V(CO)6 reacts with sources of the cyclopentadienyl anion to give the orange four-legged piano stool complex (C5H5)V(CO)4 (m.p. 136 °C).
The reaction between V(CO)6 and cyclopentadienyl anions results in the formation of an orange four-legged piano stool complex with a melting point of 136°C.