Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F17/00—Metallocenes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
  • Y10S526/943—Polymerization with metallocene catalysts

Definitions

• the present invention relates to a process for preparing racemic metallocene complexes by reacting bridged or not bridged by ver ⁇ Ubergangsmetallaromatkomplexen the general formula I
• n is an integer between 1 and 4, where n is the valency of M minus the number 2,
• R 1, R 8 are identical or different fluorine, chlorine, bromine, iodine, Ci to C 2 o "alkyl, 3- to 8-membered cycloalkyl - which in turn is a Ca -.
• CiRj alkyl can carry a radical -, C ⁇ - to Cis-aryl, alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, arylalkyl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, Si (R 9 ) with R 9, the same or different, Ci- to C o -alkyl, C 3 - to Cao-cycloalkyl, C 6 - to cis-aryl, where the radicals mentioned can be partially or completely substituted with heteroatoms, R 2 to R 7 are the same or different hydrogen, Ci to
• C o-alkyl, 3- to 8-membered cycloalkyl - which in turn can carry a Ci- to Cio -alkyl radical -, Cg- to C ⁇ 5 -aryl, alkylaryl with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 C- Atoms in the aryl radical, aryl - alkyl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, Si (R 9 ) 3 with R 9 identical or different Ci to C 2 o-alkyl, C 3 - to Cio-cycloalkyl, C 6 - to C 5 aryl, adjacent radicals R 2 to R 7 can for 4 to
• R 11 Ci to Cio alkyl, C 6 to C 5 aryl, alkylaryl, arylalkyl, fluoroalkyl or fluoroaryl, each with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical,
• R 12 the same or different hydrogen, halogen,
• n 0, 1, 2, 3,
• Y is not bridging and represents two radicals R 'and R ", where
• R 'and R are the same or different and are hydrogen, fluorine, chlorine, bromine, iodine, Ci to C 0 alkyl, 3- to 8-membered cycloalkyl - which in turn is a Ci bis
• Cio alkyl may carry a radical -, C 6 - to C ⁇ 5 -aryl, alkylaryl having from 1 to 10 carbon atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, arylalkyl having from 1 to 10 carbon atoms in the alkyl radical and 6 up to 20 carbon atoms in the aryl radical, Si (R 9 ) 3 with R 9 identical or different Ci bis
• R l R * identical or different fluorine, chlorine, bromine, iodine, C - to C 2 o -alkyl, 3- to 8-membered cycloalkyl - which in turn can carry a Ci- to Cio -alkyl as a residue -, C ⁇ - to Cis-aryl, alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, arylalkyl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, Si (R 9 ) 3 with R 9, the same or different, C 1 -C 2 -alkyl, C 3 - to Cio "cycloalkyl, Cg- to cis-aryl, where the radicals mentioned can be partially or completely substituted by heteroatoms,
• R 2 to R 7 are the same or different hydrogen, Ci to
• Cis aryl alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, aryl ⁇ alkyl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, Si (R 9 ) 3 with R 9, the same or different, Ci to C 2 o "alkyl, C 3 - to Cio-cycloalkyl,
• adjacent radicals R 2 to R 7 can represent saturated, partially saturated or unsaturated cyclic groups having 4 to 15 carbon atoms and the radicals mentioned can be completely or partially substituted with heteroatoms,
• R l2 the same or different hydrogen, halogen, Ci “C ⁇ o” alkyl, Ci-Cao-fluoroalkyl, Cg "C ⁇ 0 - fluoroaryl, Cg-Cio-aryl, C ⁇ -C ⁇ 0 -alkoxy, C 2 -C ⁇ 0 -alkenyl, C Mean 7 -C o-arylalkyl, C 8 -C 40 arylalkenyl, C -C 0 alkylaryl, or where two radicals R i2 form a ring with the atoms connecting them,
• M is silicon, germanium or tin
• n 0, 1, 2, 3,
• Y is not bridging and represents two radicals R 'and R ", where
• R 'and R are the same or different and are hydrogen, fluorine, chlorine, bromine, iodine, Ci to C 2 o" alkyl, 3- to
• cycloalkyl - which in turn can carry a C 1 -C 10 -alkyl radical -, Cg- to Cis-aryl, alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, arylalkyl with 1 up to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, Si (R 9 ) 3 with R 9 identical or different Ci to C 2 o "alkyl, C 3 - to Cio-cycloalkyl, C ⁇ to Cis Aryl, or together with adjacent radicals R 4 or R 5 for 4 to 15 carbon atoms having saturated, partially saturated or for unsaturated cyclic groups stand, and the radical mentioned can be completely or partially substituted with heteroatoms,
• R 13 to R i7 are the same or different hydrogen, C ⁇ ⁇ to C 20 ⁇ alkyl, 5- to 7-membered cycloalkyl, - which in turn can carry a C ⁇ ⁇ to Cio-alkyl as a substituent -, Cg- to cis-aryl or arylalkyl , where adjacent radicals together can represent cyclic groups having 4 to 15 carbon atoms, or Si (R 18 ) 3 with
• R IQ to R 23 are the same or different hydrogen, -C ⁇ to C 2 o-alkyl, 5- to 7-membered cycloalkyl, - which in turn can carry a -C ⁇ to Cio-alkyl as a substituent -, C 5 - to cis-aryl or arylalkyl, where adjacent radicals may together represent cyclic groups having 4 to 15 carbon atoms, or Si (R 24 ) 3 with
• R i6 and Z together form a grouping - [T (R 25 ) (R 26 )] g -E- in which
• T can be the same or different and represents silicon, germanium, tin or carbon
• R 25 for hydrogen, C x - to C ⁇ 0 alkyl, C 3 - to C ⁇ 0 cycloalkyl or Cg to C ⁇ 5 aryl
• R 28 the same or different Ci- to Cio-alkyl, Cg- to Cis-aryl, C 3 - to C i0 -cycloalkyl or alkylaryl
• racemic metallocene complexes according to formula III as catalysts or as a component of catalysts for the polymerization of olefinically unsaturated compounds or as reagents or as catalysts in stereoselective synthesis.
