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Kinetics and mechanism of reaction between zirconium-lactate and pentane-2,4-dione in excess lactate

✍ Scribed by Rozi Ghosh; Rupendranath Banerjee; Diptabhas Sarkar

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
181 KB
Volume
43
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetics of the reaction of pentane-2,4-dione (HA) with Zr IV has been studied at 25.0 β€’ C in an excess lactate (L -) media. The equilibrium reaction was found to be:

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.

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