Alkaline hydrolysis of ethylp-nitrophenyl chloromethylphosphonate in the reverse micellar AOT—decane—water system

1999 ◽  
Vol 48 (12) ◽  
pp. 2240-2244 ◽  
Author(s):  
L. Ya. Zakharova ◽  
F. G. Valeeva ◽  
L. A. Kudryavtseva ◽  
A. I. Konovalov ◽  
N. L. Zakharchenko ◽  
...  
Keyword(s):  
Alkaline Hydrolysis ◽  
Water System ◽  
Hydrolysis Of ◽  
Reverse Micellar

Kinetics of alkaline hydrolysis of ethylp-nitrophenyl ethylphosphonate in the reverse micellar system: sodium dodecyl sulfate-hexanol-water

2000 ◽  
Vol 49 (2) ◽  
pp. 265-269
Author(s):  
L. Ya. Zakharova ◽  
F. G. Valeeva ◽  
L. A. Kudryavtseva ◽  
V. E. Bel'skii ◽  
E. P. Zhil'tsova ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Alkaline Hydrolysis ◽  
Sodium Dodecyl ◽  
Micellar System ◽  
Dodecyl Sulfate ◽  
Reverse Micellar System ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
System Sodium ◽  
Reverse Micellar

scholarly journals Kinetics of the alkaline hydrolysis of crystal violet in micelles, reverse micelles and microemulsions of cetyltrimethylammonium bromide

1970 ◽  
Vol 24 (2) ◽  
pp. 173-184 ◽  
Author(s):  
Ferdousi Begum ◽  
Md Yousuf A Molla ◽  
M Muhibur Rahman ◽  
Md Abu Bin Hasan Susan
Keyword(s):  
Crystal Violet ◽  
Alkaline Hydrolysis ◽  
Reverse Micelles ◽  
Cetyltrimethylammonium Bromide ◽  
Specific Conductivity ◽  
Water System ◽  
Chemical Society ◽  
Order Rate Constant ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetics of the alkaline hydrolysis of crystal violet (CV) in micelles, reverse micelles and microemulsions of a cationic surfactant, cetyltrimethylammonium bromide (CTAB) was studied at 25 ± 0.1 oC using spectrophotometric method. The rate of alkaline hydrolysis of CV was catalyzed by micellar solutions of CTAB. The pseudo first order rate constant (k') has been found to decrease upon incorporation of 1-butanol to cationic CTAB micelles, which displaces the substrate from the micellar into the aqueous phase. In CTAB/cyclohexane/1-butanol/water system, as the content of 1-butanol increases, specific conductivity and density of the microemulsions and reverse micelles decrease. The change in physical properties also causes change in reaction environment. A change from a micelle-rich (o/w) to a reverse micelle-rich (w/o) condition is apparent for microemulsions and consequently the k' vs. % wt. of 1-butanol profiles show an initial decrease in the k' followed by a gradual increase and finally, to a sharp increase with increasing 1-butanol content. Microemulsions and reverse micelles thus offer the potential to control rate of a reaction by formation of micelles in water phase and reverse micelles in oil phase. DOI: http://dx.doi.org/10.3329/jbcs.v24i2.9706 Journal of Bangladesh Chemical Society, Vol. 24(2), 173-184, 2011

scholarly journals Alkaline hydrolysis of wool fat (lanolin) in a medium of proton and aprotic solvents

2018 ◽  
pp. 4-9
Author(s):  
Saparkali Konuspayev ◽  
Batiha Kassenova ◽  
Zauresh Akhatova ◽  
Roza Nurbaeva
Keyword(s):  
Alkaline Hydrolysis ◽  
Raw Materials ◽  
Water System ◽  
Raw Material ◽  
Triterpene Alcohols ◽  
System A ◽  
Alcohol Water ◽  
Processing Plants ◽  
Wool Processing ◽  
Hydrolysis Of

