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Abstract

The invention relates to η⁵:η¹-cyclopentadienylidene-phosphorane constrained geometry complexes of rare earth metals, abbreviated to η⁵:η¹-CpPC-CGC, method for production and use of same. The η⁵:η¹-CpPC-CGCs correspond to the general formula (1), wherein SE=Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu; X=independently of one another, a mono-anionic diorganoamido-, bistrimethylsilylamido-, halogenido-, alkyl-, aryl-, alkoxo-, aryloxo- or alkylaluminate (AlR₄⁻) substituent; L=neutral ligand (PR₃, NR₃, pyridine), solvent molecule (THF, ether, DMF, DMSO, HMPT, tetrahydropyran THP, tetrahydrothiofuran THT); R=alkyl with up to 1-10 C atoms or mono- or polycyclical aryl with 6 to 20 C atoms; R¹, R⁴=independently of one another H or methyl; R², R³=independently of one another, H or methyl or tertiary butyl or together a substituted cycloalkyl group; R⁵, R⁶=methyl, n-butyl, tertiary butyl or phenyl; R⁷, R⁸=independently of one another H, trimethylsilyl, alkyl with 1-10 C atoms or mono- or polycyclical aryl with 6 to 20 C atoms, and m=0, 1, 2 or 3.

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First Claim