#alpha#-Stabilized phosphoylides as versatile multifunctional ligands

摘要

The coordination properties of #alpha#-stabilized phosphorus ylides show that these compounds can behave as ambidentate ligands towards palladium (II) complexes. Bonding through the carbon atom or through the heteroatom (O, N) and the coordination site can be conditioned by adequate choice of the organometallic precursor. On the other hand, the bis-ylide Ph_3P=C(H)-C(O)-C(H)=PPh_3 coordinates as a C, C-chelating ligand towards Pd(II) complexes and it can undergo an intramolecular orthometallation in different ways, leading to substrates that are adequate for the synthesis of polynuclear derivatives with or without a metal-metal bond.