“…Greaney [15] recently disclosed photo-induced ruthenium-catalyzed remote C À Ha lkylations.A fter submission of the present manuscript, Greaney has reported on ar utheniumcatalyzed arylation of phenylpyridines using visible light, which was proposed to occur by an oxidative addition/ reductive elimination process. [16] Within our program on sustainable CÀHa ctivation, [17] we have now devised the first light-driven ruthenium-catalyzed CÀHa rylations at ambient temperature (Figure 1c). Notable features of our strategy include (i)a versatile dual-functional ruthenium(II) biscarboxylate catalyst for selective direct arylations,( ii)visiblelight-induced CÀHa ctivation, (iii)photocatalysts-free ambient temperature transformations,( iv) versatile CÀHa rylations on transformable arenes and biorelevant purines,a nd (v) mechanistic insights by experiment and computation, being supportive of ar uthenium(II/III/IV) mechanism.…”