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5498581 |
Method for making and using a supported metallocene catalyst system
Methods are disclosed for preparing a highly active solid metallocene-containing catalyst system and its use in the polymerization of olefins. The catalyst system is prepared by creating a catalyst...
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5496854 |
Metallocenes as anti-tumor drugs
The invention relates to novel titanocene derivatives possessing chemotherapeutic activity and method for their preparation. These compounds possess two cyclopentadiene rings linked to titanium as...
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5491205 |
Preparation of polymers of C2 -C10 -alk-1-enes using racemic metal-locene complexes as catalysts
Polymers of C2 -C10 -alk-1-enes are prepared at from 0.5 to 3000 bar and from -50° to 300° C. using a catalyst system by a process in which the catalyst system used is one which contains, as a...
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5474716 |
Process for the preparation of bridged cyclopentadienylmagnesium compounds and use thereof for preparing metallocenes
Disclosed are processes for the preparation of new bridged cyclopentadienylmagnesium compounds of the general formula Q(CpRa)(Cp'R'a ')Mg, and the use thereof for preparing bridged metallocenes.
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5468889 |
Boryl zirconocene organic 1,1-dimetallic compounds
Boron-zirconium 1,1,-dimetallic organic compounds useful in organic synthesis such as the preparation of alpha-bromoboranes. The boron-zirconium compounds include boron and zirconiun, and in...
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5451649 |
Organometallic fluorenyl compounds, preparation, and use
Benzofluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition,...
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5449651 |
Metallocene compound for a catalyst component with good catalyst efficiency after aging
This invention relates to a syndiospecific metallocene of a substituted iPr[(cyclopentadienyl)(fluorenyl)]zirconium dichloride containing long-chain terminal alkene, for example octenyl groups, on...
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5446221 |
Oleaginous compositions containing novel ethylene alpha-olefin polymer viscosity index improver additive
The present invention is directed to a lubricating oil composition exhibiting improved viscosity index comprising lubricating oil and a viscosity improving effective amount of ethylene alpha-olefin...
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5420320 |
Method for preparing cyclopentadienyl-type ligands and metallocene compounds
In accordance with the present invention there is provided a process for preparing a cyclopentadienyl-type ligand, the process comprises (1) reacting an alkali metal salt of a cyclopentadienyl-type...
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5405981 |
Copper catalyzed coupling reactions
A general method for sequential addition of two substituents to an α,β-unsaturated ketone (enone), involving 1,4-conjugate addition of a desired substituent group to the enone to form an i...
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5391789 |
Bridged, chiral metallocenes, processes for their preparation and their use as catalysts
Bridged, chiral metallocenes, processes for their preparation and their use as catalystsMetallocenes of the formula I ##STR1## in which, preferably, M1 is titanium, zirconium or hafnium, R1 is a...
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5384342 |
Vinyl ether urethane silanes
The present invention is directed to a compound of the Formula: R1 --R2 --R3 --R4 --A--(R5)n (R6)3-nwherein: A is Si or Ti; R1 is an alkenoxy, acryloxy or ethylenically unsaturated dicarboxylate...
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5374752 |
Process for the preparation of a high molecular weight olefin polymer
A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably, M1 is Zr or Hf, R1 and...
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5359102 |
Transition metal compound having two transition metal atoms in one molecule and method for polymerizing olefin by using the compound
A transition metal compound represented by the formula ##STR1## (wherein each of A1, A2, A3 and A4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A5 is a...
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5349100 |
Chiral metallocene compounds and preparation thereof by creation of a chiral center by enantioselective hydride transfer
There are provided enantiomerically enhanced chiral substituted cyclopentadienyl ligands, and compounds thereof, and a process for their making comprising contacting an optionally substituted...
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5347024 |
Preparation of addition polymerization catalysts via Lewis acid mitigated metal center oxidation
Addition polymerization catalysts comprising a derivative of a titanium or zirconium in the +4 oxidation state prepared by metal center oxidation and cation complex formation of a reduced metal...
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5340701 |
Fluorine-free titanocenes and the use thereof
Fluorine-free titanocene compounds of the formula I or II ##STR1## in which both R1 radicals are preferably, independently of one another, cyclopentadienyl.crclbar., which is unsubstituted or...
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5336795 |
Process for the preparation of transition metal complexes having monosubstituted cyclopentadienyl ligands
Disclosed is a process for the preparation of transition metal complexes having monosubstituted cyclopentadienyl ligands of the general formula: ##STR1## in which monomeric cyclopentadiene is...
