Reaction of tetrakis(aryl isocyanide)nickel complexes (Ia–c) with diphenylacetylene gave the diiminocyclobutenes (IIIa–c); on pyrolysis, the acetylene complex (Va) gave (IIIa) as sole product, while with (Vd) the major product was iminocyclopentadiene (VId).
Y. Suzuki and T. Takizawa, J. Chem. Soc., Chem. Commun., 1972, 837 DOI: 10.1039/C39720000837
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