Synthesis and Characterization of the Dodecahexaynediyldiiron Complex, Fp*−(C⋮C)<sub>6</sub>−Fp* [Fp*= Fe(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)(CO)<sub>2</sub>], the Longest Structurally Characterized Polyynediyl Complex SakuraiAizoh AkitaMunetaka Moro-okaYoshihiko 1999 Cu-catalyzed oxidative coupling of the hexatriynyl complex Fp*−(C⋮C)<sub>3</sub>−H affords the dodecahexynediyl diiron complex Fp*−(C⋮C)<sub>6</sub>−Fp*. Its linear but slightly twisted structure has been revealed by X-ray crystallography.