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Despite their importance as potential intermediates, carbenevanadium complexes are still a rarity. Reaction of (butadiene)zirconocene or (butadiene)hafnocene with [CpV(CO)4] affords 1, which for M Zr is in equilibrium with the reaction partners in solution, whereas for M Hf it is in equilibrium with 2.
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Erker et al. (1987) studied this question.
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