Abstract: The present invention relates to a method for determining the functionality and integrity of depth filter sheets and depth filter sheet systems comprising inorganic layered double hydroxide for contaminant removal in biotechnological processes.

Abstract: The present invention relates to a method for determining the functionality and integrity of depth filter sheets and depth filter sheet systems comprising inorganic layered double hydroxide for contaminant removal in biotechnological processes.

Abstract: The invention relates to novel immobilisable imidazolium salts of the general formulae (I) and (II) which contain a group R carrying SiR?n(OR?)3?n on one of the two nitrogen atoms and a sterically demanding cyclic hydrocarbon radical on the other of the two nitrogen atoms of the heterocyclic ring. The invention furthermore relates to the use of the compounds of the general formulae (I) and (II) as starting materials for immobilisable catalyst ligands, catalyst precursors and catalysts, and to the use as solvents in organic, organometallic and transition metal-catalysed synthesis and as catalysts in organic synthesis.

Abstract: The invention relates to immobilisable ruthenium catalysts containing N-heterocyclic carbene ligands of the general formulae (I) and (II) which contain an SiR?n(OR?)3 -carrying group on one of the two nitrogen atoms of the NHC ligand, and to the use thereof as homogeneous catalysts in C-C coupling reactions, in particular olefin metathesis. The invention furthermore relates to the use of the compounds as starting materials for the preparation of analogous immobilised ruthenium catalysts containing N-heterocyclic carbene ligands.

Abstract: The invention relates to immobilisable N-heterocyclic carbenes of the general formulae (I) and (II) which contain an SiR?n(OR?)3-n-carrying group on one of the two nitrogen atoms of the heterocyclic ring. The invention furthermore relates to the use of the compounds as ligands for immobilisable and immobilised catalysts.

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: The present invention relates to a support for catalysts which has a content of physisorbed water of at least 2.5% by weight. Further subject-matters of the application are a process for preparing heterogeneous catalysts containing these supports and the use of these catalysts for olefin polymerization and also a polymerization process using the catalysts.

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.