Reaction of (η 5 ‐C 5 H 5 )Fe(CO) 2 I with Anionic Bidentate Phosphine Ligands PPh 2 ( o ‐C 6 H 4 NHLi) or PPh 2 ( o ‐C 6 H 4 OLi)

The o ‐substituted hybrid phenylphosphines, PPh 2 ( o ‐C 6 H 4 NH 2 ) and PPh 2 ( o ‐C 6 H 4 OH), could be deprotonated with LDA or n ‐BuLi to yield PPh 2 ( o ‐C 6 H 4 NHLi) and PPh 2 ( o ‐C 6 H 4 OLi), respectively. When added to a solution of (η 5 ‐C 5 H 5 )Fe(CO) 2 I at room temperature, these two lithiated reagents produce a chelated neutral complex 1 (η 5 ‐C 5 H 5 )Fe(CO)[C(O)NH( o ‐C 6 H 4 )PPh 2 ‐ C,P ‐η 2 ] for the former and mainly a zwitterionic complex 2 , (η 5 ‐C 5 H 5 )Fe + (CO) 2 [PPh 2 ( o ‐C 6 H 4 O − )] for the latter. Complex 1 could easily be protonated and then decarbonylated to give 4 [(η 5 ‐C 5 H 5 )Fe(CO){NH 2 ( o ‐C 6 H 4 )PPh 2 ‐ N,P ‐η 2 } + ]. Complexes 1 and 4‐I have been crystallographically characterized with X‐ray diffraction.