Abstract: The invention relates to the use of nitrogenous aluminium organyl complexes of general formula (I) as co-catalysts in heterogeneous polymerisation reactions of propene. In said formula: R, R?, R1 and R1? independently of one another represent branched or unbranched C1-C7 alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl or alkynyl; R2 represents unsubstituted, monoalkylated or polyalkylated and/or monofluorinated or polyfluorinated aromatic hydrocarbons from group (II); R3 and R4 independently of one another represent CH2, CF2 oder C(R1)2; m stands for 0, 1 or 2; n stands for 0, 1 or 2; o stands for 0 or 1, all independently of one another.

Abstract: Disclosed are compounds of formula (I) which compounds are useful as cocatalysts in olefinic polymerisation reactions, e.g., as Ziegler-Natta catalysts.

Abstract: The present invention relates to novel oxygen-containing organoaluminium complexes of the general formula (I) in which R1, independently of one another, denote branched or unbranched C1-C7-alkyl, -cycloalkyl, -alkenyl, -cycloalkenyl, -aryl or -alkynyl; R2 denotes unsubstituted, mono- or polyalkylated and/or mono- or polyfluorinated aromatic hydrocarbons from the group R3, R4, independently of one another, denote CH2, CF2 or C(R1)2; independently of one another, m denotes 0, 1, 2 n denotes 0, 1, 2. These compounds can serve as cocatalysts in olefinic polymerisation reactions. In particular, they can be employed for the preparation of novel Ziegler-Natta catalysts having improved properties, in particular having higher activities compared with conventional Ziegler-Natta catalysts with AlEt3, as cocatalyst, or of novel coordination catalyst systems which have higher activities than conventional Ziegler-Natta catalysts, even at low temperatures, such as 60° C., and a pressure of 2 bar.

Abstract: The present invention relates to a process for the refunctionalisation of chemically inert, thermally pre-treated metal oxides having an increased number of co-reactive groups on the oxide surface, without producing by-products which have a deactivating effect on catalytic components. The invention furthermore relates to the use of the refunctionalised metal oxides as catalyst supports for the polymerisation of olefins.

Abstract: The invention relates to the use of nitrogenous aluminium organyl complexes of general formula (I) as co-catalysts in heterogeneous polymerisation reactions of propene. In said formula: R, R′, R1 and R1′ independently of one another represent branched or unbranched C1-C7 alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl or alkynyl; R2 represents unsubstituted, monoalkylated or polyalkylated and/or monofluorinated or polyfluorinated aromatic hydrocarbons from group (II); R3 and R4 independently of one another represent CH2, CF2 oder C(R1)2; m stands for 0, 1 or 2; n stands for 0, 1 or 2; o stands for 0 or 1, all independently of one another. Said systems exhibit improved characteristics in terms of activity and stereoselectivity in comparison to conventional co-catalysts such as AlEt3 and can act simultaneously as co-catalysts and stereoselectivity promoters.

Abstract: Organometallic aluminum compounds of the general formula (I) where X1 is NH, NH2*, NH—A*, N—A, N(A)2*, O, OA*, O-Aryl*, S, SA*, P, P(A)2* or a single bond, X2 is NH, N—A, O, S, PA or X1 coordinated to Al(R1)3, or a single bond, R1 is H; Hal if n=0; A which may be covalently bound to Al; Si(A)3 if X1=O, R2 is A or divalent aryl groups defined note particularly below or divalent unsaturated aliphatic groups defined more particularly below, R3 and R4 are, independently of one another, a bond or R2 or Si(A)3 or Si(A)2, Z1 is a bond or H bound to R2, Z2 is a bond or H bound to R2 or R3, A is branched or unbranched C1-C7-alkyl, C1-C7-alkylidene or C1-C7-alkenylidene, Aryl is phenyl, naphthyl, Hal is F, Cl, and, independently of one another, n, m, p and l are 0 or 1 and q is 1 or 2, where &Sgr;l+m+n≧3.

Abstract: Described are catalyst systems having aluminium alkyl complexes of the formula (I) described herein applied to magnesium chloride, SiO2 or SiO2 in combination with MgCl2 as support in the presence of titanium halides or vanadium halides and internal and, if desired, external donors act both as cocatalysts and as stereoselectivity promoters in heterogeneous polymerizations of &agr;-olefins. Also described are polymerization methods using these catalyst systems.

Abstract: Described are catalyst systems having aluminium alkyl complexes of the formula (I) described herein applied to magnesium chloride, SiO2 or SiO2 in combination with MgCl2 as support in the presence of titanium halides or vanadium halides and internal and, if desired, external donors act both as cocatalysts and as stereoselectivity promoters in heterogeneous polymerizations of &agr;-olefins. Also described are polymerization methods using these catalyst systems.

Abstract: The present invention concerns a method of growing a cerium-doped SrS phosphor layer by the Atomic Layer Epitaxy-method. According to the invention an organometallic cerium compound containing at least one cyclopentadienyl type ligand is used as a precursor for the dopant cerium. The cyclopentadienyl type cerium compounds can be used as ALE precursors at about 400° C. substrate temperatures without any observable thermal decomposition during processing.

Abstract: The invention relates to dendrimeric organometallic bismuth compounds (bismuth dendrimers), which can advantageously be used as x-ray contrast media, as well as processes for their production.

Abstract: The invention relates to the use of intramolecularly stabilized organometallic compounds as components in coordination catalyst systems, corresponding coordination catalyst systems and processes for the preparation of polymers by coordination polymerization of unsaturated hydrocarbons by catalysed metathesis of alkenes and alkynes using such coordination catalyst systems.

Abstract: The invention relates to the use of cyclic organometallic compounds as components in coordination catalyst systems, to corresponding coordination catalyst systems and also to processes for the preparation of polymers by coordination polymerization and of unsaturated hydrocarbons by catalyzed metathesis of alkenes and alkynes using such coordination catalyst systems.

Abstract: The invention relates to the use of boron-containing organic group-V compounds for the deposition of the elements of the Vth main group on substrates by gas-phase deposition.

Abstract: The invention relates to the use of cyclic organometallic compounds as components in coordination catalyst systems, to corresponding coordination catalyst systems and also to processes for the preparation of polymers by coordination polymerization and of unsaturated hydrocarbons by catalyzed metathesis of alkenes and alkynes using such coordination catalyst systems.

Abstract: The invention relates to organometallic compounds of the elements aluminum, gallium and indium which are two-fold intramolecularly stabilized, and to the use thereof for the production of thin films and epitaxial layers by deposition from the liquid or solid phase.

Abstract: In a process for the production of thin films and epitaxial layers by gas-phase deposition, intramolecularly stabilized organometallic compounds are employed as a source of metal.

Abstract: In a process for the production of thin films and epitaxial layers by gas-phase deposition, intramolecularly stabilized organometallic compounds are employed as a source of metal.

Abstract: The invention relates to organometallic compounds which are stabilized intramolecularly and have a cyclic or bicyclic structure and to the use thereof for the preparation of thin films and epitaxial layers by gas phase deposition.

Abstract: In a process for the production of thin films and epitaxial layers by gas-phase deposition, intramolecularly stabilized organometallic compounds are employed as a source of metal.