The raw material being studied is the woolen fat of the sheep of the Edilbay fine-fleece and Kazakh arkharomeric fine-fleece, which is excreted when washing wool in primary wool processing plants (PWP) in the regions of Kazakhstan, such as Semipalatinsk, Aktyubinsk, Zhambyl and Tokmak. Earlier we obtained anhydrous lanolin from the fat of various factories of the PWP. In both cases, positive results were obtained and a certificate of compliance of anhydrous lanolin FS RK was obtained. In terms of its chemical composition, wool fat is a mixture of C10-C16 carboxylic acid esters with aliphatic, terpenic, triterpene and sterol alcohols. It also contains vitamins, proteins, sterols and other physiologically active compounds. In the hydrolysis of wool fat, a mixture of sterol alcohols, triterpene alcohols and fatty acid salts are assumed. Valuable among them are sterol alcohols, which constitute up to 29% of the sum of all alcohols. Cholesterol and its derivatives are the raw materials for the synthesis of steroid drugs. Salts of fatty acids are used as an emulsifier in pharmacy and cosmetology. The aim of this paper is to complete the saponification of wool fat and the separation of a mixture of sterol alcohols. We show the patterns of alkaline hydrolysis of wool fat in the liquid phase in the presence of mixtures of various solvents. As a solvent, the ethanol-water, isopropanol-water system in which wool fat is only partially dissolved has been studied. In the wool fat-alcohol-water-NaOH system, a stable emulsion is formed. Ways that prevent the formation of an emulsion are proposed.

Kinetis of the reaction of alkaline hydrolysis of thiophosphates in micellar and hexagonal phases of the cetyldimethylethylammonium bromide/NaOH/water system.

2001 ◽  
Vol 91 (1-3) ◽  
pp. 177-183 ◽  
Author(s):  
R.F. Bakeeva ◽  
L.A. Kudryavtseva ◽  
D.B. Kudryavtsev ◽  
V.F. Sopin
Keyword(s):  
Alkaline Hydrolysis ◽  
Water System ◽  
Hydrolysis Of

Kinetics of alkaline hydrolysis of esters of phosphorus acids in micellar and hexagonal phases in the cetyldimethylethylammonium bromide—NaOH—water system

1998 ◽  
Vol 47 (8) ◽  
pp. 1454-1459 ◽  
Author(s):  
R. F. Bakeeva ◽  
L. A. Kudryavtseva ◽  
G. Eme ◽  
E. M. Kosacheva ◽  
V. E. Bel'skii ◽  
...  
Keyword(s):  
Alkaline Hydrolysis ◽  
Water System ◽  
Esters Of Phosphorus Acids ◽  
Hydrolysis Of Esters ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetic investigation on alkaline hydrolysis of tris-(2,2ʹ-bipyridine)iron(II) in CTAB reverse micellar media

2015 ◽  
Vol 209 ◽  
pp. 99-103 ◽  
Author(s):  
Arjama Kundu ◽  
Somnath Dasmandal ◽  
Suparna Rudra ◽  
Ambikesh Mahapatra
Keyword(s):  
Alkaline Hydrolysis ◽  
Kinetic Investigation ◽  
Micellar Media ◽  
Hydrolysis Of ◽  
Reverse Micellar

Influence of medium on alkaline hydrolysis of succinic acid monomethyl and monopropyl esters

1980 ◽  
Vol 45 (11) ◽  
pp. 2873-2882
Author(s):  
Vladislav Holba ◽  
Ján Benko
Keyword(s):  
Succinic Acid ◽  
Kinetic Parameters ◽  
Alkaline Hydrolysis ◽  
Specific Interactions ◽  
Nonaqueous Media ◽  
The Media ◽  
Kinetics Of ◽  
Hydrolysis Of

The kinetics of alkaline hydrolysis of succinic acid monomethyl and monopropyl esters were studied in mixed aqueous-nonaqueous media at various temperatures and ionic strengths. The results of measurements are discussed in terms of electrostatic and specific interactions between the reactants and other components of the reaction mixture. The kinetic parameters in the media under study are related to the influence of the cosolvent on the solvation sphere of the reactants.

