A remarkable twelve-membered heterocycle is present in the title complex anion 1. It is formed in the reaction of the NBu4 salt of the corresponding hydroxo-bridged anion with malonitrile in the molecular ratio 1:2. Catalytic amounts of the Ni compound, on the other hand, effect a cyclotrimerization of the malonitrile, leading to a highly functionalized pyridine derivative.
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López et al. (1991) studied this question.
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