Catalytic head-to-head alkyne dimerization to give Z-enynes

Article abstract of DOI:10.1016/S0040-4039(00)60851-1

The catalyst [Ir(biph) (PMe₃)₃ Cl] (biph = biphenyl-2,2′-diyl) gives head-to-head dimerization of 1-alkynes to the corresponding Z-enynes.