Hafnocene dichloride explained
Hafnocene dichloride is the organohafnium compound with the formula . It is a white solid that is sparingly soluble in some organic solvents. The lighter homologues zirconacene dichloride and titanocene dichloride have received much more attention. While hafnocene is only of academic interest, some more soluble derivatives are precatalysts for olefin polymerization. Moreso than the Zr analogue, this compound is highly resistant to reduction.
It is prepared by a salt metathesis reaction from hafnium tetrachloride by salt metathesis:
Derivatives
Hydrolysis gives the trimer .[1]
The chloride ligands can be replaced by other halides.[2]
The bis(phosphide) can be prepared by salt metathesis from hafnocene dichloride.[3]
References
- 10.1007/BF01195715 . Synthesis and Crystal Structure of [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>HfO]3C6H5Me . 1982 . Rogers . Robin D. . Vann Bynum . R. . Atwood . Jerry L. . Journal of Crystallographic and Spectroscopic Research . 12 . 3 . 239–244 . 97164127 .
- 10.1039/J19690002106 . Metallocene Halides. Part I. Synthesis, Spectra, and Redistribution Equilibria of di-π-Cyclopentadienyldihalogeno-Titanium(IV),-Zirconium-(IV), and -Hafnium(IV) . 1969 . Druce . P. M. . Kingston . B. M. . Lappert . M. F. . Spalding . T. R. . Srivastava . R. C. . J. Chem. Soc. A . 2106–2110.
- 10.1021/om50002a022 . Characterization and Interconversion of Metal-Phosphorus Single and Double bonds: Bis(cyclopentadienyl)zirconium and -Hafnium Bis(diorganophosphide) Complexes . 1983 . Baker . R. T. . Whitney . J. F. . Wreford . S. S. . Organometallics . 2 . 8 . 1049–1051.
