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Direct C–H arylation of unactivated benzene with aryl halides under various simple ligands (EDA, DMEDA, ethylene glycol, etc.) in the presence of potassium tert-amylate (t-AmOK) base at mild temperature (80 °C) have been developed. This transition-metal-free radical cross-coupling offers an efficient way to synthesize various biaryls in good yields through base-promoted homolytic aromatic substitution...
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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