Bent metallocene

This method applies to the synthesis of the bent metallocene dihalides of titanium, zirconium, hafnium, and vanadium: In the earliest work in this area, Grignard reagents were used to deprotonate the cyclopentadiene.

Although bent metallocenes are of no commercial value as olefin polymerization catalysts, studies on these compounds were highly influential on the industrial processes.

Reactions involving the related Cp2Zr2Cl2/Al(CH3)3 system revealed the beneficial effects of trace amounts of water for ethylene polymerization.

It is now known that the partially hydrolyzed organoaluminium reagent methylaluminoxane ("MAO") gives rise to families of highly active catalysts.

[2] Work in this are led to constrained geometry complexes, which are not bent metallocenes, but exhibit related structural features.

"Titanocene" is not Ti(C 5 H 5 ) 2 , but this fulvalene dihydride complex.
Double tuck-in complexes, such as this derivative of decamethyltungstocene, are typical products of bent metallocenes.