Rare earth compounds and their use as polymerisation catalysts for unsaturated compounds

摘要

Catalysts based on rare earth metal allyl complexes of formula Ä(C3R<1>5)rM<1)ÄM<2)q)4-pÜ<-> (I) are claimed, in which M<1> = trivalent rare earth metal with an atomic number of 21, 39 or 57-71; X = anion; D = neutral donor ligand; M<2> = a Group IIIb element; R<1> = H, optionally unsaturated 1-30C alkyl or 5-30C cycloalkyl (optionally containing hetero atom(s)), 6-30C aryl (optionally containing hetero atom(s), optionally substituted with one or more 1-30C alkyl, alkenyl or alkynyl groups or 6-30C phenyl groups and/or optionally condensed with other 6-30C aromatics), or a silyl group substituted with 1-30C alkyl, alkenyl or alkynyl or with 6-30C phenyl groups; R<2> = F or 1-10C fluoroalkyl; n = 0-10; p = 0-3; q = 1-5; r = 1-2. Also claimed is a process for the production of (I) by reacting a compound of formula (C3R<1>5)sM<1)q)3-m (III) or Ä(D)nHÜÄM<2)q)4-rÜ (IV) (in which m = 0-2 and s = 1-3) in inert solvent and/or diluent at -80 to 140 degrees C in a mol ratio of (II):(III or IV) = 1:(0.1-10).