| abstract |
FIELD: organic chemistry, chemical technology. n SUBSTANCE: invention relates to a catalytic system comprising metallocene compound of the formula: wherein CpI and CpII represent carboanions with the cyclopentanedienyl-containing structure wherein from to all hydrogen atoms can be substituted; D means a donor atom possessing at least one electron pair; A means an acceptor atom that in its state it has electronic hole and D and A are bound by the reversible coordination bond and wherein a donor group receives a positive (partial) charge and an acceptor group - a negative (partial) charge; M means a transient metal of III, IV, V or VI subgroup of Mendeleyev's periodic law; x means anionic equivalent or η-complex compound of transient metals of the formula: (IIIa) or, respectively, (IIIb) wherein η means the charged or electrically neutral system that can be condensed with unsaturated or saturated rings; D means a donor atom or A with a transient metal M chosen from this group is carried out either directly or through a spacer and D and A are bound by a coordination bond as given above; X means anionic equivalent; n value depends on charge of M metals, and η means a number 0, 1, 2, 3, 4. Donor-acceptor structure promotes to stability of catalyst being up to high temperatures, i. e. without significant decrease of the catalyst activity and provides preparing polyethylenes with enhanced molecular mass and increased boiling point value. Also, invention relates to a method for preparing alpha-olefins. n EFFECT: valuable properties of catalyst, improved polymerization method. n 7 cl, 10 ex |