A process for the oxidation of thioethers to sulfoxides or sulfones or for the oxidation of sulfoxides to sulfones by treatment of thioethers or sulfoxides with an oxidizing amount of -phthalimidoperhexanoic acid is particularly useful for the preparation of compounds of industrial interest, in particular pharmaceuticals for human or veterinary use.

 
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> Triaryl-oxy-aryloxy-pyrimidine-2,4,6-trione metalloproteinase inhibitors
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