Abstract
A green and efficient method for chemoselective oxidation of aromatic thiols to the corresponding disulfides is reported using a recoverable supported iron oxide nanoparticle (γ-Fe2O3–SO3H) catalyst in the presence H2O2 as the oxidant and methanol as the solvent at room temperature. This reaction is operationally simple with an easy work-up, utilizes mild reaction conditions, is high-yielding, clean, and exhibits high selectivity toward aromatic disulfides with no side reactions. The supported iron oxide nanoparticles can be easily recovered using an external magnet from the reaction mixture and reused several times. Reaction progress was monitored by potentiometric titration.
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