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)5P(p-tol)3(1+) in THF under Ar at 22°C, react. time <5 min; not isolated; monitored by IR;

1: tetrahydrofuran View Scheme