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      • KCI등재

        Selective heteroaromatic nitrogen base promoted chromium(VI) oxidation of isomeric pentanols in aqueous micellar media at room temperature

        Pintu Sar,Bidyut Saha,Aniruddha Ghosh,Susanta Malik,Dhiman Ray,Bijan Das 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-

        Oxidation of the three isomeric pentanols by potassium dichromate in aqueous acidic medium wasinvestigated spectrophotometrically at 25 C. The oxidation leads to the formation of correspondingcarbonyl products as identified by 1H NMR measurement and other techniques. The effects of cationic(cetylpyridinium chloride, CPCl), anionic (sodium dodecylsulphate, NaDS) and nonionic surfactant(polyoxyethylene octyl phenyl ether, TX-100) on reaction kinetics were studied. Moreover the catalyticeffect of surfactant in presence of three heteroaromatic nitrogen bases: 2-picolinic acid (2-PA), 2,20-bipyridyl (2,20-bipy) and 1,10-phenanthroline (1,10-phen) on the oxidation were also investigated. Thevalue of the rate constant in promoted and unpromoted reaction has been found to be higher in NaDSthan in TX-100 and CPCl micellar medium. Conductivity and tensiometry measurements were carried outto determine critical micellization concentration and free energy of micellization (DGm) of the usedsurfactant in presence of three pentanols. Among the different surfactant and promoter the combinationof 2,20-bipy and NaDS is efficient to exhibit1000 fold rate enhancement for oxidation of 1-pentanol andit is ‘selective’ over the rest of two pentanols oxidation.

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