“…When iodobenzene 3a was employed, the catalytic reaction proceeded quantitativelyt oy ield 4a.T he use of electron-rich aryl iodides,s uch as p-tert-butyl-(3k), p-benzyloxy-(3l), and pmethoxy-iodoarene(3m), afforded the corresponding products (4k-m)i ne xcellent yield. In contrast, the reactions with p-iodoethylbenzoate (3n)a nd o-iodopyridine derivative (3o) proceeded sluggishly.I na ddition, the reactions with iodoarenes bearing an itro group (3p-r)p roceeded slowly,w hereasa stoichiometric treatment of 3p-r with in situ generated 2 resulted in the cleanf ormation of 4p-r. [11] In this catalytic system,t he electron-withdrawing group, especially the nitro substituent, might impede the regeneration of the key intermediates 1 and/or 2.M oreover,d iiodoarene derivatives (3s,t) could be employed as substrates for the preparation of bis-(pentafluoroethyl)arenes (4s,t), where an increased catalyst loading was required. When 2-bromo-8-iododibenzofuran (3u) was employed, 2-bromo-8-(pentafluoroethyl)dibenzofuran (4u) was obtained as the major product, albeit that trace amount of 4s were also detected duet oapentafluoroethylationo ft he C(sp 2 )ÀBr bond.…”