Complex tantalum phosphinidene

Figure 6.6 Illustration of the phosphinidene complex ll(MciSiN)jN Ta — PCy]. Tantalum and nitrogen atoms are shown as black spheres, silicon and phosphorus atoms are grey and carbon atoms are indicated in white shadow. The Ta=P bond length is 2. ISA...

Formation of this complex may occur via an initial formation of a low-valent tantalum intermediate which oxidatively adds one terminal P-Cph bond to the metal centre resulting in transfer of the phenyl ligand to the metal and formation of complex 42. The P NMR spectrum of the reaction mixture showed formation of a mixture of cyclooligophosphanes, the phosphinidene-bridged complex [ Ta( -C5Me5)Cl( U-PPh) 2] as well as numerous low-intensity multiplets which could not... 

Hadi GAA, Fromm K, Blaurock S, Jelonek S, Hey-Hawkins E (1997) Organometallic tantalum complexes with phosphine, phosphanido and phosphinidene ligands. Syntheses... 

---