The titanocene dicarbonyl dication [TiCp2(CO)2][BPh4]2, (1) has been obtained in toluene under carbon monoxide by double protonation of TiCp4 with [NHnBu3][BPh4] or by two-electron oxidation of TiCp2(CO)2 with [FeCp2][BPh4]. Protonation reactions on ZrCp4 and HfCp4 proceed with elimination of 1 mol of cyclopentadiene independently on the ammonium salt:MCp4 molar ratio used. By this route the high electrophilic, solvent-free [ZrCp3] cation has been isolated and characterized by IR, 1H-NMR and elemental analysis. In the case of hafnium, the isolation has not been possible; nevertheless, in the presence of CO a rare example of a carbonyl derivative of hafnium(IV), [HfCp3(CO)][BPh4], has been isolated and characterized.

Carbon Monoxide and Tertiary Phosphines as Ligands in Cyclopentadienyl Derivatives of Group 4 Elements in High Oxidation State

PAMPALONI, GUIDO;
2000-01-01

Abstract

The titanocene dicarbonyl dication [TiCp2(CO)2][BPh4]2, (1) has been obtained in toluene under carbon monoxide by double protonation of TiCp4 with [NHnBu3][BPh4] or by two-electron oxidation of TiCp2(CO)2 with [FeCp2][BPh4]. Protonation reactions on ZrCp4 and HfCp4 proceed with elimination of 1 mol of cyclopentadiene independently on the ammonium salt:MCp4 molar ratio used. By this route the high electrophilic, solvent-free [ZrCp3] cation has been isolated and characterized by IR, 1H-NMR and elemental analysis. In the case of hafnium, the isolation has not been possible; nevertheless, in the presence of CO a rare example of a carbonyl derivative of hafnium(IV), [HfCp3(CO)][BPh4], has been isolated and characterized.
2000
Pampaloni, Guido; G., Tripepi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/169419
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