Ion-exchange extractive alkylation of organic acids

Rate of dibutylsulfide decomposition by ozonation and the O3/H2O2 advanced oxidation process

“…Assuming that oxidation of sulfide side chains (paths 2, 3 and 4) leads to creation of acids, we verified which acids are synthesized during ozonation of DBS in water. For this purpose sample of DBS in water-acetone solution was ozonized for 1 h. In the next step all acids were separated in ion-exchange column, and later derivatized according to the procedure described by Verner [30].Results of chromatographic analysis of derivatized acids were presented in Fig. 6.…”

“…After 1 h of ozonation of DBS solution, collected samples were derivatized in ion-exchange column, according to procedure described by Verner [30]. In our research ion-exchange resin Dowex ® 1 × 2 was used as an ion-exchanger.…”

“…In our research ion-exchange resin Dowex ® 1 × 2 was used as an ion-exchanger. All acids collected in ion-exchange column were derivatized using mixture of acetonitrile and ethyl iodide (instead of acetone/methyl iodide as applied in [30]). …”

Investigation of DBS electro-oxidation reaction in the aqueous-organic solution of LiClO4

“…In order to transform resulting acids (products of electrochemical DBS oxidation in aqueous-organic environment) into esters, samples were derivatized on an ion-exchange column, according to the procedure described elsewhere [24]. The ion-exchange resin Dowex ® 1 × 2 was used as an ion-exchanger, and acids retained in the column were esterificated with the acetonitrile-ethyl iodide mixture.…”

Sample Preparation for Chromatographic Analysis

“…In the poorly solvating organic medium, the substrate anion possesses high reactivity and the nucleophilic displacement reaction with an alkyl halide occurs under favorable conditions. Isolation by anion-exchange chromatography with in situ alkylation of the anion attached to the anion exchanger has been suggested as an alternative to extractive alkylation using an ion pair reagent [504]. The choice of cation depends on the efficiency with which the ion pair will extract from aqueous solution and then undergo alkylation.…”