Effects of urea, Na+ and Li+ ions on the kinetics and mechanism of intramolecular general base-catalyzed glycolysm of ionized phenyl salicylate in ethane-1,2-diol–acetonitrile solvents at a constant water concentration
✍ Scribed by M. Niyaz Khan
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 120 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0894-3230
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✦ Synopsis
Pseudo-first-order rate constants (k 1 ) for the reaction of ethane-1,2-diol (DOL) with ionized phenyl salicylate (PS À ), obtained in mixed DOL-CH 3 CN solvent at constant [H 2 O] and [NaOH], obey the relationship
, where a is the apparent second-order rate constant, K A is the association constant for the dimerization of DOL and [DOL] T is the total concentration of DOL. The values of K A , in the presence of Na ions, decrease with increase in [H 2 O]. Lithium ions cause almost complete depolymerization of polymeric DOL (i.e. K A % 0) under the experimental conditions imposed. The effect of 0.5 M urea on the structural behavior of the mixed solvent is kinetically insignificant.