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5329033 |
Process for the preparation of an olefin polymer
A very effective catalyst system for olefin polymerization consists of a cocatalyst, preferably an aluminoxane, and a metallocene of the formula (I) ##STR1## in which, preferably, M1 is Zr, R1 and...
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5306600 |
Oxygen-containing titanocenes, and the use thereof
Titanocenes of the formula I ##STR1## in which R1 are cyclopentadienyl.crclbar. groups and R2 and R3 are aromatic radicals which are substituted in both ortho-positions by fluorine and, in...
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5302733 |
Preparation of metallocenes
A racemic mixture of a chiral, silicon bridged transition metal metallocene, which is substantially free of meso isomer, is precipitated directly from a reaction mixture as it is formed by reacting...
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5286889 |
Transmetalations from zirconium to copper intermediates
Higher order cuprate complexes are prepared by means of a transmetalation from a corresponding zirconate intermediate. This process is particularly valuable with respect to the preparation of...
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5281733 |
Process for producing MMT
A process for the carbonylation of substituted metal coordination compounds in the presence of carbon monoxide at a pressure in excess of 400 psig to produce optionally substituted cyclopentadienyl...
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5279999 |
Catalyst composition
A catalyst composition obtained by contacting (a) a Group IVA metal compound of the general formula (Cp)p MeX4-pwherein Cp is, independently, cyclopentadienyl groups substituted with one or more...
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5276208 |
Metallocenes containing ligands of 2-substituted idenyl derivatives, process for their preparation, and their use as catalysts
The novel metallocenes of the formula I ##STR1## in which, preferably, M1 is Zr or Hf, R1 and R2 are alkyl or halogen, R3 and R4 are hydrogen, R5 and R6 are alkyl or haloalkyl, --(CR8 R9)m --R7...
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5268495 |
Metallocenes having bicyclic cyclopentadiene derivatives as ligands, processes for their preparation and their use as catalysts
The invention relates to a process for the preparation of a compound of the formula XI ##STR1## wherein preferably M1 is zirconium, the radicals R1 are alkyl, the radicals R2 are halogen or alkyl,...
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5247107 |
Process for the preparation of organometallic compounds
There is disclosed a process for the preparation of compounds of formula I [R Fe R2 ]q♁ Xq.crclbar. (I),wherein R is an anion of formula C5 H4 R1 or C9 H7, R1 is hydrogen, C1 -C6 -alkyl or h...
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5245064 |
1,2,3,4-tetraalkyl-5-perfluoroalkyl-cyclopentadiene, di-(perfluoroalkyl)-trialkylcyclopentadiene and transition metal complexes thereof
The present invention provides a compound of the formula: ##STR1## wherein R1 is (C1 -C5)perfluoroalkyl, R2 is (C1 -C5)perfluoroalkyl or (C1 -C5)alkyl, R3 is (C1 -C5)perfluoroalkyl or (C1...
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5214173 |
Cyclopentadienyl dicarbollide complexes of titanium, zirconium and hafnium
Novel cyclopentadienyl dicarbollide complexes of titanium, zirconiun and hafnium constitute a new class of neutral, 14-electron, d°, mixed-ring, bent-metallocene alkyl complexes which are useful ...
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5200537 |
Process for preparing metallocenes
A process is provided for preparing a transition metal compound of the formula: (RC5 H4)2 MX2, where R is hydrocarbyl or silahydrocarbyl of 1 to 10 carbon atoms, M is titanium or zirconium and X is...
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5166382 |
Transmetalations from zirconium to copper intermediates
Higher order cuprate complexes are prepared by means of a transmetalation from a corresponding zirconate intermediate. This process is particularly valuable with respect to the preparation of...
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5162466 |
Use of methylene-bridged derivatives of cyclopentadienyl dicarbollide complexes of titanium, zirconium and hafnium as polymerization catalysts
Methylene bridged derivatives of novel cyclopentadienyl dicarbollide complexes of titanium, zirconium and hafnium display high activity as ethylene polymerization catalysts in the absence of a...
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5158920 |
Process for producing stereospecific polymers
Process for the preparation of bridged metallocene catalysts. A substituted or unsubstituted cyclopentadiene is deprotonated in a polar solvent to form a solution of the corresponding anion...
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5117020 |
Process for the preparation of metallocenes
A transition metal salt and powder of the solid reaction product of the ligand with an alkyllithium are reacted at room temperature in a non-polar hydrocarbon. The metallocene thus obtained has a...
