Pd-Catalyzed Hydroboration of Vinylarenes with B₂pin

A palladium­(II)-catalyzed Markovnikov hydroboration of aryl alkenes with readily available bis­(pinacolato)­diboron (B₂pin₂) is reported. The reaction proceeded with low catalyst loading (0.5 mol %) in the absence of N- or P-containing ligands, affording the products in up to 90% yield. Trifluoracetic acid serves as the hydrogen source, enabling the synthesis of benzylic boronic esters under mild ambient conditions.