“…On the other hand, during irradiation, loss of CO from the coordination sphere was observed (with and without organic substrate), confirmed by IR spectroscopy. It has been previously proposed, that photolysis of [RhCl(CO)(PR 3 ) 2 ] (PR 3 ¼ PMe 3 and PPh 3 ) at the beginning of the catalytic cycle leads to active [RhCl(PR 3 ) 2 ], however loss of H 2 might be also photochemically driven [10,29]. Because of high activity of rhodium species formed during irradiation, it was difficult to isolate it from reaction mixture for next run of catalysis.…”