544693-72-3Relevant academic research and scientific papers
Monocyclopentadienyl complexes of niobium, tantalum and tungsten containing heterodifunctional P,O ligands
Morise, Xavier,Green, Malcolm L. H.,Braunstein, Pierre,Rees, Leigh H.,Vei, Ino C.
, p. 32 - 38 (2003)
The reactions of P,O type ligands with the half-sandwich complexes [(η-C5R5)MCl4] (R5 = H5, Me5, iPrH4; M = Nb, Ta, W) have been investigated. Monodentate P-adducts were obtained with the β-amidophosphine Ph2PCH2C(O)NPh2, whereas in the case of the keto ligand Ph2PCH2C(O)Ph a spontaneous HCl elimination occurred to give direct access to the corresponding phosphinoenolate complexes. The crystal structures of [(η-C5H5)NbCl3{PPh2CH ---...C(---...O)Ph}], [(η-C5H5)TaCl3{PPh2CH ---...C(---...O)Ph}] and [η-C5Me5)TaCl3{PPh2CH ---...C(---...O)Ph}] have been determined. Interestingly, the acetamido derived phosphine Ph2PNHC(O)Me afforded O-adducts, which is an unusual bonding mode for a P,O ligand.
