Catalytic Trifluoromethylation of Aryl‐ and Vinylboronic Acids by 2‐Cyclopropyl‐1‐(trifluoromethyl)benzo[b]thiophenium Triflate.

Aryl, hetaryl, and alkenyl boronic acids are successfully trifluoromethylated in varying yields, depending on the elctronic and steric properties of the substituents.