2-(2′-Pyridyl)phosphaferrocenes and analogues: A new type of chelating ligands with planar chirality and π-acceptor phosphorus centres

Article abstract of DOI:10.1016/S0022-328X(97)00052-1

The reaction of 1-(2′-pyridyl)-3,4-dimethylphosphole with [CpFe(CO)₂]₂ under CO pressure at 160°C affords the 2-(2′pyridyl)-3,4-dimethylphosphaferrocene (2) in 65% yield. This compound behaves as a π-acceptor-σ-donor P,N-chelating ligand towards W(O) and Cu(I). The W(CO)₄ complex 5 has been characterized by X-ray crystal structure analysis. Some strain within the chelate is obvious from the P-W-N angle of 73°. The analogous 2-(8′-quinolyl)-3,4-dimethylphosphaferrocene (10) and 2-(2′-pyridyl)-3,4-dimethylphosphacymantrene (11) are also described. 1997 Elsevier Science S.A.