Aspects of carbonyltantalum chemistry

Synthesis and Properties of the 17-Electron, Tantalum-Centered Radical Ta(CO)4(Ph2PCH2CH2PPh2)

“…The lithium naphthalenide reduction procedure was therefore chosen for this work, and yields of ∼15% were obtained. Although these yields do not correspond to the reported yield, our results are in agreement with those of Rehder et al ., who obtained yields of 15% using lithium naphthalenide. Following a later report by Ellis et al for the synthesis of [M(CO) 6 ] 2- (M = Ti, Zr, Hf), we used sodium naphthalenide.…”

Niobium and Tantalum

“…70 while the tantalum analogue Cp* 2 TaCl 2 must be prepared from Cp*TaCl 3 (PMe 3 ) and KCp*. 282 This latter reaction has allowed the facile preparation of mixed-ligand compounds as indicated in Equation (24). 282 Other d x mixed Cp complexes (e.g., (r|-C 5 H 4 R)Cp'NbCl 2 for R = Bu l or CHMePh) have been prepared by adding one rj-C 5 H 4 R ligand to NbCl 5 (in heptane) using Bu n 3 Sn(C 5 H 4 R), followed by in situ reduction to Nb IV and metathesis with Li(C 5 H 4 R).…”

“…• Cp*CpTaCl 2 + PMe 3 + NaCl (24) An interesting series of formal mixed-valence M m -M IV compounds Cp 4 M 2 Cl 3 have been reported. The NaHg reduction of Cp 2 NbCl 2 (a THF suspension) for short periods of time (-30 min) affords a purple compound upon evaporating the solution to dry ness.…”