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Nickel(0) complexes having only one tetraphenylcyclobutadiene ligand (Ph4C4) and one cycloalkene ligand (L) are accessible with surprising ease, e.g. by prolonged stirring of the reagents given below in either at −50°C. (1a) and (1b), green crystals, only decompose at 220 and 260°C, respectively. [(1a), L = 1,5-cyclooctadiene; (1b), L = cyclooctatetraene.]

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