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1.
S. D. Mikhano N. S. Kulachkina T. M. Filippova I. G. Suchkova V. M. Berezovskii 《Chemistry of Natural Compounds》1981,17(2):176-178
(±)-Biotin has been synthesized from a mixture of cis- and allo-trisubstituted dehydrothiophanes by a scheme providing for the easy elimination of the accompanying allo-substituted thiophane in the form of an intermediate and not as the final isomeric allo-biotin. The imidazoline ring of biotin is formed from a dialkoxy-carbonyldiaminothiophane under the conditions of partial hydrolysis of one of the protective groups with the elimination of phosgene from the scheme of synthesis.All-Union Scientific-Research Vitamin Institute, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 220–223, March–April, 1981. 相似文献
2.
S. D. Mikhno T. M. Filippova N. S. Kulachkina I. G. Suchkova V. M. Berezovskii 《Chemistry of Heterocyclic Compounds》1976,12(4):386-391
dl-cis- and dl-trans-6-(4-Carboxybutyl)-2-oxo-cis-hexahydrothieno[3,4-d]oxazoles were synthesized by the action of phosgene on r-4-amino-c-3-hydroxy-c(or, respectively, )-2-(4-carboxybutyl)thiophan hydrohalides. It is shown that the acid hydrolysis of r-4-benzamido-t-3-hydroxy-c(or t)-2-(4-methoxycarbonylbutyl)thiophans is accompanied by inversion to give r-4-amino-c-3-hydroxy-c(or t)-2-(4-alkoxycarbonylbutyl)thiophans.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 459–465, April, 1976. 相似文献
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V. V. Korshak V. G. Danilov O. V. Vinogradova M. D. Suchkova 《Russian Chemical Bulletin》1969,18(11):2426-2428
Conclusions The destruction of coordination polymers based on diphenylarsenic, diphenylphosphinic, and p-toluenesulfonic acids was studied by the method of thermogravimetry in an inert atmosphere. Manganese polysulfonate possesses the greatest thermal stability.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2586–2588, 1969. 相似文献
5.
Mikhno S. D. Filippova T. M. Kulachkina N. S. Suchkova I. G. Berezovskii V. M. 《Chemistry of Heterocyclic Compounds》1980,16(5):474-478
All four possible isomers of 4-ureido-3-hydroxy-2-(5-alkoxycarbonylbutyl)-thiophan were synthesized by the action of potassium isocyanate on the corresponding hydrochlorides (or hydrobromides) of the stereoisomers of A-amino-3-hydroxy-2[5-methoxy (or ethoxy)carbonylbutyl]thiophans, which were obtained by several methods. The configurations of the compounds obtained were proved by PMR spectroscopy.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 616–620, May, 1980 相似文献
6.
Maklakov LI Suchkova GG 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2008,71(1):238-244
Restricted Hartree-Fock and density function calculations (B3LYP), using 6-311++G(d,p), have been used to investigate the far infrared spectra of aromatic urethanes, synthesized on the basis of 2,4-and 2,6-toluene diisocyanate (2,4-TDI, 2,6-TDI), and the spectrum of ethylphenylurethane. It is shown, that the region of frequencies of 100-200cm(-1) is associated primarily with torsional vibrations of methyl groups. For almost all studied urethanes, the bands are observed in the region 385-340cm(-1), which is associated with in plane deformations of angles CCNC, COC and CNC of the urethane groups according to the calculations. The bands, observed at 300-320 and 260-280cm(-1), are assigned to in plane and out of plane deformations of the urethane skeleton, which are mixed with vibrations of methyl group connected to the benzene ring. 相似文献
7.
T. M. Filippova S. D. Mikhno N. S. Kulachkina I. G. Suchkova V. M. Berezovskii 《Chemistry of Heterocyclic Compounds》1981,17(12):1174-1178
The chemical shifts and the direct carbon-proton spin-spin coupling constants for a number of cis and trans isomers of 4-amino-substituted 3-hydroxy(acyloxy)-thiophans, the configurations of the substituents in which and the conformational states were previously established by an independent method, were studied. It was found that in the spectra of the cis isomers the signals of the vicinal 13C atoms, which bear the substituents, are shifted to strong field as compared with the trans isomers ( trans-cis 1.7–4.3 ppm). Conformational effects of the substituents on the chemical shifts of the ring 13C atoms were noted. It is shown that a relationship exists between the direct carbon-proton spin-spin coupling constants and the spatial orientations of the acyloxy and acylamino substituents for five-membered saturated rings.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1612–1616, December, 1981. 相似文献
8.
N. A. Klyuev G. S. Suchkova G. B. Lokshin A. D. Kuzovkov 《Chemistry of Natural Compounds》1981,17(2):183-188
The results are reported of a study of the dissociative ionization of fusidic acid and its derivatives, and also of an investigation of the products of its thermal degradation by the mass-spectrometric method. A scheme of fragmentation of the antibiotic under the action of electron impact is suggested.All-Union Scientific-Research Institute of Antibiotics, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 228–234, March–April, 1981. 相似文献
9.
G. S. Suchkova G. B. Lokshin A. D. Kuzovkov A. I. Chernyshev 《Chemistry of Natural Compounds》1979,15(1):54-56
Summary 11-Oxofusidic acid — a previously unknown keto derivative of the antibiotic — has been isolated from the products of the oxidation of fusidic acid by chromium trioxide.All-Union Scientific-Research Institute of Antibiotics, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 66–69, January–February, 1979. 相似文献
10.
The influence of the type and concentration of a dopant (P, Sb, B) on the dynamics of the transformation of a system of structural (intrinsic and radiation-induced) defects of silicon under low-intensity electron irradiation is investigated. A qualitative model is proposed for the formation of the complexes of secondary radiation defects responsible for the maxima of beta-induced softening of silicon single crystals. 相似文献