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排序方式: 共有101条查询结果,搜索用时 31 毫秒
31.
32.
Shaheen Siddiqui B Zhymabekovna Karzhaubekova Z Shahmanovna Burasheva G Adaibaevna Sultanova N 《Chemical & pharmaceutical bulletin》2007,55(9):1356-1360
Studies on the chemical constituents of the aerial parts of Kalidium foliatum have led to the isolation of three new and one known compounds. The structures of new constituents have been elucidated through spectral studies including 2D-NMR experiments (HMQC, HMBC, COSY, NOESY and J-resolved) and MS/MS fragmentation using Q-TOF mass spectrometer equipped with an ESI source as kalidiumoside C (=3beta-hydroxy-29-methylmalonoxy-olean-12-en-23,28-dioic acid-23-methyl-28-beta-D-glucopyranosyl ester; 1), kalidiunin (=3beta,23,29-trihydroxy-olean-12-en-28-methyl-oate; 2) and kalidiumoside D (=3beta,23,29-trihydroxyolean-12-en-28-oic acid-beta-D-glucopyranosyl ester; 3). The known compound was identified as 3beta,23,29-trihydroxy-olean-12-en-28-oic acid 4) through comparison of its spectral data with those reported in literature. Acid hydrolysis of both 2 and 3 yielded the known compound 4 providing a conclusive evidence of the proposed structures. 相似文献
33.
L. N. Ivanova A. N. Lobov A. A. Fatykhov R. M. Sultanova S. S. Zlotskii V. A. Dokichev 《Russian Journal of Organic Chemistry》2011,47(11):1755-1760
Reactions of 5-(allyloxymethyl)- and 5-(methallyloxymethyl)-5-ethyl-1,3-dioxanes with methyl diazoacetate catalyzed by Rh2(OAc)4 or Cu(OTf)2 in the presence of [bmim]+Cl−, [bmim]+BF4
−, and [bmim]+PF6
− proceed regioselectively at the C=C bond and lead to the formation of the corresponding cyclopropane-containing 1,3-dioxanes
in yields up to 62%. 相似文献
34.
L. N. Ivanova R. M. Sultanova S. S. Zlotsky V. A. Dokichev 《Russian Journal of General Chemistry》2012,82(4):663-667
Catalytic reaction of trans- and cis-1-chloropropenyl butyl ethers with methyl diazoacetate catalyzed by either Rh2(OAc)3, or Cu(OTf)2, or Cu(acac)2 in the presence of the imidazolium salts [bmim]+ Cl?, [bmim]+ BF 4 ? , and [bmim]+ PF 6 ? was studied. The composition and ratio of products formed was shown to depend on the reaction conditions and the nature and ratio of the components of the catalytic system. 相似文献
35.
36.
Vyacheslav F. Nikolaev Adel N. Satgaraev Rasima B. Sultanova 《Journal of solution chemistry》2012,41(6):953-964
For the first time symmetric models are presented for non-stoichiometric six-parameter models and comparative analysis has been carried out with empirical ternary symmetric and asymmetric models with the Redlich?CKister model taken as a basis. For asymmetric models on the basis of the component structuredness criteria, a simple quantitative mode is proposed for selecting the asymmetric component. On the basis of Chou??s method a new mode of computation has been proposed with the help of non-stoichiometric models. Calculations have been performed with the excess molar volumes and molar enthalpies dependence using ethanol or 1-butanol + triethylamine + n-hexane and 1-butanol + tri-n-butylamine (or tri-n-octylamine) + n-hexane mixtures as examples. 相似文献
37.
The two-dimensional problem of supercritical carbon dioxide injection into an aquifer is solved. Shocks and rarefaction waves propagating in a sequence from an injection well into the formation are described within the framework of a complete nonisothermal model of flows in a porous medium. In the approximation of isothermal immiscible water and carbon dioxide flow the hydrodynamic stability of the leading displacement front is investigated for various reservoir pressures and temperatures. The parameters of unstable fronts are determined using a sufficient instability condition formulated in analytic form. The approximate analytic results are supported by the direct numerical simulation of CO2 injection using the complete model in which thermal effects and phase transitions are taken into account. 相似文献
38.
Vladimir Burilov Diana Mironova Elsa Sultanova Ramila Garipova Vladimir Evtugyn Svetlana Solovieva Igor Antipin 《Molecules (Basel, Switzerland)》2021,26(22)
A new polymeric NHC carrier was synthesized by sequential supramolecular self-assembly and copper-catalyzed azide-alkyne cycloaddition (CuAAC) of amphiphilic imidazolium calix[4]arenes with octyl lipophilic fragments. Obtained polytriazole-imidazolium particles were found as monodisperse submicron particles, with the average diameter of 236 ± 34 nm and average molecular weight of 1380 ± 96 kDa. Successful CuAAC polymerization has been proved using IR spectroscopy and high-resolution ESI mass spectrometry. Polymeric particles, as well as aggregates made from precursor macrocycles, were decorated by Pd clusters (2 nm) for further catalytic investigations. Pd nanoclusters, supported on the polymeric surface, were found highly catalytically active in the model reduction of p-nitrophenol, giving reaction rates an order of magnitude higher compared to literature examples. The reaction was recycled using the same catalyst five times without any loss of activity. 相似文献
39.
V. V. Yanilkin N. V. Nastapova E. D. Sultanova G. R. Nasretdinova R. K. Mukhitova A. Yu. Ziganshina I. R. Nizameev M. K. Kadirov 《Russian Chemical Bulletin》2016,65(1):125-132
An efficient mediated electrosynthesis of the spherical (85 nm) nanocomposite material Pd@p(MVCA8+-co-St) was carried out in an aqueous medium. Ultrasmall palladium nanoparticles (3—8 nm) are stabilized in nanocapsules of water-soluble nanoparticles of the copolymer p(MVCA8+-co-St) consisting of tetraviologen calix[4]resorcinol (MVCA8+) with styrene (St). The role of the mediator is played by viologen units of a polymer nanoparticle at potentials of the MV2+/MV?+ redox couple. The high catalytic activity of the nanocomposite material in the reduction of nitrophenol with sodium borohydride is shown. 相似文献
40.
B. A. Tashpulatova Zh. Tashpulatov I. G. Sultanova N. Yu. Zukhrutdinova 《Chemistry of Natural Compounds》1994,30(5):619-621
The immobilization ofStreptomycs atratus glucose isomerase has been achieved and the periods of half-life of the immobilized glucose isomerase have been determined on various supports, among which the most acceptable are cotton lint and polyurethane. The stability of the immobilized preparations has been demonstrated. 相似文献