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Where are you now

Where are you now

Selective aerobic oxidation of thiol to disulfides without any over oxidized products is studied usingcryptomelane type. Manganese oxides (K-OMS-2) with a tunnel structure as catalysts. Using K-OMS-2prepared by different, synthetic procedures. Complete conversion was obtained under air atmospherewithout generating any overoxidized products. K-OMS-2 prepared by solvent. Free method (K-OMS-2SF) with the highest surface area (155 edge 1 m2 / g), gave complete conversion while materials prepared usinghydrothermal. Method (K-OMS-2HY) with the lowest surface area (44 edge 1 m2 / g) gave only 18% conversionat room temperature. Selective poisoning. Of the acid sites suggests that Lewis acid sites are the dominatingactive site during the reaction. Effects of surface area. Of the, polarity catalyst solvent, effect catalyst substrate, recyclability and temperature were studied. The catalyst could. Be recovered in the active formafter the reaction without significant structural changes. The characterization of the catalyst. Using XRD SEM TGA,,,,, BET TEM and FT-IR are reported. The process developed is environmentally benign and isindeed heterogeneous.