[Figure 4]
The cation exchange resins Amberlite IR-120(H) (entry 1), IRN-150 (entry 2), Dowex Monosphere 650C (entry 3) and Dowex Marathon MSC (entry 4) remove the reactants relatively similarly, while a stronger adsorption of the product and the substrate can be recognized with respect to an increase of the ion exchanger’s doses. All cation exchange resins used in this study are composed of a styrene/divinylbenzene-based matrix with sulfonic acid moieties (Figure 5).