The iridium complex generated in situ from [Ir(cod)Cl] 2 and a phosphine ligand catalyzed the dimerization of terminal alkynes to give ( E )-enyne, ( Z )-enyne, or 1,2,3-butatriene derivatives in the presence of triethylamine. The triarylphosphine complex selectively yielded linear ( E )-enynes for silylethynes, while the tripropylphosphine complex provided linear ( Z )-enynes for silylalkynes or 1,2,3-butatrienes for tert -alkylethynes.
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Ohmura et al. (2000) studied this question.
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