T. Brackemeyer et al., SYNTHESIS AND STRUCTURE OF DONOR-LIGAND-STABILIZED TRIS(CYCLOPENTADIENYL)ZIRCONIUM CATIONS, Organometallics, 16(4), 1997, pp. 531-536
Treatment of Cp(2)Zr(Cl)CH3 (6) with;sodium cyclopentadienide gives Cp
(3)ZrCH(3) (7). Its reaction with dimethylanilinium tetraphenylborate
yields the Cp(3)Zr(THF)(+) cation. [CP3Zr+CH3B(C6F5)(3)(-)] (9) is gen
erated by treatment of 7 with tris(pentafluorophenyl)borate. Nitriles
add to 9 to form the ligand-stabilized tris(eta 5-cyclopentadienyl)zir
conium cation systems Cp(3)Zr(N=CR)(+). With tert-butyl isocyanide, 9
is transformed to yield the donor-ligand-stabilized [Cp(3)Zr(C=NCMe)(3
)(CH3B)-C-+(C3F5)(3)(-)] salt 12. Carbon monoxide adds to 9 to give th
e cationic metal carbonyl complex [Cp(3)Zr(CO)(CH3B)-C-+(C6F5)(3)(-)]
(13). Both cation complexes 12 and 13 were characterized by X-ray diff
raction.