Autor: |
Ghosh, KallolK., Bal, Sunita, Satnami, ManmohanL., Rodriguez‐Dafonte, P., Palepu, RamaM. |
Předmět: |
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Zdroj: |
Journal of Dispersion Science & Technology; May2006, Vol. 27 Issue 3, p349-355, 7p, 3 Diagrams, 5 Charts, 2 Graphs |
Abstrakt: |
Pseudo-first-order rate constants have been determined for the nucleophilic substitution reactions of p -nitrophenyl acetate with oxalo, malono, and succinodihydroxamate ions ( - ONHC(O)(CH 2 ) n C(O)NHO - ) in phosphate buffer (pH=7.9) at 27°C. The rate data of the reaction revealed that the nucleophilic reactivity sequence of these hydroxamate ions is generally ODHA>MDHA>SDHA. The k obs value increases upon addition of cationic surfactants to the reaction medium which is typical behavior of micelle-assisted bimolecular reactions. The pseudo-phase ion exchange model has been successfully applied to determine binding constant. [ABSTRACT FROM AUTHOR] |
Databáze: |
Complementary Index |
Externí odkaz: |
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