Abstract: The present invention relates to a process for preparing a metallocene, which comprises reacting a ligand starting compound with an adduct of the formula (I), M1XnDa ??(I) where M1 is a metal of group III, IV, V or VI of the Periodic Table of the Elements or an element of the lanthanide or actinide series, preferably titanium, zirconium or hafnium, particularly preferably zirconium, X are identical or different and are each halogen, C1–C10-alkoxy, C6–C10-aryloxy, C1–C10-alkylsulfonate such as mesylate, triflate, nonaflate, C6–C10-arylsulfonate such as tosylate, benzenesulfonate, C1–C10-alkylcarboxylate such as acetate, formate, oxalate or 1,3-dicarbonylate such as acetylacetonate or fluorinated 1,3-dicarbonylate, in particular chlorine, bromine, particularly preferably chlorine, n is an integer and is 2,3,4,5 or 6 and corresponds to the oxidation number of the metal M1, a is an integer or fraction and 0<a?4 and a is preferably in the range from 0.5 to 2.5 and is in particular 1, 1.

Abstract: The present invention relates to a process for preparing substituted benzoyl chlorides of the formula (1) where R, x and y have the meaning given below, which comprises reacting a benzaldehyde of the formula (2) where R, independently of each other, is identical or different and is an unsubstituted phenyl radical or a phenyl radical that is substituted by halogen, NO2, CN, (C1-C4)alkyl or (C1-C4)alkoxy, or is halogen, NO2, CN, NR?2, OR?, SO2R?, SO2OR?, COR? or CO2R?, where R? is an unbranched or branched C1-C10 alkyl radical, an unsubstituted phenyl radical or a phenyl radical which is substituted by halogen, NO2, CN, (C1-C4)alkyl or (C1-C4)alkoxy, x is 1 or 2 and y is 1, 2 or 3, with a chlorinating agent in the presence of a free-radical initiator and a solvent at from ?20 to +200° C.

Abstract: The present invention relates to compounds of the formula 1

Abstract: The present invention relates to compounds of the formula in which one, two or three of the radicals R1, R2, R3 and R4 are where m and n are an integer from 1 to 10, R5, R6, R7 and R8 are, independently of one another, identical or different and are a straight-chain or branched alkyl radical having 1 to 10 carbon atoms, and the remaining radical(s) R1 to R4 are or —NR9R10, where R9 and R10 are identical or different and are a straight-chain or branched alkyl radical having 1 to 10 carbon atoms, and X− is an inorganic or organic anion or an equivalent of a multiply charged inorganic or organic anion. The invention further relates to mixtures of substances comprising compounds of the formula (1), to a process for preparing the compounds of the formula (1) and to the use thereof.

Abstract: The present invention relates to a process for preparing substituted benzoyl chlorides of the formula (1) 1

Abstract: The present invention relates to compounds of the formula 1

Abstract: The present invention relates to compounds of the formula in which one, two or three of the radicals R1, R2, R3 and R4 are where m and n are an integer from 1 to 10, R5, R6, R7 and R8 are, independently of one another, identical or different and are a straight-chain or branched alkyl radical having 1 to 10 carbon atoms, and the remaining radical(s) R1 to R4 are or —NR9R10, where R9 and R10 are identical or different and are a straight-chain or branched alkyl radical having 1 to 10 carbon atoms, and X− is an inorganic or organic anion or an equivalent of a multiply charged inorganic or organic anion. The invention further relates to mixtures of substances comprising compounds of the formula (1), to a process for preparing the compounds of the formula (1) and to the use thereof.

Abstract: A stereorigid metallocene compound contains, as ligands, an aryl-substituted cyclopentadienyl radical, linked via a hydrogen bridge, and a substituted or unsubstituted fluorenyl radical. The novel metallocene compound is suitable as a catalyst component for olefin polymerization.

Abstract: The present invention relates to mixtures comprising from 70 to 99.5% by weight of a compound of the formula (R)4P+X− (1) and from 30 to 0.5% by weight of a compound of the formula (R)3P═O (2), where R is in each case a radical and X− is an inorganic or organic anion or the equivalent of a multiply charged inorganic or organic anion, also to a process for preparing the mixtures by reacting a phosphorus pentahalide with pyrrolidine or piperidine in the molar ratio 1:6 to 1:50 in the presence of an inert solvent initially at −20 to 80° C., subsequently continuing the reaction at 90 to 180° C., treating the resulting reaction product at 0 to 80° C. with aqueous alkali at a pH of 7 to 15, and separating aqueous and organic phase from one another, and to the use of the mixtures as catalyst and cocatalyst for phase-transfer reactions, nucleophilic substitution reactions or halogen-fluorine exchange reactions.

Abstract: The present invention relates to a process for preparing substituted benzoyl chlorides of the formula (1) 1

Abstract: The present invention relates to a process for preparing a methylene-bridged biscyclopentadienyl compound having the formula I where L are, independently of one another, identical or different and are each a cyclopentadienyl group, by reacting one or two cyclopentadienyl compounds LH with formaldehyde in monomeric, oligomeric or polymeric form or formaldehyde-generating reagents in the presence of at least one base and at least one phase transfer catalyst.

Abstract: Process for preparing a methylene-bridged cyclopentadienyl compoundThe present invention relates to a process for preparing a methylene-bridged biscyclopentadienyl compound having the formula I ##STR1## Where L are, independently of one another, identical or different and are each a cyclopentadienyl group, by reactin one or two cyclopentadienyl compounds LH with formaldehyde in monomeric, oligomeric or polymeric form or formaldehyde-generating reagents in the presence of at least one base and at least one phase transfer catalyst.

Abstract: The present invention relates to a stereorigid metallocene compound which has as ligands at least two substituted or unsubstituted cyclopentadienyl groups which are connected to one another via a five-membered ring, where at least one cyclopentadienyl group is fuzed to the five-membered ring and the ligand system of the stereorigid metallocene compound is different from 4-?(.eta..sup.5 -3'-alkyl-cyclopentadienyl)-4,6,6-trimethyl-(.eta..sup.5 -2-alkyl-4,5-tetrahydropentalene)!. The metallocene compound of the invention is suitable as a catalyst component for olefin polymerization.