Abstract
Simple and cheap potassium ethoxide (EtOK) and a catalytic amount of phenanthroline can efficiently promote the direct C–H arylation of unactivated arenes with aryl iodides at 80 °C. This transition-metal-free base-promoted homolytic aromatic substitution offers a chemoselective approach to synthesize biaryls bearing active halo substituents (I, Br, Cl, etc.) in good yields.
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