In this kinetic study of the reaction between the iodide ion and the Nchlorosuccinimide, we have found that the reaction is first order in N-chlorosuccinimide: namely, first order with respect to the iodide ion and first order with respect to the proton concentration. Based on the experimental results, we propose a mechanism consistent in Cl + transfer from the N-chlorosuccinimide to the iodide ion. We have found that the reaction presents general acid catalysis with a Brönsted exponent value of 0.10. In addition, given that the N-chlorocompounds are not stable in aqueous solution, we have carried out a study on the influence of bases in the presence of N-chlorosuccinimide. We have found that the reaction is first order in hydroxide ion, as well as in the 1,1,1,3,3,3-hexafluoroisopropanoxide ion and the 2,2,2-trifluorethoxide ion, which shows that the reaction is general-base catalyzed. C 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: [243][244][245][246][247][248][249][250][251][252] 2005