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Statements

Subject Item
n2:RIV%2F60162694%3AG44__%2F11%3A00002475%21RIV12-MO0-G44_____
rdf:type
n10:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1002/kin.20590
dcterms:description
The reactions of p-nitrophenyl acetate (PNPA) with a series of monopyridinium oximes, viz. 2-PAM (2-hydroxyiminomethyl-1-methylpyridinium iodide), 3-PAM (3-hydroxyiminomethyl-1-methylpyridinium iodide), and 4-PAM (4-hydroxyiminomethyl-1-methylpyridinium iodide) have been studied in the presence of cationic surfactants of same hydrophobic chain length (C(16)) within the concentration range of 0.5-6.0 mM at pH 8.0 under the pseudo-first-order condition. The observed rate constant (k(obs)) increases with increasing surfactant concentration culminating into a maximum, and this has been analyzed in detail following the concepts of micellar catalysis. The structure-activity relationship of the investigated oximes has been discussed, and 2-PAM was found to be the most reactive among all the three investigated oximes for the cleavage of PNPA. Esterolytic decomposition of p-nitrophenyldiphenyl phosphate with oximate ions (-CH=NO(-)) was followed in cetyltrimethylammonium bromide micelles at pH 9.0, and 4-PAM was the most reactive oxime for the micellar hydrolysis of phosphate ester. The apparent acid dissociation constants (pK(a)) of the investigated oximes have been determined spectrophotometrically. The reactions of p-nitrophenyl acetate (PNPA) with a series of monopyridinium oximes, viz. 2-PAM (2-hydroxyiminomethyl-1-methylpyridinium iodide), 3-PAM (3-hydroxyiminomethyl-1-methylpyridinium iodide), and 4-PAM (4-hydroxyiminomethyl-1-methylpyridinium iodide) have been studied in the presence of cationic surfactants of same hydrophobic chain length (C(16)) within the concentration range of 0.5-6.0 mM at pH 8.0 under the pseudo-first-order condition. The observed rate constant (k(obs)) increases with increasing surfactant concentration culminating into a maximum, and this has been analyzed in detail following the concepts of micellar catalysis. The structure-activity relationship of the investigated oximes has been discussed, and 2-PAM was found to be the most reactive among all the three investigated oximes for the cleavage of PNPA. Esterolytic decomposition of p-nitrophenyldiphenyl phosphate with oximate ions (-CH=NO(-)) was followed in cetyltrimethylammonium bromide micelles at pH 9.0, and 4-PAM was the most reactive oxime for the micellar hydrolysis of phosphate ester. The apparent acid dissociation constants (pK(a)) of the investigated oximes have been determined spectrophotometrically.
dcterms:title
Hydrolysis of carboxylate and phosphate esters using monopyridinium oximes in cationic micellar media Hydrolysis of carboxylate and phosphate esters using monopyridinium oximes in cationic micellar media
skos:prefLabel
Hydrolysis of carboxylate and phosphate esters using monopyridinium oximes in cationic micellar media Hydrolysis of carboxylate and phosphate esters using monopyridinium oximes in cationic micellar media
skos:notation
RIV/60162694:G44__/11:00002475!RIV12-MO0-G44_____
n3:aktivita
n19:P
n3:aktivity
P(OVUOFVZ200803)
n3:cisloPeriodika
10
n3:dodaniDat
n13:2012
n3:domaciTvurceVysledku
n6:9644830 n6:6306888
n3:druhVysledku
n4:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
203143
n3:idVysledku
RIV/60162694:G44__/11:00002475
n3:jazykVysledku
n16:eng
n3:klicovaSlova
in-vitro; acetylcholinesterase reactivators; nucleophilic-substitution; nerve agents; pralidoxime; systems; acceleration; assemblies; reactivity; catalysis
n3:klicoveSlovo
n9:reactivity n9:catalysis n9:systems n9:assemblies n9:acceleration n9:acetylcholinesterase%20reactivators n9:nerve%20agents n9:in-vitro n9:pralidoxime n9:nucleophilic-substitution
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[7F0A726376CE]
n3:nazevZdroje
International Journal of Chemical Kinetics
n3:obor
n14:CC
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:projekt
n17:OVUOFVZ200803
n3:rokUplatneniVysledku
n13:2011
n3:svazekPeriodika
43
n3:tvurceVysledku
Singh, Namrata Ghosh, Kallol K Marek, Jan Kuča, Kamil
n3:wos
000294225300006
s:issn
0538-8066
s:numberOfPages
10
n7:organizacniJednotka
G44