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1.
R. P. Gorshkova V. A. Zubkov V. V. Isakov Yu. S. Ovodov 《Chemistry of Natural Compounds》1981,17(2):113-115
It has been established that an -D-glucan isolated fromYersinia pseudotuberculosis, serotype VI, is branched and contains -14- and -16-bound D-glucopy-ranose residues in the main chain and the side chains, respectively.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostock. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 151–154, March–April, 1981. 相似文献
2.
L. M. Babkov O. V. Gorshkova G. A. Puchkovskaya I. N. Khakimov 《Journal of Structural Chemistry》1998,39(1):44-48
The polymorphism, conformation mobility and structure of 4-cyano-4′-pentalkoxybiphenyl (5OCB) in different physical states
are studied by IR spectroscopy. The spectra were measured in the frequency range 400–4000 cm−1 at temperatures from 300 to 350 K. The IR spectra of 5OCB are modeled using the concept of conformational mobility of these
molecules. An analysis of the experimental and theoretical spectra reveals absorption bands whose spectroscopic parameters
are sensitive to variations of temperature (experiment) and conformation (theory); a relationship between these changes is
established. It is concluded that the polymorphism of 5OCB is of conformation type. In the solid crystalline state, 5OCB molecules
have conformations with a planar biphenyl fragment; the angle of orientation of the plane of the carbon framework of the alkyl
radical relative to the biphenyl fragment decreases as the temperature increases from 35° in the solid crystalline state to
10° in the liquid crystalline and isotropic liquid states. In both of these states the biphenyl fragment becomes nonplanar.
The angle between the phenyl rings is up to 30°.
Saratov State University. Institute of Physics, Ukrainian Academy of Sciences. Samarkand State University. Translated fromZhurnal Strukturnoi Khimii, Vol. 39, No. 1, pp. 55–60, January–February, 1998.
This work was supported by RFFR grant No. 97-03-32175a. 相似文献
3.
Vinogradov M. G. Gorshkova L. S. Chel"tsova G. V. Pavlov V. A. Razmanov I. V. Ferapontov V. A. Malyshev O. R. Heise G. L. 《Russian Chemical Bulletin》2003,52(2):471-479
Prochiral substrates (alkyl aryl ketones, cyclopropyl methyl ketone, 1-indanone, 1-tetralone, ethyl 2-oxo-4-phenylbutyrate, and N-(diphenylphosphinyl)acetophenoneimine) were subjected to asymmetric reduction with aluminum hydride reagents, which were prepared by modifications of NaAlH4 or AlH3 with chiral ,,","-tetraaryl-1,3-dioxolane-4,5-dimethanols (TADDOL). The effects of the nature of the substituents in TADDOL, the structure of the prochiral substrate, and the reaction conditions on the stereochemistry of reduction were investigated. The highest enantioselectivity (70—90% ee) was achieved upon reduction of alkyl aryl ketones and N-(diphenylphosphinyl)acetophenoneimine with NaAl(TADDOLate)H2 in THF or diglyme at a temperature from –70 to –20 °C. The mechanism of asymmetric induction in the reduction reactions of ketones with aluminum hydride reagents is discussed. The stereochemical results of reduction were explained by comparing three-dimensional models of the most probable transition states. 相似文献
4.
The lipopolysaccharides ofYersinia enterocolitica, serovars 0:7.8 (strain 106) and 0:19.8 (strain 842), isolated from the microbial mass by phenol-water extraction, contained residues of L-fucose, 6-deoxy-D-gulose, D-mannose, D-galactose, D-glucose, D- and L-glycero-D-mannoheptoses, N-acetyl-D-glucosamine, N-acetyl-D-galactosamine, and 2-keto-3-deoxyoctonic acid (KDO). The polysaccharides obtained by mild acid hydrolysis of the lipopolysaccharides followed by gel filtration on Sephadex G-50 were a mixture of the O-specific polysaccharide and the core, which could not be separated even by repeated rechromatography because of the comparability of their molecular masses. On the basis of the results of monosaccharide analysis, methylation, Smith degradation, and partial hydrolysis, a structure has been suggested for the repeating unit of the O-specific polysaccharides of the lipopolysaccharides ofY. enterocolitica of the serovars studied.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, USSR Academy of Sciences, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 763–770, November–December, 1989. 相似文献
5.
