Regiospezifische Insertion von Phenylacetylen in die ZrP‐Bindung von Cp 2 Zr{P(SiMe 3 ) 2 }(Cl) und Folgereaktionen des Insertionsprodukts ( Z )‐Cp 2 Zr{C(Ph)  C(H)P(SiMe 3 ) 2 }(Cl)

Regiospecific Insertion of Phenylacetylene into the ZrP bond of Cp 2 Zr{P(SiMe 3 ) 2 }(Cl) and Derivatives of the Insertion Product ( Z )‐Cp 2 Zr{C(Ph) C(H)P(SiMe 3 ) 2 }(Cl) The reaction of Cp 2 Zr{P(SiMe 3 ) 2 }(Cl) ( 1 ) with phenylacetylene in boiling toluene yields regiospecifically the insertion product ( Z )‐Cp 2 Zr{C(Ph) C(H)P(SiMe 3 ) 2 }(Cl) ( 2 ) which reacts with MeLi or n BuLi by forming the corresponding alkyl‐substituted zirconocene derivatives ( Z )‐Cp 2 Zr{C(Ph) C(H)P(SiMe 3 ) 2 }(R) [R Me ( 3 ), n Bu ( 4 )]. The attempt to prepare the C(Ph) C(H)P(SiMe 3 ) 2 − ligand directly from Li(THF) 2 P(SiMe 3 ) 2 and phenylacetylene yields HP(SiMe 3 ) 2 and LiCCPh. An X‐ray structure determination of 2 and 3 was carried out.