Formation of fulvene and dimethylenecyclopentenyl titanium complexes from bis(η5-tetramethylcyclopentadienyl)titanium(IV) precursors

Article abstract of DOI:10.1016/0022-328X(91)83283-A

A mixture of isomeric (Me4C5H)(Me3C5(CH2)H)TiMe compounds was obtained by thermally induced methane elimination from (Me4C5H)2TiMe2 at 130 deg C, analogous to the formation of (Me5C5)(Me4C5(CH2))TiMe.The compound (Me5C5)(Me3C5(CH2)2)Ti was newly prepared in 27percent yield by boiling a (Me5C5)2TiCl2-LiAlH4 mixture in toluene, followed by sublimation of the soluble product.By an analogous process, (Me4C5H)(Me2C5(CH2)2H)Ti was obtained in 10percent yield.Neither type of complex was formed by either method from titanocene derivatives with fewer methyl groups at cyclopentadienyl ligands.