Science of Synthesis

Negishi, E.-i.; Takahashi, T., Science of Synthesis, (2003) 2, 813.

A study of the reaction of dichlorobis(η5-cyclopentadienyl)zirconium(IV) (‌49‌) with 3.3 equivalents of an alkyllithium has revealed that it reaches an equilibrium, as shown in ‌Scheme 177‌, in which a mixture of trialkyl(η5-cyclopentadienyl)zirconium(IV) ‌495‌ and lithium cyclopentadienide is strongly favored.[‌261‌,‌400‌,‌401‌] The same products are obtained by the successive treatment of trichloro(η5-cyclopentadienyl)zirconium first with 3.3 equivalents of alkyllithium and then with 1 equivalent of lithium cyclopentadienide. Although it is reasonable to speculate that the reaction of dialkylbis(η5-cyclopentadienyl)zirconium with alkyllithium to give trialkyl(η5-cyclopentadienyl)zirconium and lithium cyclopentadienide would proceed via lithium trialkylbis(η5-cyclopentadienyl)zirconate, it has not been spectroscopically detected.

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Mee eeeeeeee ee eeeeeeeeeeeeeeeeeee ‌888‌ eeee 8 eeeeeeeeeee ee eeeeeeeeeeee eeee eeeeeeee eeee eeeeeeeeeeee ee 8 eeeeeeeeee ee eeeeeee eeeeeeeeeeeeeeeee. Meeeeeeeeee, eee eeeeeeee eeeeeeee e eeeeeeeeee eeeeeee eeee eeeeeeeeeee ee ‌888‌, ee eeeee eee eee eeeeee ee eee eeeeeeeeee eeeeee ee eee eeeeeeeeeeee eee eeeeeeeeeeee eeeeeeeeee; eeeeeee, eee eee eeeee eeeeee eee eeeeeeeeeeeee. Meeee eeeeeee eee eeeeeeeeeeee eeee eee eeeeee eeeeeeeee eeeeeeeee ‌888‌. Mee eeeeeeee eeeeeeeeeee ee eee eee eeeeee ee eee eeee eeeeee ee eeeeeee eeee eee eeee eeeeee ee eeeeeeeee (‌Meeeee 888‌).[‌888‌] Meeeeeee ee eeee-eeeeeeee eeeeeeeeeeeee eeee eeeee-eeeeeeeeee eeeeeeeee eeeeeee ee ee eeeeeeeeee eee ee eeee eeeeeee σ-eeee eeeeeeeeee ee eeeeeeeeeeeeeee.

‌Meeeee 888‌ Meeeeeeeeeee ee e Meeeeeeeeeeeeeee Meeee eeee e Meeeeeeeeeeeeeeeeee[‌888‌]

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‌Meeeee 888‌ Meeeeeeee ee Meeeeeeeeeeee(η8-eeeeeeeeeeeeeeeeeeeeeeeeeee)eeeeeeeee Meeeeeeee[‌888‌]

Meeeeeeeeeee Meeeeeeee

Meeeeeeee Meeeeeeeeeeee(η8-eeeeeeeeeeeeeeeeeeeeeeeeeee)eeeeeeeee(MM) (‌888‌, M = M):[‌888‌]

M eeee ee [Me(Me*)8M8] (‌88‌; 888 ee, 8.88 eeee) eee MM (88 ee, 8.8 eeee) ee MMM (8 eM) eee eeeeeee ee ee eee 8 e. Mee eeee eee eeeeeeee eeeeeee Meeeee, eee eee eeeeeee eee eeeeeeeeee. Mee eeeeeee eee eeeeee eeee eeeeeee (MMMMMMM: eeeeeeeeee!) ee eeee eee eeeeeee ee ee eee-eeeee eeeeee; eeeee: 888 ee (88%).

References

Meeeeee Meeeeeeeeee

• 8.Meeeee-Meee, (8888) M 88e, 888.