The electron transfer reaction of Cr(VI) with organic sulfides is facilitated by added pyridine bases 2,2¢-bipyridine, 1,10-phenanthroline, picolinic acid and pyridine 2,6-dicarboxylic acid. The added base forms a Cr(VI)-base adduct carrying positive charge which acts as a more reactive oxidant compared to Cr(VI). UV-Visible spectrophotometric study provides evidence for the formation of Cr(V) as the intermediate. The reactions in the absence and presence of pyridine bases follow the reactivity-selectivity principle.
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