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Deep-violet cubic crystals of an 18e-Nio complex with two ethene ligands are formed when tris(ethene)nickel(0) is allowed to react with 1,4-bis(2,6-diisopropylphenyl)-1,4-diazabutadiene (see 1). The ethene ligands of this extremely reactive complex can be replaced, for example, by hexadiene and cyclooctatetraene. Attempted coupling of the two ethene ligands with the Ni atom to give a nickelacyclopentane complex failed.
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Bonrath et al. (1990) studied this question.
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