A Mild Carbon-Boron Bond Formation from Diaryliodonium Salts

The direct metal-free borylation of diaryliodonium salts with diboron reagents is now demonstrated to be a feasible process toward aryl boronic esters formation without any additive or catalysts, and it can be extended to a two-step C-C coupling of both aryl groups of the initial diaryliodonium reagent.