Polyureas derived from CO2 and diamines: highly efficient catalysts for C-H arylation of benzene

Polyureas derived from CO2 and diamines were effective for C-H arylation of benzene in the presence of t-BuOK, producing biaryl products with various substituents in high yields up to 97%. Dual-activation of K+ and t-BuO-, and pi,pi-stacking interaction between the substrate and the polymer backbone may account for the superior activity.