The palladium-catalyzedarylation of alpha,alpha-disubstituted arylmethanols with aryl halides proceeds not only via C-H bondcleavage at the ortho-position, but also via cleavage of the sp(2)-sp(3) C-C bond with the liberation of ketones (beta-carbon elimination) to give the corresponding biaryls. Both reactions appear to occur through common arylpalladium(II) alcoholate intermediates. The results
α-Functionalization of alkyl boronicesters and homologation of aryl boronicesters by regioselective radical C(sp3)–H activation in boron-ate complexes is reported. Reaction of commercial or readily accessed aryl boronic acid pinacol esters with alkyl lithium reagents provides boron-ate complexes. Selective α-C–H abstraction by in situgenerated trifluoromethyl radicals leads to radical anions that