Fig. 7. IR spectroscopic monitoring using a Harrick cell of the reaction of 4Mes under an atmosphere of CO in toluene over 8 days. Orange circles highlight the signals for 4Mes, red circles highlight the signals for 2Mes. Black circles highlight the signals for Fe(CO)5. The green circle highlights the signal for 8. The purple circle highlights a signal attributed to a proposed Fe–ketenyl complex, 9 (see Fig. 8 for proposed structure). See ESI‡ for a zoom in of the region between 2150–2075 cm−1.
