2: TFA / CHCl3 / 55 °C 3: hydrogen / PtO2 / ethyl acetate / 48 h / 25 °C / 760 Torr View Scheme

η5-cyclopentadienyl dicarbonyl cobalt; cesium fluoride 1.) THF, reflux, irradiation, 2.) DMSO, 79-80 deg C, 3 d; Yield given. Multistep reaction;