 In the last step, the Cu(III)-C bond breaks to regenerate the Cu(I) catalyst while the triflate ion abstract the meta-hydrogen to recover the aromaticity and gives the product.In 2012, Yu and co-workers reported a pioneering "meta"-selective C-H olefination using nitrile-containing templates to deliver the palladium to the "meta"-position via a macrocyclic cyclophane-like pre-transition state.The nitrile group is tethered to the aromatic ring by a removable linker.