Reactivity of inorganic α-nucleophiles in acyl group transfer processes in water and surfactant micelles: I. Systems based on organic complexes of tribromide anion
作者:M. K. Turovskaya、V. A. Mikhailov、N. I. Burakov、I. V. Kapitanov、T. M. Zubareva、V. L. Lobachev、B. V. Panchenko、T. M. Prokop’eva
DOI:10.1134/s107042801703006x
日期:2017.3
from water to micelles. Micellareffects of surfactants are determined by the nucleophilicity of hypobromite ion in surfactant micelles and by solubilization of the substrate and BrO–, which largely depend on the counterion concentration in the micelle surface layer. The main factor responsible for the observed acceleration is increased reactant concentration in the micellar pseudophase.
Kinetics of alkaline hydrolysis of esters of phosphorus acids in micellar and hexagonal phases in the cetyldimethylethylammonium bromide—NaOH—water system
作者:R. F. Bakeeva、L. A. Kudryavtseva、G. Eme、E. M. Kosacheva、V. E. Bel'skii、D. B. Kudryavtsev、R. R. Shagidullin、V. F. Sopin
DOI:10.1007/bf02495592
日期:1998.8
reactions in the micellar phase were determined. In micellar solutions of systemI, a tenfold increase in the rates of alkalinehydrolysis of2–4 was observed. An increase in the degree of medium ordering during the formation of the E-phase results in a twofold acceleration of alkalinehydrolysis of2 and3 and in the inhibition of this process in the case of4.
十六烷基二甲基乙基溴化铵-NaOH-水体系(I)胶束(Mi)和六方(E)中间相对O-对硝基苯基-O,O-磷酸二乙酯(2),O-硝基苯基碱水解速率的影响通过紫外分光光度法研究了-O-乙基乙基膦酸酯(3)和O,O-二(对硝基苯基)甲基膦酸酯(4)。确定了底物的结合常数、临界胶束浓度和胶束相中反应的速率常数。在系统 I 的胶束溶液中,观察到 2-4 的碱水解速率增加了 10 倍。在 E 相形成过程中介质有序度的增加导致 2 和 3 的碱性水解的两倍加速,并在 4 的情况下抑制了该过程。
Supernucleophilic systems based on functionalized surfactants in the decomposition of 4-nitrophenyl esters derived from phosphorus and sulfur acids: I. Reactivity of a hydroxyimino derivative of gemini imidazolium surfactant
作者:I. V. Kapitanov、I. A. Belousova、A. E. Shumeiko、M. L. Kostrikin、T. M. Prokop’eva、A. F. Popov
DOI:10.1134/s1070428013090091
日期:2013.9
dichloride, and its non-micelle-forming methyl analog, were synthesized. Nucleophilicity of the oximate group in these compounds in the decomposition of 4-nitrophenyl esters derived from phosphorus and sulfur acids follows Brønsted relations for monomeric functionalized surfactants and non-micelle-forming oximes. As compared to the single-chained analog, the gemini surfactant ensured the same observed
Catalytic effect of supramolecular system based on cationic surfactant and monopodands in nucleophilic substitution of phosphorus esters
作者:F. G. Valeeva、A. V. Zakharov、M. A. Voronin、L. Ya. Zakharova、L. A. Kudryavtseva、O. G. Isaikina、A. A. Kalinin、V. A. Mamedov
DOI:10.1023/b:rucb.0000046255.85293.5f
日期:2004.7
podands with terminal quinoxaline fragments of rings and their influence on both the micellization properties of cetyltrimethylammonium bromide in a water—DMF solution and kinetics of basichydrolysis of O-p-nitrophenyl O-ethyl chloromethylphosphonate and O-p-nitrophenyl O-hexyl chloromethylphosphonate in the absence and presence of surfactants. The mechanism of the podand effect on the reaction rate
Kinetics of reactions of ethylp-nitrophenyl ethylphosphonate with anionic nucleophiles in a detergentless microemulsion
作者:V. E. Bel'skii、F. G. Valeeva
DOI:10.1007/bf02498265
日期:1999.12
The kinetics of reactions of ethylp-nitrophenyl ethylphosphonate with anionic nucleophiles in a detergentless water—oil microemulsion, formed in then-hexane—water—isopropyl alcohol system, was studied. The rate constants of the reactions in the microemulsion are higher than those in aqueous solutions and increase with increasing isopropyl alcohol: water ratio.