p-Iodobenzene sulfonic acid labelled with S35 or I131 and unlabelled p-iodobenzene sulfonic anhydride in a homogeneous solution of nitromethane were observed to exchange radioactivity. The kinetics correspond to a typical first order scheme. The rate constant of the first-order reaction is proportional to the ratio of the anhydride concentration to the acid concentration. The experimental data support the assumption that the exchange proceeds through a mechanism involving dissociation of a molecule of anhydride into a sulfonyl cation and a sulfonate anion.
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Christensen et al. (1963) studied this question.