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The oxidative decarboxylation of phenylsulfinylacetic acid (PSAA) by Cr(VI) in 20% acetonitrile − 80% water (v/v) medium follows overall second order kinetics, first order each with respect to [PSAA] and [Cr(VI)] at constant [H + ] and ionic strength. The reaction is acid catalysed, the order with respect to [H + ] is unity and the active oxidizing species is found to be HCrO3 + . The reaction mechanism involves the rate determining nucleophilic attack of sulfur atom of PSAA on chromium ofdoi:10.5012/jkcs.2014.58.1.17 fatcat:emlrif4rebczjoqimzriu47pnq