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Additionally,cleaner protocols under solvent-free conditions were described.These methods use N-phenyltriazolinedione,pyridinium chlorochromate,1,3-dibromo-5,5-dimethylhydantoin, SO2Cl2,trichloronitromethane, KMnO4/MnO2,6e KMnO4 supported onmontmorillonite K10,catalyticamountofiodine,andCeCl37H2Oin graphite,6g and KF/Al2O3as catalysts. Thus, there is still anattention in developing green methods that would produce thedesirable disulfides in high yields.
In this way, ionic liquids (ILs) constitute an interesting alternativefor this reaction. Because product isolation or catalyst recyclingis very easy in ILs and, in some cases, rate accelerations

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