Iron-catalyzed selective biaryl coupling: Remarkable suppression of homocoupling by the fluoride anion

In the presence of iron(III) fluoride and 1,3-bis(2,6-di-i-propylphenyl)imidazolinium chloride, aryl magnesium bromides react with aryl chlorides to give the corresponding cross-coupling products, unsymmetrical biaryls, in good to excellent yields.