Synthesis of Normuramic Acid Carba Analog and Its Glycopeptide Derivative Resistant to β-Elimination Splitting of the Side Chain

2000 ◽  
Vol 65 (11) ◽  
pp. 1726-1736 ◽  
Author(s):  
Miroslav Ledvina ◽  
Radka Pavelová ◽  
Anna Rohlenová ◽  
Jan Ježek ◽  
David Šaman
Keyword(s):  
Ethyl Ester ◽  
Alkaline Hydrolysis ◽  
Benzyl Ester ◽  
Side Chain ◽  
Propanoic Acid ◽  
Hydrolysis Of

Carba analogs of normuramic acid, i.e., 3-(benzyl 2-acetamido-2,3-dideoxy-4,6-O-isopropylidene-α-D-glucopyranosid-3-yl)propanoic acid derivatives (nitrile or esters) 3a-3c were prepared by addition of radicals generated from benzyl 2-acetamido-2-deoxy-4,6-O-isopropylidene-3-O-[(methylsulfanyl)thiocarbonyl]- (2a) or -3-O-(phenoxythiocarbonyl)-α-D-glucopyranoside (2b) with Bu3SnH to acrylonitrile or acryl esters. Alkaline hydrolysis of ethyl ester 3c afforded 3-(benzyl 2-acetamido-2,3-dideoxy-4,6-O-isopropylidene-α-D-glucopyranosid-3-yl)propanoic acid (5). Coupling of acid 5 with L-2-aminobutanoyl-D-isoglutamine benzyl ester trifluoroacetate and subsequent deprotection of the intermediate 6 furnished N-[3-(2-acetamido-2,3-dideoxy-α-D-glucopyranosid-3-yl)propanoyl]-L-2-aminobutanoyl-D-isoglutamine (7).

Kinetic study of hydrolysis of benzoates. part xxvii. ortho substituent effect in alkaline hydrolysis of phenyl esters of substituted benzoic acids in aqueous Bu4NBr

2009 ◽  
Vol 74 (1) ◽  
pp. 29-42 ◽  
Author(s):  
Vilve Nummert ◽  
Mare Piirsalu ◽  
Signe Vahur ◽  
Oksana Travnikova ◽  
Ilmar A. Koppel
Keyword(s):  
Alkaline Hydrolysis ◽  
Rate Constants ◽  
Pure Water ◽  
Substituent Effects ◽  
Benzoic Acids ◽  
Resonance Effects ◽  
The Media ◽  
Substituted Benzoic Acids ◽  
Hydrolysis Of ◽  
Ortho Substituent

The second-order rate constants k (in dm3 mol–1 s–1) for alkaline hydrolysis of phenyl esters of meta-, para- and ortho-substituted benzoic acids, X-C6H4CO2C6H5, have been measured spectrophotometrically in aqueous 0.5 and 2.25 M Bu4NBr at 25 °C. The substituent effects for para and meta derivatives were described using the Hammett relationship. For the ortho derivatives the Charton equation was used. For ortho-substituted esters two steric scales were involved: the EsB and the Charton steric (υ) constants. When going from pure water to aqueous 0.5 and 2.25 M Bu4NBr, the meta and para polar effects, the ortho inductive and resonance effects in alkaline hydrolysis of phenyl esters of substituted benzoic acids, became stronger nearly to the same extent as found for alkaline hydrolysis of C6H5CO2C6H4-X. The steric term of ortho-substituted esters was almost independent of the media considered. The rate constants of alkaline hydrolysis of ortho-, meta- and para-substituted phenyl benzoates (X-C6H4CO2C6H5, C6H5CO2C6H4-X) and alkyl benzoates, C6H5CO2R, in water, 0.5 and 2.25 M Bu4NBr were correlated with the corresponding IR stretching frequencies of carbonyl group, (ΔνCO)X.

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