| 摘要 |
An improved preparation of titanocenes of the formula I in which R1 is cyclopentadienyl~, indenyl~ or 4,5,6,7-tetrahydroindenyl~, each of which is unsubstituted or monosubstituted or polysubstituted by C1-C18alkyl, C1C18alkoxy, C2-C18alkenyl, C5-C8cycloalkyl, C6-C10aryl, C7-C16aralkyl, -Si(R3)4, -Ge(R3)4 or halogen, or the two R1 radicals together are a divalent radical of the formula II in which Z is -(CH2)m where m = 1, 2 or 3, unsubstituted or phenyl-substituted C2-C12alkylidene, -Si(R3)2- or -Si(R3)2-O-Si(R3)2-, and R3 is C1-C12alkyl or C6-C10aryl, and R2 is six-membered carbocyclic aromatic ring which is substituted by fluorine in both the ortho-positions to the Ti-C bond and which may also have further substituents, involves the addition of certain lithium amides to a mixture of (R1)2TiX2 (X = halogen) and HR2 at -30.degree.C to +25.degree.C.
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