Zirconocene dichloride
From Wikipedia, the free encyclopedia
| Zirconocene dichloride | |
|---|---|
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| Identifiers | |
| CAS number | 1291-32-3  |
| PubChem | 10891641 |
| Properties | |
| Molecular formula | C10H10Cl2Zr |
| Molar mass | 292.32 g mol−1 |
| Appearance | white solid |
| Solubility in water | Soluble (Hydrolysis) |
| Hazards | |
| MSDS | CAMEO Chemicals MSDS |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Zirconocene dichloride is an organozirconium compound composed of a zirconium central atom, with two cyclopentadienyl and two chloro ligands. It is a colourless diamagnetic solid that is somewhat stable in air.
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[edit] Preparation
Zirconocene dichloride may be prepared from zirconium(IV) chloride-THF complex and sodium cyclopentadienide:
- ZrCl4(THF)2 + 2 NaCp → Cp2ZrCl2 + 2 NaCl + 2 THF
The closely related compound Cp2ZrBr2 was first described by Birmingham and Wilkinson.[1]
[edit] Reactions
Zirconocene dichloride reacts with lithium aluminium hydride to give Cp2ZrHCl Schwartz's reagent:
- (C5H5)2ZrCl2 + 1/4 LiAlH4 → (C5H5)2ZrHCl + 1/4 "LiAlCl4"
Since lithium aluminium hydride is a strong reductant, some over-reduction occurs to give the dihydrido complex, Cp2ZrH2; treatment of the product mixture converts it to Schwartz's reagent.[2]
[edit] References
- ^ G. Wilkinson and J. M. Birmingham (1954). "Bis-cyclopentadienyl Compounds of Ti, Zr, V, Nb and Ta". J. Am. Chem. Soc. 76 (17): 4281–4284. doi:10.1021/ja01646a008.
- ^ S. L. Buchwald, S. J. LaMaire, R. B. Nielsen, B. T. Watson, and S. M. King, "Schwartz's Reagent", Org. Synth., http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=CV9P0162; Coll. Vol. 9: 162
[edit] Further reading
- A. Maureen Rouhi (1998). "Organozirconium Chemistry Arrives". C&EN News 82 (16): 162. http://pubs.acs.org/cen/nlw/8216sci1.html.
