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 Me₃SiC[triple bond, length half m-dash]C–C[triple bond, length half m-dash]CSiMe₃ yields the first early transition metal η³-enyne complex [Cp*₂Ti{η³-Me₃SiC₃[double bond, length half m-dash]C(C[triple bond, length half m-dash]CSiMe₃)SiMe₃}] 1 which is suggested to be an intermediate in early transition metal catalysed oligomerization reactions of alk-1-ynes.

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