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Hovhannes Gharibian Gulnara Palikyan ShalikoH. Badanyan Kevin Paulsen GagikG. Melikyan 《Helvetica chimica acta》2000,83(12):3291-3294
Hydroalumination‐brominolysis of vinylacetylenic alcohols 1 – 4 provides a novel entry to synthetically useful (E)‐ and (Z)‐bromoalkadienols, and bromoallenols, which are otherwise hardly accessible. An electrophilic cleavage of cyclic intermediate A follows competing mechanistic pathways, giving rise to isomeric (Z)‐bromodienols 5 – 8 and allenic alcohols 9 – 12 . The latter are stereoselectively converted to (E)‐bromoalkadienols 13 – 16 by CuBr‐catalyzed anionotropic rearrangement. 相似文献
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Ziyafaddin H. Asadov Khuraman A. Mammadova Gulnara A. Ahmadova Saida F. Ahmadbayova 《Journal of Dispersion Science and Technology》2013,34(7):1022-1028
The influence of counterions on the surface properties of N-lauryl diisopropanolamine surfactants is delineated using conductometry and surface tension measurements. Twelve types of organic counterions have been studied: C1–C12 monocarboxylic acids anions. The surface properties of the synthesized surfactants, including surface tension, critical micelle concentration (CMC), effectiveness (πCMC), efficiency (pC20), maximum surface excess (Γmax), minimum surface area (Amin), Gibbs energy of micellization (ΔGmic), and adsorption (ΔGad) processes in the aqueous. The biodegradability of the prepared surfactants was tested in river water using the die-away method. Petroleum-collecting and petroleum-dispersing capacities of the synthesized compounds on the surface of water of varying mineralization degree have been studied. 相似文献
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Irina V. Konovalova Liliya M. Burnaeva Vladimir F. Mironov Sergey V. Romanov Gulnara A. Ivkova Aidar T. Gubaidullin 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1)
Abstract Phosphorus (111) containing dcrivatives of salicylic acid easily react with carbonyl compounds with formation of cycloexpansion products - 1,3,2- or 1,4,2-dioxaphosphepines. For the first time we have shown that dialkyl-l-oxólkylphosphonates react with 2-R-4-oxo-5,5-benzo-1,3,2-dioxaphosphorinanes and yield 1,3,2-dioxaphosphepines (I) with high stereoselectivity. The configuration of the preferable diastereoisomer (IId) has been determined by X-ray analysis. The hydrolysis of compounds (IIa-c) leads to formation of 2-hydroxy-2-oxo-1,3,2-dioxaphosphepines (III). The structure of phosphepine (IIIb) in crystal is shown on the figure. The work is supported by the Leading Scientific School Foundation of Russia (grant N 96-15-97330) and the Russian Foundation for Basic Research (grant N 98-03-33266). 相似文献
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Vladimir A. Dyakonov Gulnara N. Kadikova Ramil N. Nasretdinov Dmitry I. Kolokoltsev Usein M. Dzhemilev 《Tetrahedron letters》2017,58(17):1714-1716
The reaction between Si-containing alkynes and bis(1,3,5-cycloheptatriene-7-yl)alkanes in the presence of the two-component catalyst Ti(acac)2Cl2-Et2AlCl, led to the selective formation of mono- and bis-adducts – {9-[4-(2,4,6-cycloheptatrienyl)alkyl]-8-alkyl(phenyl)bicyclo[4.2.1]nona-2,4,7-triene-7-yl}(trimethyl)silanes and bis(7-trimethylsilyl-8-alkyl(phenyl)bicyclo[4.2.1]nona-2,4,7-triene-7-yl)alkanes in 78–86% yield. The structures of the obtained cycloadducts were confirmed by 1H and 13C NMR spectroscopy. 相似文献
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Vladimir A. Dyakonov Gulnara N. Kadikova Ramil N. Nasretdinov Usein M. Dzhemilev 《Tetrahedron letters》2017,58(19):1839-1841
The cycloaddition reaction between conjugated diynes and 1,3,5-cyclooctatriene in the presence of the catalyst Co(acac)2/dppe/Zn/ZnI2, led to the selective formation of tricyclo[4.2.2.02,5]deca-7,9-diene derivatives in 72–85% yield. 相似文献
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A study of specific interactions between lectins and glycoproteins has been carried out using surface plasmon resonance (SPR) in a flow-injection mode. Lectins were covalently immobilised on the surfaces of the microfluidic sensor chip via amine coupling and serum glycoproteins were injected into the flow channels. Specific lectin-glycoprotein interactions caused the shift of refractive index proportional to the mass concentration accumulated on the channel surface. Lectins showed different affinity to the tested glycoproteins and each glycoprotein displayed its own lectin-binding pattern. It is possible to distinguish and identify even glycoproteins with similar sugar structures by simple and quick screening. The working conditions of the assay were optimised. The lectin-based SPR made it possible to carry out the label-free detection of glycoproteins within a broad concentration range with a good linearity. Regeneration conditions for the surface of the sensor chip were found and optimised. Combination of 10 mM HCl and 10 mM glycine-HCl (pH 2.5) removes the bound glycoproteins from the lectin surface without damaging it. The kinetic and affinity parameters of lectin-glycoprotein binding were evaluated. The proposed method was tested on human glycosylated serum. Combination of the lectin panel with SPR is suitable both for specific screening and for sensitive assay of serum glycoproteins. 相似文献