Reactivity patterns associated with pyramidal and planar phosphido-ligand geometries; synthesis and structure of [Os(PHPh)Cl(CO)2(PPh3)2] and of [Os{PH(OMe)Ph}(CO)2(PPh3)2]
Abstract
Deprotonation of [OsCl(PH2Ph)(CO)2(PPh3)2]+ gives the terminal phosphido-complex, [Os(PHPh)Cl(CO)2(PPh3)2], which has pyramidal geometry at P and associated nucleophilic properties, e.g., protonation and methylation at P, but [Os(PHPh)Cl(CO)2(PPh3)2] also reacts with methoxide to form the zerovalent compound [Os{PH(Ome)Ph}(CO)2(PPh3)2] suggesting the intermediacy of the planar phosphido-complex [Os(PHPh)(CO)2(PPh3)2]+.