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Kinetics and mechanism of reaction between zirconium‐lactate and pentane‐2,4‐dione in excess lactate
Author(s) -
Ghosh Rozi,
Banerjee Rupendranath,
Sarkar Diptabhas
Publication year - 2011
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20578
Subject(s) - chemistry , pentane , kinetics , reactivity (psychology) , zirconium , medicinal chemistry , tautomer , reaction rate constant , equilibrium constant , reaction mechanism , catalysis , chemical kinetics , enol , inorganic chemistry , organic chemistry , medicine , physics , alternative medicine , pathology , quantum mechanics
The kinetics of the reaction of pentane‐2,4‐dione (HA) with Zr IV has been studied at 25.0°C in an excess lactate (L − ) media. The equilibrium reaction was found to be: Zr 2 L 6 +HA⇌HL+Zr 2 AL 5 . The equilibrium was approached from either direction and a plausible mechanism has been proposed with kinetic constants, but individual reactivities of the keto and the enol tautomers of pentane‐2,4‐dione could not be apportioned. However, it was found that both the uncatalyzed and acid‐catalyzed paths contribute to the reverse reaction. But 2‐thenoyltrifluoroacetone (HT) forms a stronger chelate with Zr IV , so its reaction with less reactive Zr 2 L 5 (OH 2 ) 2 +could not be detected; reactivity of the more reactive Zr 2 L 5 (OH 2 )(OH) could be found. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 725–729, 2011