Transition‐Metal‐Catalyzed Carboxylation of CH Bonds

CO2 in a fix: Gold and copper complexes of N-heterocyclic carbenes recently enabled efficient direct carboxylation of (hetero)arenes having moderately acidic CH bonds under remarkably mild reaction conditions (IPr=1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene).