Unusual formation of a hex-3-ene-1,5-diyne-3-yl ligand from a buta-1,3-diyne in the Cp*2TiCl2–Mg system

Abstract

The reaction of [Cp*₂TiCl₂] with equimolar amounts of magnesium in the presence of Me₃SiCC–CCSiMe₃ yields the first early transition metal η³-enyne complex [Cp*₂Ti{η³-Me₃SiC₃C(CCSiMe₃)SiMe₃}] 1 which is suggested to be an intermediate in early transition metal catalysed oligomerization reactions of alk-1-ynes.