Interaction of 1-vinylpyrazoles with alkanethiols

It was found that vinylpyrazoles react with thiols both according to ionic and according to free-radical mechanisms, with the formation of products of - and -addition. Radical thiylation of 1-vinylpyrazoles is a convenient method of synthesis of pyrazoles with sulfur-containing substituents.Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, 664033 Irkutsk. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 8, pp. 1874–1878, August, 1992.     

Synthesis and crystal structural study of ternary molybdate NaMg3In(MoO4)5

We have synthesized single crystals of a temary molybdate NaMg₃In(MoO₄)₅ and cam'ed out an X-ray structural study (a KM-4 automatic difiactometer, MoK, radiation, 4503 F, R = 0.047). The triclinic unit cell dimensions are a = 7.0476(7), b = 17.935(2), c = 6.9849(7)Å, = 87.650(9), = 100.980(8), = 92.510(9)°, V= 865.5(2) A³, Z = 2, and space group P^–1. The crystal structure involves MoO₄ tetrahedra and (Mg, In)0₆ octahedra forming a three-dimensional framework with Na atoms located in its cavities. The compound melts at 990°C with decomposition.Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Institute of Physics, Siberian Branch, Russian Academy of Sciences. Buryatian Institute of Natural Sciences, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 5, pp. 147–151, September–October, 1993.Translated by T. Yudanova     

Crystal and molecular structure of the sesquiterpene lactone mucrin

An x-ray structural investigation has been made of the sesquiterpene lactone mucrin, diffractometer: Cu K radiation, 942 reflections, direct method, R factor 0.083. The spatial structure of the molecule has been determined: the lactone ring is trans-linked with the germacrane ring, the epoxide group in the 1,10 position has the 1,10-orientation, and the hydroxy group in position 6 has the -orientation.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Institute of Bioorganic Chemistry, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 59–63, January–February, 1988.     

Crystal structural study of ternary molybdate LiRbBi2(MoO4)4

Single crystals of the title compound have been synthesized and its crystal structure has been determined. The compound crystallizes in the monoclinic system, space group C2/c, Z = 2 (a = 5.3056, b = 12.976, c = 19.578 Å, = 92.583°, R = 0.029). A distinctive feature of the structure is lacy layers of eight-vertex Bi polyhedra and Mo tetrahedra connected to them via common vertices. me adjacent layen are linked together by ten-vertex Rb polyhedra and Li octahedra.Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Buryatian Institute of Natural Sciences, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 5, pp. 152–156, September–October, 1993.Translated by T. Yudanova     

Preparation and reactivity of metal-containing monomers. 21. Spontaneous polymerization of acrylamide coordinated to metal nitrates

Acrylamide coordinated to Cr(III), Bi(III), Pb(II), and Ca(II) nitrates polymerizes spontaneously in concentrated aqueous solutions at 20°C with formation of glass-like polymers containing water. The process takes from several hours to several days, depending on reaction conditions and the nature of the metal nitrate. The product contains water-soluble and water-insoluble fractions. The insoluble fraction is polyacrylamide containing no metal compound. The possibility of spontaneous copolymerization of acrylamide complexes of metal nitrates with other water-soluble monomers was established.Institute of Energy Problems in Chemical Physics, Chernogolovka Branch, Russian Academy of Sciences, 142432 Chernogolovka. Institute of Chemical Physics, Chernogolovka Branch, Russian Academy of Sciences, 142432 Chernogolovka. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 9, pp. 2073–2080, September, 1992.     

Stereocontrolled synthesis of low-molecular-weight β-O-glycosides from products of decyclization of acylated oligosaccharide glycals

Low-molecular-weight -O-glycosides with aliphatic polyfunctional aglycones were synthesized by Horner-Emmons olefination of O-glycosylated ,-unsaturated aldehydes prepared by acid opening of the dihydropyran ring in totally acylated lactal, cellobial, and gentiobial.Institute of Organic Chemistry, Ural Branch, Russian Academy of Sciences, 450054 Ufa. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 5, pp. 1176–1181, May, 1992.     