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5075467 |
Process for the preparation of titanocenes containing O,O'-difluoroaryl ligands
An improved preparation of titanocenes of the formula I ##STR1## in which R1 is cyclopentadienyl.crclbar., indenyl.crclbar. or 4,5,6,7-tetrahydroindenyl.crclbar., each of which is unsubstituted or...
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5068371 |
Novel nitrogen-containing titanocenes, and the use thereof
Titanocenes of the formula I ##STR1## in which R1 are cyclopentadienyl.crclbar. groups and R2 and R3 are aromatic radicals which are substituted in both ortho-positions by fluorine and, in...
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5036034 |
Catalyst for producing hemiisotactic polypropylene
This invention is for a metallocene compound which can be used in a catalyst system to produce hemiisotactic polymer. The compound is a bridged metallocene compound having dissimilar...
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5026625 |
Titanocenes, the use thereof, and n-substituted fluoroanilines
Titanocenes containing two 5-membered cyclodienyl gropus, for example cyclopentadienyl, and one or two 6-membered carbocyclic or 5- or 6-membered heterocyclic aromatic rings which are substituted...
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5004820 |
Preparation of chiral metallocene dihalides
A process for preparing chiral metallocene dihalides as catalytic agents in improved yields by deprotonation of 1,2-bis(2,3-disubstituted cyclopentadienyl)ethane followed by condensation with...
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5001244 |
Metallocene, hydrocarbylaluminum and hydrocarbylboroxine olefin polymerization catalyst
Olefin polymerization catalysts, and methods for their preparation, comprising a metallocene and the reaction product of a hydrocarbylaluminum with a trihydrocarbylboroxine. The catalyst may be...
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4973722 |
Process for preparing organometallic compounds
A process is described for preparing compounds of the formula I [R Fe R2 ]q ♁Xq.crclbar. (I)in which R is an anion of the formula C5 H4 R1 or C9 H7, R1 is hydrogen, C1 -C6 -alkyl or halogen, R2 i...
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4963470 |
Titanocenes and their use
Titanocenes with silylated π-cyclopentadienyl ligands in which one or two carbo- or heterocyclic aromatic rings are bonded to the titanium, the aromatic rings being substituted by fluorine, --CF3, ...
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4931417 |
Transition-metal compound having a bis-substituted-cyclopentadienyl ligand of bridged structure
A novel transition-metal compound having a bis-substituted cyclopentadienyl ligand of bridged structure (I) and a novel mixture of the compound (I) with an aluminoxane (B), each useful as catalyst...
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4910121 |
Photopolymerizable composition containing metallocenes
Titanocenes containing π-cyclopentadienyl ligands, in which one or two carbocyclic or heterocyclic aromatic rings are attached to the metal atom, said aromatic rings being substituted by fluorine ...
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4892851 |
Process and catalyst for producing syndiotactic polyolefins
The invention provides a metallocene catalyst for use in preparing syndiotactic polyolefins. The catalyst comprises a bridged metallocene in which one of the cyclopentadienyl rings is substituted...
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4874880 |
Bis(di-, tri- or tetra-substituted-cyclopentadienyl)-zirconium dihalides
Bis(di-, tri- or tetra-substituted-cyclopentadienyl)zirconium dihalides represented by the following general formula [I] are provided, ##STR1## (wherein R1 denotes a substituent group on the...
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4868288 |
Process for preparing metallocene complexes
The invention relates to a process for the preparation of compounds of formula Ia [R1 FeR2' ]♁q [LQm ]q.crclbar.(Ia),wherein R1 is a π-arene, R2' is an anion of a π-arene, L is a divalent to hep...
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4855468 |
Titanocenes and a radiation-polymerizable composition containing these titanocenes
Titanocenes with π-cyclopentadienyl ligands, in which one or two carbocyclic or heterocyclic aromatic rings are bonded to the metal, the aromatic rings being substituted in at least one of the two ...
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4841004 |
Process for the preparation of a 1-olefin stereoblock polymer
Stereoblock polymers of 1-olefins having long isotactic sequences are obtained at industrially favorable polymerization temperatures using a catalyst which comprises a metallocene compound having...
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4767873 |
Helical metallocene oligomers and a method for their preparation
The invention describes a helicene compound having the structure ##SPC1##which contains seven six-membered conjugated aromatic rings capped by two five-membered rings which do not superimpose on...
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