Abstract
The oxidation of caffeine by sodium N-chloro benzene sulphonamide (Chloramine-B, CAB) in HCl (0.02–0.10 M) over the temperature range 303–323 K shows first order dependence on [CAB], fractional orders in [H +] and [Cl -] and is independent of substrate concentration, ionic strength. Addition of the reaction product benzene sulphonamide have no influence on the reaction rate, which increases in D 2O a value of 1.41 for the inverse solvent isotope effect. On decreasing the dielectric constant of the medium by adding t-butanol, the rate decreases slightly. The kinetic data suggest a complex formation between RNCl - and HCl. Thermodyanamic parameters are evaluated. Rate expression and probable mechanism for the observed kinetics have been suggested.
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