| 摘要 |
<p>In a process for the racemoselective preparation of silicon-bridged dialkyl-ansa-metallocenes of the formula (I) comprises reaching a ligand starting compound of the formula (II) with a transition metal dialkyl compound of the formula (III) M1XxR12*Dy (III), where M1 is an element of group 4, 5 or 6 of the periodic Table of the Elements, R1 are identical C¿1?-C20-alkyl or C7-C40-arylalkyl radicals, X are identical or different halogens, R?2¿ are identical or different C¿1?-C40 radicals, R?3¿ are identical or different C¿1?-C40 radicals, T is a divalent C1-C40 group which together with the cyclopentadienyl ring forms a further saturated or unsaturated ring system which has a ring size of from 5 to 12 atoms, where T may contain the heteroatoms Si, Ge, N, P, O or S in the ring system fused onto the cyclopentadienyl ring, M?2¿ is Li, Na, K, MgCl, MgBr, Mgl, Mg or Ca, D is an uncharged Lewis base ligand, x is equal to the oxidation number of M1 minus 2, y is from 0 to 2 and p is 1 in the case of doubly positively charged metal ions or 2 in the case of singly positively charged metal ions or metal ion fragments.</p> |
