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wedecided to use it embedded on silica-gel for the productionof sulfones via direct sulfonylation of aromatic rings.Preparation of symmetric and unsymmetric aromaticsulfones was achieved in moderate to good yields (50-95%)via Friedel-Crafts type sulfonylation of arenes with varioussulfonic acids (Scheme 1). P

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An Efficient Method for the Sulfonylation of Aromatic Rings with Arene/Alkane Sulfonic Acid by Using P2O5/SiO2under Heterogeneous Conditions