The kinetics of the reaction of substituted anilines with 2-chloro-5-nitropyridine were studied in dimethyl sulfoxide (DMSO) and dimethyl formamide (DMF) at different amine concentrations and temperatures in the range 45-60 • C. In both solvents the reaction was not a base-catalyzed one. A plot of H # versus S # for the reaction in DMSO and DMF gave good straight lines with isokinetic temperatures 128 • C and 105 • C, respectively. Good linear relationships were obtained from the plots of log k 1 against σ • values at all temperatures with negative ρ values (−1.63 to −1.28 in DMSO) and (−1.26 to −0.90

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