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Reaction of carbon monoxide with biscyclopentadienyl-methyl- or -benzyl-vanadium(III) gave carbonylbiscyclopentadienylacylvanadium(III), while under the same conditions biscyclopentadienylphenylvanadium(III) yielded dicarbonyl (phenyl-η4-cyclopentadiene)(η5-cyclopentadienyl)vanadium(I) which forms carbonyl(cyclopentadienyl)(phenylcyclopentadienyl)vanadium(II)via phenyl migration to a cyclopentadienyl ligand.
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Fachinetti et al. (1974) studied this question.
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