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Zhil’tsova, E. P.; Timosheva, A. P.; Shagidullina, R. A.; Mustafina, A. R.; Kudryavtseva, L. A.; Катаев, В. Е.; Kazakova, E. Kh.; Nikolaev, V. F.; Коновалов, А. И.

doi:10.1023/a:1012313219409

Russian Journal of General Chemistry

2001

DOI: 10.1023/a:1012313219409

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E. P. Zhil’tsova

A. P. Timosheva

R. A. Shagidullina

et al.

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Cited by 3 publications

(3 citation statements)

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“…Formation of micellar aggregates of I in chloroform at 20 350oC proceeds in the concentration range 0.00330.015 M. The aggregation behavior of I in the presence of polyethylenimines was studied by the dielcometric method. Figure 1 shows the concentration dependence of the orientational polarization (P or,exp ) of solutions of I in the absence and in the presence of III and V. In all the cases, in the initial part of the curve an increase in the concentration of I causes a decrease in the orientational polarization, which is followed by a flat minimum in the concentration range 0.00330.005 M and certain increase beginning from the concentration of 0.012 M. Such a pattern, according to [9], is attributable to the formation of micellar aggregates and reconstruction of their structure at higher concentrations of the surfactant.…”

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confidence: 82%

“…Inflections of the second type are associated with a sharp increase in the dielectric permittivity at a high content of the polymers in solutions. According to [9], inflections of the first type may be caused by the appearance of symmetric sites due to self-association of polyethylenimines through intramolecular interactions in the polymeric chain. The presence of two inflections in the range of low concentrations of III and IV (Fig.…”

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confidence: 99%

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Inverse Micellar Catalysis of Phosphorylation of Hydroxybenzylated Polyethylenimines

et al. 2005

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The aggregation in polyethylenimine3chloroform and cetyltrimethylammonium bromide3poly-ethylenimine3chloroform systems is studied by dielcometric titration. Inverse micelles of cetyltrimethylammonium bromide catalyze the phosphorylation of hydroxybenzylated polyethylenimines in chloroform. The dependence of parameters of the micelle-catalyzed reaction on the structure and concentration of polyethylenimine and on the reaction temperature is studied. The inverse micelles affect the complexation of polyethylenimines with 4-nitrophenol.

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confidence: 82%

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Inverse Micellar Catalysis of Phosphorylation of Hydroxybenzylated Polyethylenimines

et al. 2005

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“…Presence of inflections in the ZHIL'TSOVA et al Dependence of orientational polarization of (1) solutions of a mixture of compounds I and II (5 : 1), (2) of compound I, and (3) of compound II in chloroform on the concentration of detergents at 20oC.concentration range 0.00230.008 M on the charateristic curves of compound I, of the surfactant II, and of the mixture of compounds I and II, according to affect[16] may be explained by the alteration of the colloid state of solutions caused by the formation of the reversed micellar aggregates. Formation of the latter may caffect atalytical properties of used systems, that may be shown on an example of the reactions of macrocycle IV and diamine V with the ester III.…”

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Phosphorylation of Pyrimidinophane in the Reversed Micellar Solutions of Cationic and Nonionogenic Surfactants

et al. 2005

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Reactions of a macrocycle containing three pyrimidine fragments and N,N`-bis(2-methylthio-6-methylpyrimidin-4-yl)-hexamethylenediamine with p-nitrophenyl bis(chloromethyl)phosphinate in the micellar solutions of cetyltrimethylammonium bromide, polyethyleneglycol-600 laurate and their mixture in chloroform was investigated spectrophotometrically. Catalytic activity of micelles depends on their structure, concentration of surfactants, molar fraction of the latter in solution, and structure of the nucleophilic reagent.

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Alkylated polyethyleneimine-cationic surfactant-calix[4]resorcinarene-chloroform catalytic system

et al. 2012

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The polymer-colloid complexes that form in solutions of polymers and nonmacromolecular amphiphilic compounds as a result of noncovalent interactions can function as nanoreactors produc ing metal nanoparticles [1] and catalysts for the hydrolysis of phosphorus acid esters [2, 3] and 2 (4 alkoxyphenyl) 1,3 dioxolanes [4]. The amphiphilic component can be a conventional surfactant (anionic, cationic, or nonionic) [5], a pyrimidi nophane [6,7], or a calixarene [8,9]. In the latter case, in addition to the sorption and solubilization binding of the reactants by the polymer-colloid aggregates, there can be inclusion type interactions [5] that enhance the reactant concentrating effect and are thus favorable for the catalytic action of the system.Here, we report the catalytic activity of supramo lecular systems based on alkylated polyethyleneimine, cationic surfactants with different structures, and calix[4]resorcinarenes (CRs) with 2 hydroxyethoxy and phosphorus containing substituents on the upper rim and alkyl substituents on the lower rim of the mac romolecule in chloroform.The polymer component was branched polyethylene imine modified with alkyl (n tetradecyl) substituents (APEI). The molar mass of its unit was 229. The degree of substitution (ratio of the number of substi tuted polyethyleneimine fragments to the number of unsubstitued fragments) was 0.6. The surfactants had a cyclic or bicyclic head. The former group of surfac tants consisted of hexadecylpyridinium bromide (HPB) and N octadecyl N (2 hydroxyethyl)piperi dinium bromide (OHPB), and the latter consisted of alkylated derivatives of 1,4 diazabicyclo[2.2.2]octane (AD 12, AD 16, and AD 18):Abstract-The kinetics of phosphorylation of alkylated polyethyleneimine in chloroform in the presence of cationic surfactants with a cyclic or bicyclic head group and alkylated calix[4]resorcinarenes has been inves tigated by UV spectrophotometry. The catalytic activity of individual and mixed solutions of the amphiphilic admixtures depends on the structure of the constituents of the composition, on their concentrations in the solution, and on their relative amounts. In the presence of a calixarene, a decrease in the surfactant and poly mer concentrations enhances the catalytic effect of the system.

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Cited by 3 publications

References 3 publications

Inverse Micellar Catalysis of Phosphorylation of Hydroxybenzylated Polyethylenimines

Inverse Micellar Catalysis of Phosphorylation of Hydroxybenzylated Polyethylenimines

Phosphorylation of Pyrimidinophane in the Reversed Micellar Solutions of Cationic and Nonionogenic Surfactants

Alkylated polyethyleneimine-cationic surfactant-calix[4]resorcinarene-chloroform catalytic system

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