tetrahydrofuran in tetrahydrofuran addn. of 5 mL of 1E-2 M Mn(CO)5(1-) in THF to 5 mL of 1E-2 M Mn(CO)5PPh2Et(1+) in THF under Ar at 22°C, react. time 30 min; not isolated; detected by IR and TLC;

1: tetrahydrofuran View Scheme