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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 M 1 is zirconium, the radicals R 1 are alkyl, the radicals R 2 are halogen or...
5247107 Process for the preparation of organometallic compounds  
There is disclosed a process for the preparation of compounds of formula I [R Fe R 2 ] q ♁ X q .crclbar. (I), wherein R is an anion of formula C 5 H 4 R 1 or C 9 H 7 , R 1 is...
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 R 1 is (C 1 -C 5 )perfluoroalkyl, R 2 is (C 1 -C 5 )perfluoroalkyl or (C 1 -C 5 )alkyl, R 3 is (C 1 -C 5...
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...
5200537 Process for preparing metallocenes  
A process is provided for preparing a transition metal compound of the formula: (RC 5 H 4 ) 2 MX 2 , where R is hydrocarbyl or silahydrocarbyl of 1 to 10 carbon atoms, M is titanium or zirconium...
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...
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...
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...
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...
5075467 Process for the preparation of titanocenes containing O,O'-difluoroaryl ligands  
An improved preparation of titanocenes of the formula I ##STR1## in which R 1 is cyclopentadienyl .crclbar ., indenyl .crclbar . or 4,5,6,7-tetrahydroindenyl .crclbar ., each of which is...
5068371 Novel nitrogen-containing titanocenes, and the use thereof  
Titanocenes of the formula I ##STR1## in which R 1 are cyclopentadienyl .crclbar . groups and R 2 and R 3 are aromatic radicals which are substituted in both ortho-positions by fluorine and, in...
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...
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...
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...
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...
4973722 Process for preparing organometallic compounds  
A process is described for preparing compounds of the formula I [R Fe R 2 ] q ♁X q .crclbar. (I) in which R is an anion of the formula C 5 H 4 R 1 or C 9 H 7 , R 1 is...
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, --CF 3...
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...
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...
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...
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 R 1 denotes a substituent group on the...
4868288 Process for preparing metallocene complexes  
The invention relates to a process for the preparation of compounds of formula Ia [R 1 FeR 2 ' ] ♁ q [LQ m ] q .crclbar.(Ia), wherein R 1 is a π-arene, R 2 ' is an anion of a π-arene, L...
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...
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...
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...
4699987 (Perfluoroalkyl)-cyclopentadienylthallium  
Perfluoroalkylcyclopentadienylthallium compounds of the general formula: ##STR1## wherein n=1-5 are disclosed which are useful to modify the properties of transition metal complexes by the...
4590287 Fluorinated titanocenes and photopolymerizable composition containing same  
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...
4556719 Production of transition metal complexes  
The invention relates to a process for the production of complex compounds of the transition metals which is characterized in that transition metals are reacted with magnesium, to which a catalytic...
4507241 Method for the hydrocarbylation of naphthoquinone derivatives  
A method for the hydrocarbylation of naphthoquinones comprising cross-coupling addition of the hydrocarbyl moiety of selected organometallic reagents to leaving group-substituted naphthoquinones.
4415501 Alkenylzirconium reagents useful for prostaglandin analog synthesis  
Alkenylzirconium reagents of the general structural formula IX, ##STR1## are useful in the syntheses of prostaglandin analogs. In the preceding structural formula J is bromo or chloro, R 1 is...
4366101 Synthesis of long-chain alkanes having terminal functionality  
A process for preparing primary substituted n-alkane compounds, comprising contacting the olefin product of an olefin metathesis reaction having an alpha-olefin as the reactant with a...
4292253 Organo-metal catalysts and processes for their preparation  
Metal catalysts for use in known heterogeneous catalysis processes are prepared by vaporizing a metal in a low pressure environment in the vicinity of an organic liquid polymer, so that the metal...
4290918 Soluble polymerization catalysts, production of the same and their use  
Soluble catalysts for polymerizations are provided which are formed from an organic polymeric material containing at least one functional group bound to a metal, metal ion or metal complex. These...
4268455 Chelating tertiary amino metal amides  
Chelating tertiary amino metal amides selected from compounds having the formulae: Mg ++ [Chel N] 2 .crclbar . wherein [Chel N] .crclbar . is not ##STR1## [Chel N] .crclbar . M ♁, [Chel N]...
