Nickel(II)−aminoacrylate, −aminoiminoacrylate, and −amidoiminomalonate complexes 1−4 are suitable precursors together with appropriate cocatalysts for the catalytic dimerization of ethylene, propylene, and α-olefins with short chain lengths such as 1-hexene. Suitable ligands IV−VI, VIII, X, and XII generate nickel(II) compounds 1−4 active for these catalytic dimerizations. The influence of different substituents attached to the coordinating ligand backbone is tested in the catalytic reactions. Several novel monodentate and chelate nickel(II) precursor complexes 1 and 3 were isolated and also characterized by X-ray structure analysis.

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The products are of biological interest. -(CIESIELSKI, M.; PUFKY, D.; DOERING*, M.; Tetrahedron 61 (2005) 24, 5942-5947; Inst. Tech. Chem., Kernforschungszent. Karlsruhe, D-76021 Karlsruhe, Germany; Eng.) -Jannicke 41-134

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