Transformation of the First Zirconocene Alkyne Complex without an Additional Phosphane Ligand into a Dinuclear σ‐Alkenyl Complex by Hydrogen Transfer from η5‐C5H5 to the Alkyne Ligand

The agostic interaction between the alkenyl CH groups and the Zr centers is the most notable feature of the dinuclear complex 1, which is formed from the alkyne complex [Cp2Zr(thf)(Me3SiCCSiMe3)] upon thermal loss of THF. In this transformation a H atom is transferred from the Cp ligand to the alkyne ligand.