Hydrolysis Kinetics of Thifensulfuron Methyl in Aqueous Buffer Solutions

1996 ◽  
Vol 44 (1) ◽  
pp. 333-337 ◽  
Author(s):  
Jean-Pierre Cambon ◽  
Jean Bastide
Keyword(s):  
Hydrolysis Kinetics ◽  
Aqueous Buffer ◽  
Buffer Solutions ◽  
Kinetics Of

Kinetics of the base-catalyzed bromination of nitroacetone

1962 ◽  
Vol 270 (1342) ◽  
pp. 411-416 ◽  
Keyword(s):  
Zero Order ◽  
Aqueous Buffer ◽  
Buffer Solutions ◽  
Carboxylate Anions ◽  
Kinetics Of ◽  
Catalytic Effects

The kinetics of the bromination of nitroacetone at 0 °C have been studied in aqueous buffer solutions, the disappearance of bromine being followed by measuring the redoxpotential. The reaction is of zero order with respect to bromine and exhibits general catalysis by bases, so that the observed rate is that of the ionization of the ketone. The catalytic effects of five carboxylate anions are closely related to the basic strengths of the catalysts. The results are discussed in relation to the behaviour of analogous substances.

Kinetics of the base-catalyzed halogenation of 2-carbetboxycyclobexanone

1952 ◽  
Vol 210 (1102) ◽  
pp. 322-326 ◽  
Keyword(s):  
Carboxylic Acids ◽  
Opposite Direction ◽  
Zero Order ◽  
Water Molecules ◽  
Ring Strain ◽  
Aqueous Buffer ◽  
First Order ◽  
Buffer Solutions ◽  
Carboxylate Anions ◽  
Kinetics Of

The kinetics of iodination of 2-carbethoxycyclohexanone have been studied colorimetrically in aqueous buffer solutions. The reaction is of the first order with respect to the ester, of zero order with respect to iodine, and is catalyzed by water molecules and by the anions of carboxylic acids. The catalytic constants of four carboxylate anions obey a relation of the Bronsted type, the exponent of which conforms to regularities previously established for a series of ketones and esters. Under comparable conditions 2-carbethoxycyclohexanone is halogenated 100 to 400 times more slowly than is 2-carbethoxycyclopentanone. This difference is in the opposite direction to that anticipated on the basis of ring strain, though it is paralleled by some other observations on 5- and 6-membered rings.

Kinetics of the base-catalyzed bromination of ethyl nitroacetate

1959 ◽  
Vol 251 (1264) ◽  
pp. 41-45 ◽  
Keyword(s):  
Zero Order ◽  
Aqueous Buffer ◽  
First Order ◽  
Keto Esters ◽  
Buffer Solutions ◽  
Pyridine Bases ◽  
Carboxylate Anions ◽  
Ethyl Nitroacetate ◽  
Kinetics Of ◽  
Catalytic Effects

The kinetics of the bromination of ethyl nitroacetate have been studied in aqueous buffer solutions. The reaction is of the first order with respect to the ester, and of zero order with respect to bromine; it exhibits general catalysis by bases. The catalytic effects of six carboxylate anions and two pyridine bases are closely related to their basic strengths, but in other respects the reaction does not conform to the regularities previously found for the rates of ionization of ketones and keto-esters.

Kinetics of the base-catalyzed bromination of s -dichloroacetone

1960 ◽  
Vol 255 (1281) ◽  
pp. 214-217 ◽  
Keyword(s):  
Aqueous Solution ◽  
Carbonyl Group ◽  
Zero Order ◽  
Degree Of Hydration ◽  
Aqueous Buffer ◽  
Buffer Solutions ◽  
Polar Groups ◽  
Carboxylate Anions ◽  
Kinetics Of ◽  
Catalytic Effects

The kinetics of the bromination of s -dichloroacetone have been studied in aqueous buffer solutions. The reaction is of zero order with respect to bromine and exhibits general catalysis by bases, so that the observed rate is that of the ionization of the ketone. The catalytic effects of four carboxylate anions and of water are closely related to the basic strengths of the catalysts. In relating rates of ionization to the structures of substituted ketones it is neces­sary to correct the observed rates for the degree of hydration of the carbonyl group in aqueous solution. The corrected rates for acetone and its chloro-derivates are discussed in terms of the polar groups which they contain.

Hydrolysis and Hydrolysis Pathways of Composite of Copper (II) and Cypermethrin

2011 ◽  
Vol 356-360 ◽  
pp. 70-73
Author(s):  
Ping Li Wang ◽  
Ji Min Xie ◽  
Jun Liu ◽  
Xiao Jun Wei
Keyword(s):  
Copper Ion ◽  
Hydrolysis Kinetics ◽  
First Order ◽  
Buffer Solutions ◽  
First Order Kinetics ◽  
Kinetics Of ◽  
Hydrolysis Of

The composite of copper ion and cypermethrin (CPM) may affect the hydrolysis of CPM. The experiments considered different factors which may affect the hydrolysis of pesticides, using buffer solutions with different pH to study the hydrolysis of CPM. The results showed that the existence of Cu2+ significantly promoted the hydrolysis of CPM, which might be related to the complexes that Cu2+ and CPM had produced. The hydrolysis kinetics of CPM followed the first-order kinetics. We used GC/MS to detect the hydrolysis of CPM intermediates and proposed the possible hydrolysis pathways.

Trypsin entrapped within liposomes. Partition of a low-molecular-mass substrate as the main factor in kinetic control of hydrolysis

1991 ◽  
Vol 56 (3) ◽  
pp. 712-717 ◽  
Author(s):  
Jana Formelová ◽  
Albert Breier ◽  
Peter Gemeiner ◽  
Lubica Kurillová
Keyword(s):  
Molecular Mass ◽  
Egg Yolk ◽  
Kinetic Control ◽  
Hydrolysis Kinetics ◽  
Liposomal Membrane ◽  
Kinetics Of ◽  
Main Factor

Trypsin has been entrapped within liposomes prepared from egg yolk phospholipides by the method of controlled dialysis, and the hydrolysis kinetics of Nα-benzoyl-DL-arginine p-nitroaniline catalyzed by the liposome-entrapped trypsin has been studied by monitoring the flux of substrate and product across the liposomal membrane. The partitioning of the substrate and product between liposomal and extraliposomal environment has been found to represent the main factor in the kinetic control of the hydrolysis.

ChemInform Abstract: Stepwise Hydrolysis Kinetics of Tetrachloroplatinate(II) in Base.

ChemInform ◽  
1990 ◽  
Vol 21 (49) ◽  
Author(s):  
L. WU ◽  
B. E. SCHWEDERSKI ◽  
D. W. MARGERUM
Keyword(s):  
Hydrolysis Kinetics ◽  
Kinetics Of
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