Ru@C as a safety mask of RuO4@C for selective catalytic oxidation of alkynyl sulfurs to prepare alkynylsulfones

A high‐performance catalyst, RuO 4 @C, was safely generated in situ from a safety mask Ru@C, which was recyclable and commercially available. The catalyst could selectively oxidize thioethers to sulfones in 95%–99% yields and alkynyl sulfurs to alkynylsulfones in 93%–98% yields. This safe, non‐toxic, inexpensive, and readily available catalyst is potentially promising for industrial applications in the production of sulfones from sulfur oxidation.