Nucleophilic dephosphorylation of p-nitrophenyl diphenyl phosphate in cationic micellar media.
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.
Ghosh
Kallol K
KK
School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, 492010 India. kallolkghosh@yahoo.com
Sinha
Daliya
D
Satnami
Manmohan L
ML
Dubey
D K
DK
Rodriguez-Dafonte
P
P
Mundhara
G L
GL
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
D002412:Cations; D006877:Hydroxamic Acids; D008823:Micelles; D009574:Nitro Compounds; D010710:Phosphates; C518259:p-nitrophenyl diphenyl phosphate; D014867:Water