4266945 Molybdenum-containing compositions and lubricants and fuels containing them  
Molybdenum-containing compositions are prepared by the reaction of an acid of molybdenum or salt thereof, phenol or aldehyde condensation product therewith, and a primary or secondary amine. The...
4231948 Lithium dicyclopentadienyl titanium hydride compositions  
Novel lithium dicyclopentadienyl titanium hydride type compositions are described, useful as catalysts in converting ethylene to 1-butene, which is used in producing "polymer gasoline" for...
4207245 Organometallic intercalates of metal chalcogenohalides  
A new group of materials comprises intercalates of organometallic compounds in layered structures of metal chalcogenohalides. The organometallic intercalates are represented by the general formula...
4169845 Method of preparing transition metal-olefin complex compounds and alkali metal-transition metal-olefin complex compounds  
The invention relates to the reaction of cyclopentadienyl-transition metal compounds, (C 5 H 5 ) 2 M or C 5 H 5 --M(L) n (M=transition metal, L=olefin), with alkali metal in the presence of...
4151186 Preparation of acyl chlorides  
A process which comprises contacting a zirconium compound having the formula ##STR1## wherein Cp is a π-cyclopentadienyl radical and each Cp can be the same or different, X is an essentially...
4147709 Zirconium halohydride preparation  
Zirconium halohydrides having the formula ##STR1## WHEREIN R is a π-cyclopentadienyl radical are prepared by reacting a dihalide having the formula ##STR2## WITH MOLECULAR HYDROGEN IN THE PRESENCE...
4125567 Terminal olefin preparation  
Terminal olefin is prepared by bringing together (1) a compound having the formula ##STR1## wherein Cp is a π-cyclopentadienyl radical, R is terminal alkyl and X is an essentially non-interfering...
4046790 Catalytically active complex of titanium, cyclopentadienyl ligands, and ammonia  
A catalytically active compound or complex from the complex "bis-titanocene" (U.S. Pat. No. 3,776,932 of Dec. 4, 1973 to G. P. Pez) by reaction thereof with ammonia at low temperature and in...
RE29368 Metal-organo compounds with sterically exposed metal-metal bonds, and a method for their production  
Metal-organo complex characterized as having at least one sterically exposed metal-metal bond, and having the structure: R n M M'R n wherein R represents a ligand which may contain one or more...
4039566 Process for the preparation of titanium thio-derivatives  
A thio-derivative of titanium, represented by the formulae: ##STR1## WHEREIN CP IS A CYCLOPENTADIENE AND R is an alkyl, aryl or cycloalkyl radical, is prepared by reacting a carbonyl derivative of...
4024169 Titanium complexes with nitrogen  
Complexes of the titanium cyclopentadienyl compound ##STR1## and nitrogen, having the probable structure: ##STR2## where the symbol N≉N represents a bonding state intermediate between the...
3880743 Process for preparing organometallic compounds  
Compounds having a metal-to-carbon bond are prepared by using an electric arc to comminute metal and thus produce as the comminution progresses, metal in a highly reactive, finely divided form,...
3853943 CYCLOPENTADIENES IN WHICH AT LEAST FOUR OF THE RING CARBONS CARRY CYANO SUBSTITUENTS AND METHODS FOR THEIR PREPARATION  
Cyclization of a dialkali metal salt of 1,1,2,3-4,4-hexacyano-2-butenediide with acid yeilds 1-amino-2,3-4,5,5-pentacyanocyclopentadiene which is converted to...
3728365 CYCLOPENTADIENYL-(GROUP IV-B METAL) HYDROCARBYL SULFINATES  
Novel sulfinato derivatives of cyclopentadienyl-titanium and -zirconium compounds, useful as plant-growth regulants, are prepared (1) by reacting sulfur dioxide with certain unsubstituted or...
3700710 METHYLENE BIS(ALUMINUM DIHALIDES) USEFUL AS POLYMERIZATION CATALYST COMPONENTS  
An electrolytic process is described for making certain bis-(halometal)methanes such as bis(dichloroaluminum)methane, Cl 2 AlCH 2 AlCl 2 , which is a new compound, and these compounds can be...
3622367 CONTACT DEPOSITION OF PLATINUM AND OTHER METALS  
A method is provided for the deposition of a metal on a substrate. The substrate has active surfaces and deposition is effected by mixing the substrate with a solution containing an alcohol and a...
Matches 401 - 450 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >