title: Nucleophilic dephosphorylation of p-nitrophenyl diphenyl phosphate in cationic micellar media.
abstract: The kinetics of nucleophilic dephosphorylation of p-nitrophenyl diphenyl phosphate by hydroxamate ions (R'(C=O)N(RO-)) have been investigated in aqueous cationic micellar media at pH 9.12 and 27 degrees C. The pseudo-first-order rate constant-surfactant profiles show micelle-assisted bimolecular reactions involving interfacial ion exchange between bulk aqueous media and micellar pseudophase. N-Substituted hydroxamate ion shows higher reactivity over the unsubstituted hydroxamate ions in cationic micellar media. The kinetic data are discussed in terms of the pseudophase ion exchange model.
authors.affiliation: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, 492010 India. kallolkghosh@yahoo.com
authors.forename: Kallol K
authors.initials: KK
authors.lastname: Ghosh
authors.forename: Daliya
authors.initials: D
authors.lastname: Sinha
authors.forename: Manmohan L
authors.initials: ML
authors.lastname: Satnami
authors.forename: D K
authors.initials: DK
authors.lastname: Dubey
authors.forename: P
authors.initials: P
authors.lastname: Rodriguez-Dafonte
authors.forename: G L
authors.initials: GL
authors.lastname: Mundhara
mesh_terms: D002412:Cations / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006877:Hydroxamic Acids / Q000737:chemistry*; D007700:Kinetics; D008823:Micelles; D008956:Models, Chemical; D015394:Molecular Structure; D009574:Nitro Compounds / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D010766:Phosphorylation; D013237:Stereoisomerism; D014867:Water / Q000737:chemistry
chemical_list: D002412:Cations; D006877:Hydroxamic Acids; D008823:Micelles; D009574:Nitro Compounds; D010710:Phosphates; C518259:p-nitrophenyl diphenyl phosphate; D014867:Water