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1-Azadiene complexes of zirconocene were prepared by ligand exchange between zirconocene butene and the 1-azadiene, and by a C–H activation route from allylic amines; they are best described as 1-zircona-2-azacyclopent-3-enes and 5-unsubstituted examples are fluxional.
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Davis et al. (1991) studied this question.
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