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3829677 
Journal Article 
Reaction kinetics on hydrolysis of substituted di-phenyl phosphate ester in different borate buffers 
Kumar, A; Yadav, SS 
2010 
Yes 
Journal of the Indian Chemical Society
ISSN: 0019-4522 
87 
7 
863-867 
English 
WOS:000281077200015 
The reaction of hydroxide ion with di-4-methyl phenyl phosphate has been studied in the presence of micelles of cationic detergent. It has been investigated at pH 8.0 to 10.0 at 40 +/- 0.10 degrees C in aqueous dioxane di-phosphate esters. Pseudo-first order rate constants k(psi) and k'(w) have been measured spectrophotometrically by rate of appearance of inorganic phosphate during hydrolysis. k(psi), and k'(w) were rate constants with and without CTAB, which varied in between 0.02 x 10(-3) to 2 x 10(-3) mol dm(-3) and the concentration of phosphate was restricted to 5.0 x 10(-3) s(-1). Rate constants increase with concentrations of CTAB, giving at rate maximum. k(psi) = 67.03 x 10(-5) s(-1) at 18 x 10(-3) mol dm(-3) CTAB and k(psi) = 52.43 x 10(-5) s(-1) at 16 x 10(-3) mol dm(-3) CTAB respectively at pH 8.0 and 9.0 for di-anions of 4-mpp. The values of ion exchange parameter calculated at pH 8.0 and 9.0 by using various ion exchange equations have been summarized. The activation energy is 25.08 kcal/mol and entropy is 52.07 [-Delta S(eu)], which has been found at pH 8.0 and used borate buffer 3.9 x 10(-3) mol dm(-3) [OH(-)]. 
Borate buffer; hydrolysis; diphenyl phosphate ester; kinetics 
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