Reaction of [Ir(CO)3X](X = Br or Cl) with diphenylacetylene and with hex-3-yne gives the polymeric cyclic diacyl compounds [Ir{R2C2(CO)2}(CO)X]n(R = Ph or Et) which depolymerize with various ligands giving monomeric cyclomaleoyl complexes of iridium(III).
F. Canziani, M. C. Malatesta and G. Longoni, J. Chem. Soc., Chem. Commun., 1975, 267 DOI: 10.1039/C39750000267
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