| Autor: |
Buzin, F.-X., Nief, F., Ricard, L., Mathey, F. |
| Zdroj: |
Organometallics; January 2002, Vol. 21 Issue: 2 p259-263, 5p |
| Abstrakt: |
The reduction of [(η5-C4Me4P)2ZrCl2] (1) by magnesium in THF affords a transient octamethyl-1,1-diphosphazirconocene which can be trapped by CO, bis(trimethylsilyl)acetylene, and 2-butyne to give the corresponding dicarbonyl 2, zirconacyclopropene 3, and zirconacyclopentadiene 4; all of these products have been characterized by X-ray analyses. An assessment of the π-basicity of the η5-C4Me4P ligand has been made by several methods: (a) a comparison of the IR carbonyl stretching frequencies of 2 and of other dicarbonylzirconocene complexes, (b) a correlation of the 13C NMR and IR data in 3 and in similar zirconacyclopropenes, and (c) an electrochemical study on 1. All these experiments confirm that the η5-C4Me4P ligand is a poorer π-base than the Cp ligand. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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