2.1.1.2. Reaction in aprotic media. K+[HFe(CO)4]− does not react significantly
with PPh3 in THF at room temperature, in agreement with the observation of
Collman about Na+[HFe(CO)4]− [20]. However, in refluxing THF, a gas evolution is observed with precipitation of the THF-insoluble K2Fe(CO)4 (Eq. (8)).
2K+[HFe(CO)4]−+2PPh3 CCA THF, reflux
−CO, −H2
3K2Fe(CO)4+Fe(CO)3(PPh3)2 (8)