“…We have therefore designed a ligand system based on pyrrolide anions containing an additional hemilabile π unit 6c. In fact, the pyrrolide anions are isoelectronic with the cyclopentadienyl anions that have produced a number of dinitrogen complexes,1c,d,e,h,m,l,p, 13 including examples that facilitate dinitrogen reduction 1c,d,e,h,m,l,p. By reducing a trivalent titanium complex of the 2,5‐{(C 4 H 3 N)CPh 2 } 2 C 4 H 2 N(Me) dianion, we recently obtained a toluene mixed‐valence complex with inverted sandwich structure, which is an example of olefin coordination 14.…”