In addition to the support of the proposed mechanism, we have done some of the controlled experiments to confirm the path of the reaction. Interestingly, the oxidation of disul-fide 3d using IBX in optimized reaction protocol offered excellent yield of the product 2d, Scheme 4a. In order to prove that the reduced product of IBX, i.e., IBA, is capable to perform the oxidation, thiol 1b was treated with 2 and 4 equiv of IBA. After 24h, the reactions afforded thiosulfonate 2b in >90 isolated yields, While reaction with 4.0 equivalents oxidant gave 2b quantitatively, small amount of disulfide 3b (~510%) was obtained for reaction with 2.0 equiv IBX produced Scheme 4b.