Science of Synthesis

Negishi, E.-i.; Takahashi, T., Science of Synthesis, (2003) 2, 693.

The great majority of zirconocene and hafnocene derivatives are prepared from dichloro­bis(η5-cyclopentadienyl)zirconium and -hafnium, respectively (‌Scheme 17‌).[‌10‌] They, in turn, are prepared by the reaction of zirconium(IV) and hafnium(IV) chloride with a metal cyclopentadienide, where the metal is usually an alkali metal, such as lithium, sodium, or potassium, e.g. formation of ‌41‌ (‌Scheme 18‌).[‌10‌] Although dibromobis(η5-cyclopentadienyl)- or bis(η5-cyclopentadienyl)diiodometal complexes of zirconium and hafnium can be similarly prepared from the corresponding metal(IV) bromide or iodide, respectively, it may be more convenient and economical to prepare these derivatives from the dichloro­bis(η5-cyclopentadienyl)metal complexes, e.g. formation of ‌42‌ and ‌43‌, respectively (‌Scheme 19‌).[‌10‌]

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‌Meeeee 88‌ Meeeeeeeeee(η8-eeeeeeeeeeeeeeee)eeeeeee eee eee Meeeeeee ee Meeeeee(MM) Meeeeeee eeee Meeeee Meeeeeeeeeeeeeeee[‌88‌]

‌Meeeee 88‌ Meeeeeeeee(η8-eeeeeeeeeeeeeeee)eeeee eee Mee(η8-eeeeeeeeeeeeeeee)eeeeeeeeeee Meeeeeeee eeee eee Meeeeeee Meeeeeeeeee eee e Meeee Meeeeeeee[‌88‌]

Meeee eeeeeeeeeeeeeeee-eeeeeeeeee eeeeeeee, eeee ee eeeeeeeeeeeeeeeeeeeeeeeee eeeeeee[‌8‌,‌88‌] eee eeee eeeeeeeeeeeeeee eeeeee eeee ee eeeeeeeeeee eeee eeeeeeeeeeee ee eeeeeee eeee,[‌8‌] eee eeee ee eeee. Mee eeeeeee, eee eeeeeeee ee eeeeee eeeeeeeee eeeeeeeeeeeeeeeee eeee eeeeeeeee(MM) eeeeee eeeee eee(η8-eeeeeeeeeeeeeeee)eeeeeeeeeeeeeee ee eeee eeeee,[‌88‌] eee eee eeeeeeee ee eee(η8-eeeeeeeeeeeeeeee)eee(eeeeeeeeeeeee)eeeeeeeee ee eeeeeee eeeeeeeee eeee eeeeeeeeeeeeeeeeeeeeeee ee e eeeeeeeeee eeeeee eee eee eeeeeeeeeee ee eee eeeeeeeeeeeee eee(η8-eeeeeeeeeeeeeeee)eeeeeeeeeeeee(MM) eeeeeeeee.[‌88‌]

Meeeeeeeeeee Meeeeeeee

Meeeeeeeeee(η8-eeeeeeeeeeeeeeee)eeeeeee (‌88‌); Meeeeee Meeeeeeee:[‌88‌]

Meeeeeeeeeeeeeeee (888 e, 8.8 eee) eee eeeeeee ee 888°M ee e 888-eM eeeee. Mee eeeeeee eee eeeeeeeee eeeeeeee eeee e eeeeeeeeee ee eeeeee eeeeeee Me (88.8 e, 8.8 eee) ee MMM (888 eM). Mee eeeeeeeeee eee eeee eeeeeee eeeee eee eee Me eee eeeeeeeee. MMM (eeeeeeeeee ee eeeeeeee eee eeee, eeeee eeeeeeeeeee) eee eeeee ee eee eeeeeee eeee eeeeee eee eee eeeeeeeee eeee eee eeeee eeeeeeee eeee e eeeeee ee 8 e ee e eeeeeeeeee eeeeeee eeeeeeeeee ee MeMe8 (88.8 e, 8.88 eee) ee eeeeeee (MMMMMMM: Meeeeeeeee!)/MMM (8:8, 888 eM) ee 88°M. Mee eeee eee eeee eeeeeeee eee 8 e, eee eeeeeeee eeee eeeeeee, eee eee eeeeeee eee eeeeeeee ee 888°M/8.88 Meee ee eeee eee eeeeeee; eeeee: 88 e (88%).

Meeeeeeeee(η8-eeeeeeeeeeeeeeee)eeeeeee(MM) (‌88‌, M = Me); Meeeeee Meeeeeeee:[‌88‌]

MMe8 (8.88 e, 8.8 eeee) ee MM8Me8 (8 eM) eee eeeeee eeeee eeee eeeeeeee ee [Me(Me)8Me8] (8.88 e, 8 eeee) ee MM8Me8 (88 eM). Mee eeeeeee eee eeeeeee eee eeeeeee eee eee eee eeeeeeee eeeeeeeeee eeee eeeeeee ee 88°M/8.8 Meee ee eeee eee eeeeeeeeeeee eeee, eee-eeeee eeeeeeeeeee eeeeeee; eeeee: 8.88 e (88%); ee 888–888°M (eee).

Meeeeeeee eeeeeeee eee eeeeeeeeee(η8-eeeeeeeeeeeeeeee)eeeeeeeee(MM) (‌88‌, M = Me); eeeee: 888%; ee 888–888°M (eee).

Mee(η8-eeeeeeeeeeeeeeee)eeeeeeeeeeeee(MM) (‌88‌, M =Me): Meeeeee Meeeeeeee:[‌88‌]

MM8 (8.88 e, 8.8 eeee) ee MM8Me8eee eeeee ee [Me(Me)8Me8] ee MM8Me8 (88 eM). Meeee eee eeeeeeeee eeeeeee eee eeee eeeeeee eee 8 eee, eeeeeee eee eeeeeee ee 88°M/8.8 Meee ee eeee eee eeeeeeeeeeee eeee eeeeee eeeeeee; eeeee: 8.88 e (888%).

Meeeeeeee eeeeeeee eee eee(η8-eeeeeeeeeeeeeeee)eeeeeeeeeeeeeee(MM) (‌88‌, M = Me); eeeee: 888%; ee 888–888°M (eee).

References

Meeeeee Meeeeeeeeee

• 8.Meeeee-Meee, (8888) M 88-8, 888.
• 8.Meeeee-Meee, (8888) M 88-8, 888.