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Please login to access the full content or check if you have access via2.11.8.2.4 Variation 4: Formation of Bis(η5-cyclopentadienyl)zirconium–Alkene Complexes
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Negishi, E.-i.; Takahashi, T., Science of Synthesis, (2003) 2, 789.
One of the most useful zirconium–alkene complexes is (η2-but-1-ene)bis(η5-cyclopentadienyl)zirconium(II) (382), which is prepared in situ from dibutylbis(η5-cyclopentadienyl)zirconium(IV) (64), commonly referred to as the Negishi reagent. Since the butene ligand is very labile, this complex acts as a “Zr(Cp)2” equivalent.[209] The conversion of dibutylbis(η5-cyclopentadienyl)zirconium(IV) (64) into 382 might be rather complicated;[332,333] formally, however, β-hydrogen abstraction is the key step for the formation of the butene complex. In the presence of trimethylphosphine, the formation of (η2-but-1-ene)bis(η5-cyclopentadienyl)(trimethylphosphine)zirconium(II) (383) is observed (Scheme 140).[208,334]
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Meeeeeeeeeee Meeeeeeee
(η8-Mee-8-eee)eee(η8-eeeeeeeeeeeeeeee)eeeeeeeee(MM) (888):[888]
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Mee(η8-eeeeeeeeeeeeeeee)(η8-eeeeee)eeeeeeeee(MM) (888):[888]
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References
| [116] | Meeeeeee, M. M.; Meeeeeee, M. M.; Meeeee, M. M., M. Me. Meee. Mee., (8888) 888, 8888. |
| [208] | Meeeeeee, M. M.; Meeeee, M. M.; Meeeeee, M. M., M. Me. Meee. Mee., (8888) 888, 8888. |
| [209] | Meeeeee, M.; Meeeeeeee, M. M.; Meeeeeeee, M., Meeeeeeeeee Meee., (8888) 88, 8888. |
| [219] | Meeeeeeee, M.; Meeeeeee, M.; Meeeeee, M.; Meee, M.; Meeeeee, M., Meeeeeeeeee Meee., (8888) 88, 888. |
| [332] | Meeeee, M.; Meeeeeeee, M., M. Me. Meee. Mee., (8888) 888, 8888. |
| [333] | Meeeeeee, M. M.; Meeeee, M. M., Meeeeeeeeeeeeee, (8888) 88, 8888. |
| [334] | Meeeee, M.; Meeeee, M.; Meee, M.; Meeeeeee, M.; Meeee, M.; Meeeee, M.; Meee, M., Meee. Mee., (8888) 888, 8888. |
| [335] | Meeeeeeee, M.; Meeeeeee, M.; Meeeeeeee, M.; Meeeee, M.; Meeeee, M.; Meeeee, M.; Meeeee, M.; Meeeeee, M. M.; Meeeeee, M., Meee. Meee., (8888), 888. |
| [336] | Mee, M. M.; Meeeee, M. M.; Meeeeee, M.; Meeeee, M. M., M. Meeeeeeee. Meee., (8888) 888, M88. |
| [337] | Meeeee, M. M.; Meeeeeee, M. M., Meeeeeeeeeeeeee, (8888) 8, 888. |
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