M. G. Vinogradov L. S. Gorshkova V. A. Ferapontov A. V. Zinenkov 《Russian Chemical Bulletin》1995,44(4):756-758
A selective method for the preparation of 5-chloropentan-2-one by interaction of 1-methylcyclobutanol with Ca(OCl)2 followed by decomposition of the hypochlorite thus obtained in the presence of FeII salt is proposed. The selectivity of the ketone formation from the alcohol is 98%, while the conversion of the alcohol is 35–40%.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 774–776, April, 1995. 相似文献
6.
Lipopolysaccharides have been isolated from two R mutants of the pseudotuberculosis microbeYersinia tuberculosis, serovar VA. Mild acid hydrolysis followed by gel filtration on Sephadex G-25 gave the core oligosaccharides OS I and OS II. Complete acid hydrolysis showed that OS I consisted of residues of D-galactose, G-glucose, two heptoses (D-glycero-D-mannoheptose and L-glycero-D-mannoheptose), and D-glucosamine in a ratio of 1:2.5:4:1, while OS II consisted of residues of D-glucose, heptoses, and D-glucosamine in a ratio of 1:2.5:0.2. On the basis of the results of monosaccharide analysis, methylation, Smith degradation, etc., a partial structure of the core oligosaccharide of the LPS ofY. pseudotuberculosis has been put forward. 相似文献
7.
S. V. Tomshich R. P. Gorshkova Yu. N. El'kin Yu. S. Ovodov 《Chemistry of Natural Compounds》1976,11(5):594-599
Summary Using the chromato-mass spectrometry of the methylated sugars formed in the hydrolysis of the fully methylated lipopolysaccharide fromYersinia pseudotuberculosis of type IB the nature of the glycosidic bonds between the monosaccharide residues has been established. The hapten formed in the partial hydrolysis of the lipopolysaccharide has also been studied by methylation. The results obtained have confirmed the results of an investigation of the methylated lipopolysaccharide; they have enabled an idea to be put forward of the composition of the repeating unit of the O-specific side chains of the lipopolysaccharide.Pacific-Ocean Institute of Bioorganic Chemistry of the Far-Eastern Scientific Center of the Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 563–570, September–October, 1975. 相似文献
8.
N. I. Uvarova R. P. Gorshkova L. I. Strigina G. B. Elyakov N. K. Kochetkov 《Chemistry of Natural Compounds》1966,1(2):63-66
Summary 1. New glycosides — panaxosides C, D, E, and F — have been isolated from the root of ginseng by partition chromatography.2. The glycosides of ginseng contain genins of two groups: the first consists of the genins of panaxosides A, B, and C, and the second of those of panaxosides D, E, and F. When panaxosides D, E, and F are hydrolyzed, panaxadiol is formed as the main product of the decomposition of the genins.Khimiya Prirodnykh Soedinenii, Vol. 1, No. 2, pp. 82–86, 1965 相似文献
9.
L. V. Gorshkova V. P. Zvolinskii N. S. Prostakov A. V. Varlamov M. Torres V. F. Zakharov 《Chemistry of Heterocyclic Compounds》1980,16(12):1245-1248
The diene condensation of 1,3-diphenyl-2-azaanthracene with maleic anhydride proceeds under more severe conditions than the analogous condensation with anthracene. On the basis of an analysis of the PMR data for the adduct obtained it was assumed that isomers of ,-[9,10-dihydro-2-aza-1,3-diphenylanthrylene(9,10)]succinic anhydride with respect to the position of the anhydride bridge relative to the pyridine ring are formed in this condensation. 9,10-Dihydro-2-aza-1,3-diphenyl-9, 10-(1-cyanoethylene)anthracene was obtained in the condensation of the same azaanthracene with acrylonitrile. ,-[5H-8-Aza-7-phenylbenzo[a]fluoranthrylene (5,12b) ]succinic anhydride is formed as a result of the similar condensation of 8-aza-7-phenylbenzo[a]fluoranthene with maleic anhydride, while isomeric (with respect to the position of the nitrile group in the ethylene bridge) 5H-8-aza-7-phenyl-5,12b-(cyanoethylene)benzo[a]fluoranthenes were isolated in its condensation with the acrylonitrile. Data from the PMR and IR spectra were used to prove the structures of the adducts of the diene synthesis obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1645–1647, December, 1980. 相似文献
10.
T. G. Kuznetsova G. K. Boreskov T. V. Andrushkevich Yu. A. Grigorkina N. G. Maksimov I. P. Olenkova L. M. Plyasova T. P. Gorshkova 《Reaction Kinetics and Catalysis Letters》1982,19(3-4):405-409
A solid solution of vanadium in MoO3 with a solubility limit of about 3 mol.% V2O5 is shown to be formed. Its catalytic properties are discussed.
MoO3 3 . % V2O5 .相似文献