996.     

Synthesis and Characterization of [Br3][MF6] (M=Sb,Ir), as well as Quantum Chemical Study of [Br3]+ Structure,Chemical Bonding,and Relativistic Effects Compared with [XBr2]+ (X=Br,I, At,Ts) and [TsZ2]+ (Z=F,Cl, Br,I, At,Ts)

[Br₃][SbF₆] and [Br₃][IrF₆] were synthesized by interaction of BrF₃ with Sb₂O₃ or iridium metal, respectively. The former compound crystallizes in the orthorhombic space group Pbcn (No. 60) with a=11.9269(7), b=11.5370(7), c=12.0640(6) Å, V=1660.01(16) ų, Z=8 at 100 K. The latter compound crystallizes in the triclinic space group P (No. 2) with a=5.4686(5), b=7.6861(8), c=9.9830(9) Å, α=85.320(8), β=82.060(7), γ=78.466(7)°, V=406.56(7) ų, Z=2 at 100 K. Both compounds contain the cation [Br₃]⁺, which has a bent structure and is coordinated by octahedron-like anions [MF₆]⁻ (M=Sb, Ir). Experimentally obtained cell parameters, bond lengths, and angles are confirmed by solid-state DFT calculations, which differ from the experimental values by less than 2 %. Relativistic effects on the structure of the tribromonium(1+) cation are studied computationally and found to be small. For the heaviest analogues containing At and Ts, however, pronounced relativistic effects are found, which lead to a linear structure of the polyhalogen cation.     

Synthesis,alkylation, and molecular and crystal structure ofN-methylmorpholinium 6-amino-3,5-dicyano-1,4-dihydropyridine-4-spirocyclohexane-2-thiolate

The reaction of cyano(cyclohexylidene)thioacetamide with cyanothioacetamide or malononitrile andN-methylmorpholine yieldsN-methylmorpholinium 6-amino-3,5-dicyano-1,4-dihydropyridine-4-spirocyclohexane-2-thiolate. Its structure was established based on the results of alkylation and X-ray structural analysis.Deceased.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2535–2540, October, 1996.     

Reaction ofN,N-bis(chloromethyl)amides withN,N′-diacylated alkene(arylene)diamines

Reactions ofN,N-bis(chloromethyl)amides withN,N′-diacyl derivatives of ethylenediamine (oro-phenylenediamine) result in formation of the corresponding 1,3,5-triacylated perhydro-1,3,5-triazepines (or their benzoanalogs) or 1,3-diacylated imidazolidines (or their benzoanalogs). Reactions ofN,N-bis(chloromethyl)amides withN,N′-ditosylated trimethylenediamine occur in a similar way. The direction of the reactions depends on the type of the acyl substituents and the strength of the bases. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2270–2273, November, 1998.     

The structures of ferocaulin,ferocaulinin, ferocaulidin,and ferocaulicin

Summary From the roots ofFerula conocaula Korov. four new terpenoid coumarins have been isolated: ferocaulin (I), ferocaulinin (II), ferocaulidin (III), and ferocaulicin (IV).On the basis of chemical reactions and spectral characteristics, and also conversion into conferdione, the structures and relative configurations (Ia-IVa) have been established for them.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 322–327, May–June, 1978.