23-11-1995 дата публикации
Номер: DE4417542A1
Metallocenes of formula (I) are new, where M = Ti, Zr, Hf, V, Nb, Ta or a lanthanide; X1, X2 = 1-10C alkyl or alkoxy, 6-10C aryl or aryloxy, 2-10C alkenyl, 7-20C aralkyl or alkaryl, 8-20C aralkenyl, H or halo; L1, L2 = (a) opt. mono- or poly-substd. mono- or poly-nuclear hydrocarbon gps. contg. cyclopentadienyl unit(s), which can form sandwich structures with M; L1 and/or L2 is substd. and/or condensed with opt. substd. ferrocene (Fc) or ruthenocene (Rc) gps.; substits. = as above for X2/X2, or Fe or Rc; or (b) L1 = as above, and L2 = amido, phosphido or arsenido gp. of formula E-D< (with D = N, P or As; E = as for X1/X2); R1 = C, Si, Ge or Sn; A, B = as for X1.X2; n = 0-4; if n = 0, the free valencies on L1 and L2 are substd. by X1 or X2, on condition that n is not zero if L2 = amido, phosphido or arsenido. Also claimed are (1) prepn. of (I) by reacting cpds. of formula (II) with cpds. of formula (III) (with M' = alkali metal, X' = halo); and (2) prepn. of polyolefins by polymerisation of olefins in the presence of (I) as catalysts, pref. with aluminoxanes as co-catalysts.
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