Bond nature and structure of ferrocyanide-containing materials based on cellulose

The structure and the qualitative composition of ferrocyanide sorbents on cellulose supports have been investigated. It has been shown that the inorganic component is retained on the support by the reaction of the active hydroxides of the cellulose with the CN groups of the ferrocyanide.Institute of Chemistry, Ural Branch, Russian Academy of Sciences, Ekaterinburg 620169. Kristall Scientific and Production Association (NPO), Ekaterinburg 620219. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 3, pp. 565–567, March, 1992.     

Exchange parameters of five-spin clusters of Cu(II) coordination compounds with imidazoline nitroxide radicals

The exchange Heisenberg interaction parameters have been determined from theoretical analysis of the temperature dependence of magnetic susceptibility of coordination cluster compounds [Cu(hfacac)₂]₃(Li⁽ⁱ⁾)₂ (hfacac is hexafluoroacetylacetonate, L⁽ⁱ⁾ are 3-imidazoline nitroxides). Upon coordination of both N O oxygens and heterocycle N(3) atoms by Cu²⁺ ions, the interactions are ferromagnetic in nature and have the same order of magnitude. The minor intercluster interactions are antiferromagnetic.Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences. International Tomography Center. Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 3, pp. 70–74, May–June 1993.Translated by L. Smolina     

New approach to the synthesis of 2,6-difluorobenzoyl isocyanate and its use in the preparation of N-(2,6-difluorobenzoyl)-N′-(polyfluoroaryl)ureas

The treatment of 2,6-difluorobenzoyl chloride with trimethylsilyl isocyanate gave 2,6-difluorobenzoyl isocyanate. This product reacts with polyfluoroaromatic amines to give the corresponding N-(2,6-difluorobenzoyl)-N-(polyfluoroaryl)urea, which hold potential as inhibitors for the biosynthesis of insect chitin.Institute of Chemistry, Bashkir Science Center, Urals Branch, Russian Academy of Sciences, 450054 Ufa. Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 2, pp. 468–470, February, 1992.     

Triterpene glycosides ofAstragalus and their genins LIII. Chemical transformation of cycloartanes III. Modification of ackendoside D

The 17E- and 17Z- isomers of 3-[O--L-arabinopyranosyl-(12)-ß-D-xylophranosyloxy]-6-(-D-xylopy-ranosyloxy)-25-norcycloart-17-en-16-on-24-oic acid have been synthesized in four stages from askendoside D.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (3712) 89 14 75. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 565–567, July–August, 1996. Original article submitted January 15, 1996.     

A sesquiterpene glucoside from cultivated cells of Scorzonera hispanica

A sesquiterpene glucoside has been isolated from a tissue culture ofScorzonera hispanica, and its structure has been established by mass spectrometry and two-dimensional NMR as 6,9-dihydroxy-4,10,14,15-tetradehydroguaian-6,12-olide 9-O--D-glucopyranoside.Irkursk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 640–645, November–December, 1992.     

Influence of valence environment on the O→Si bond in pentacoordinated silicon compounds. 2. Crystal structure of three O→Si trifluorosilanes

We have determined crystal structures of three pentacoordinated silicon compounds: 3-(trifluorosilyl)-2-cyanoethylpropionate (I), N-methyl-N-(trifluorosilylmethyl)acetamide (II), and N-methyl-N-(trifluorosilylmethyl)trifluoroacetamide (III). The coordination OSi bond length is 2.729 and 2.668(5) in I (for two independent molecules), 1.879(1) in II, and 1.942(2) in III. We concluded that mutual orientation of the carboxyl group and the =OSi bond has a strong effect on the length of the latter. In the molecular packing of I, there is a structural motif of rows of close-packed SiF₃ fragments.For communication 1, see [1].A. N. Nesmeyanov Institute of Organoelement Chemistry, Russian Academy of Sciences. Irkutsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 6, pp. 66–73, November–December, 1993.Translated by T. Yudanova     

Biodegradation of aromatic compounds by the yeast-like fungus Trichosporon cutaneum

The biodegradation reactions of veratryl- and guaiacylpropane compounds modeling structural fragments of the lignin macromolecule by the yeast-like fungusTrichosporon cutaneum D-46 have been investigated. It has been shown that the enzyme complex ofT. cutaneum is capable of catalyzing a series of reactions of the biotransformation of arylpropane substrates, namely: oxidation, the cleavage of the C-C bond of the propane chain, demethylation, and decarboxylation. The action of the enzymes was shown most actively in the case of substrates having an unsubstituted phenolic hydroxy group.Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk. Institute of Microbiology, Belorussian Academy of Sciences, Minsk. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 558–564, September–October, 1992.     

Synthesis and structure of new phenyl- and diphenylphosphine derivatives of anabasine and their influence on the activity of mouse liver microsomal cytochrome-P-450-dependent monooxygenases

A series of alkyl N--hydroxypropylanabasinyl and alkyl N-but-2-ynylana-basinyl phenylphosphonates and also N--hydroxypropylanabasinyl and N-but-2-enylanabasinyl diphenylphosphinates possessing considerable antimonooxygenase activity, exceeding that of the standard inhibitor SKF-525A with respect both to an insecticide (paraoxon) and to a medicinal drug (aminopyrine), have been synthesized.A. S. Sadykov Institute of Bioorganic Chemistry, Uzbek Academy of Sciences, Tashkent. I. M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, Leningrad. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 824–828, November–December, 1991.     

Glycosylation of triterpene alcohols of the lupane series

The glycosylation of lupeol, allobetulin, 3-28-dihydroxy-18-lupene, 3-28-dihydroxy-18, 19-epoxylupane and of betulin monoacetates in acetonitrile with mercury cyanide has been studied. The 3- and 28-mono- and the 3,28-di-O--D-glucopyranosides of 3-28-dihydroxy-18-lupene and of 3-28-dihydroxy-18, 19-epoxylupane have been synthesized for the first time. Preparative methods for the synthesis of glucosides of lupeol, of allobetulin, and of betulin 3- and 28-monoacetates are proposed.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, USSR Academy of Sciences, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 212–217, March–April, 1988.     

Soliton mechanism of ion mobility in incommensurate structures

A model of soliton ion mobility in one-dimensional incommensurate structures is considered as the possible mechanism of information transmission in molecular systems. Numerical calculations of the dependence of the diffusion activation energy on the concentration of mobile ions are performed. Experimental NMR data on lithium ion mobility in a model Li_xNbSe₃ (0Zhurnal Strukturnoi Khimii, Vol. 34, No. 6, pp. 135–140, November–December, 1993.Translated by L. Chernomorskaya     

Triterpene glycosides and their genins fromThalictrum foetidum. IV. Structure of cyclofoetigenin B

A glycoside isolated from the epigeal part ofThalictrum foetidum (Ranunculaceae) has yielded a new genin — cyclofoetigenin B — the structure of which has been established on the basis of chemical transformations and spectral characteristics as 24S-cycloartane-3,16,24,25,30-pentaol.Irkutsk Institute of Organic Chemistry of the Siberian Branch of the Academy of Sciences of the USSR. Institute of the Chemistry of Plant Substances of the Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 312–320, May–June, 1986.     

Investigation of the role of the pyrimidine ring in the main chain of polyamido acids and polyimides. 1. Supermolecular structure of polypyromellitimides based on 2,5-bis(p-aminophenyl)pyrimidine and its carbocyclic analog 4,4′-diaminoterphenyl

A detailed comparative study of polypyromellitamido acids and polyimides based on 2,5-bis(paminophenyl)pyrimidine and 4,4-diaminoterphenyl was conducted to determine the role of the nitrogencontaining pyrimidine ring in the main chain of the polymers. A model of the layer packing of polyimide chains in crystalline regions was proposed based on the data from x-ray structural analysis and quantum chemical calculations. The existence of tilted packing caused by partial displacement of the solvent molecules bound to the pyrimidine ring of the neighboring macromolecule with higher basicity in pyrimidine-containing polymers was hypothesized.Institute of Macromolecular Compounds, Russian Academy of Sciences, 199004 Saint Petersburg. Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 10, pp. 2288–2296, October, 1992.