• enantioselective organic synthesis increasingly offers interesting applications for chiral metallocene complexes of metals of III. - VI. Subgroup of the Periodic Table of the Elements. Examples include enantioselective hydrogenations of prochiral substrates, for example prochiral olefins, as described in R. Waymouth, P. Pino, J. Am. Chem. Soc. 112 (1990), pp. 4911-4914, or prochiral ketones, imines and oximes, as described in WO 92/9545.
• the meso form must first be separated off from the mixture of diastereomers (rac and meso forms) obtained in the prior art metallocene synthesis. Since the meso- Form must be discarded, the yield of racemic metallocene complex is low.
• the object of the present invention was therefore to find a process for the selective production of racemic, practically (NMR measurement accuracy) meso-isomer-free metallocene complexes.
• racemic metallocene complexes which can be used either directly as or in catalysts, primarily for olefin polymerization, or which, after modification, for example after the substitution of an "auxiliary ligand", or in catalysts, primarily for olefin polymerization, or which can be used as reagents or catalysts in stereoselective synthesis.
• racemic metallocene complexes III and their use as catalysts or in catalysts for the polymerization of olefinically unsaturated compounds or as reagents or catalysts in stereoselective synthesis have been found.
• the bridged or unbridged transition metal aromatic complexes according to the invention have the general formula I
• substituents and indices have the following meaning: M titanium, zirconium, hafnium, vanadium, niobium, tantalum,
• Ci- to Cio-alkyl Cg- to C ⁇ 5 aryl, alkylaryl with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, -OR 10 or -NR 10 R H ,
• n is an integer between 1 and 4, where n is the speed of Wertig ⁇ M corresponds to minus the number 2,
• Rl, R 8 the same or different fluorine, chlorine, bromine, iodine, Ci- to C 2 o "alkyl, 3- to 8-membered cycloalkyl - which in turn can carry a Ci- to Cio-alkyl as a residue -, Cg- bis Cis-aryl, alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, arylalkyl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, Si (R 9 ) With
• R 9 the same or different, Ci to C 2 o "alkyl, C 3 - to Cio" cycloalkyl, C 6 - to cis-aryl, where the radicals mentioned can be partially or completely substituted by heteroatoms,
• R 2 to R 7 are the same or different hydrogen, Ci to
• C 20 alkyl, 3- to 8-membered cycloalkyl - which in turn can carry a Ci- to Cio -alkyl radical -, C 5 - to -C 5 -aryl, alkylaryl with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 C.
• arylalkyl with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, Si (R 9 ) 3 with R 9, identical or different, to C 1 -C 0 -alkyl, C 3 - to C o -Cycloalkyl, C 6 - to cis-aryl, adjacent radicals R 2 to R 7 can for 4 to
• R i °, R ll Ci to Cio-alkyl Cg to C ⁇ 5 aryl, alkylaryl, aryl alkyl, fluoroalkyl or fluoroaryl, each with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, Y, ⁇ i the same or different
• R l identical or different hydrogen, halogen, Ci-Cio-alkyl, Ci-Cio-fluoroalkyl, C 6 -C ⁇ 0 -fluoroaryl, Cg-Cio-aryl, C ⁇ -C ⁇ 0 alkoxy, C 2 -Cio - alkenyl, C Are -C 40 arylalkyl, Cg -C40 arylalkenyl, C 7 -C40 alkylaryl, or where two radicals R i2 form a ring with the atoms connecting them,
• M l is silicon, germanium or tin and
• n 0, 1, 2, 3,
• Y is not bridging and represents two radicals R 'and R ", where
• Preferred metals M are titanium, zirconium and hafnium, especially 5 zirconium.
• substituents X are fluorine, chlorine, bromine, iodine, preferably chlorine, and further C 1 -C 6 -alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, i-butyl, preferably 0 tert-butyl.
• substituents X are alcoholates -OR 10 or amides -NR1 ° RH with R 10 or R 11 C x - to Cio-alkyl, Cg- to Cis-aryl, alkylaryl, arylalkyl, fluoroalkyl or fluoroaryl, each with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical.
• Such radicals X are, for example
• the substituents R 1 and R 8 are the same or different and are fluorine. Chlorine, bromine, iodine, C ⁇ to C 2 o ⁇ alkyl, 3- to
• cycloalkyl - which in turn can be a C ⁇ ⁇ to Cio-alkyl - rest, such as methyl, ethyl propyl.
• cycloalkyl radicals are cyclopropyl, cyclopentyl, preferably cyclohexyl, norbornyl.
• the substituents R 1 and R 8 are Cg to cis aryl, such as phenyl, naphthyl; Alkylaryl with 1 to
• 35 the trifluoromethyl, pentafluoroethyl, heptafluoropropyl, hepta-fluoroisopropyl, pentafluorophenyl group.
• Preferred substituents R 1 and R 8 are those which take up a lot of space. Such substituents are usually called 40 bulky substituents. They are characterized by the fact that they can cause steric hindrance.
• these groups are understood to mean carbon or silicon-organic residues with a high space requirement (bulky 45 residues), but also fluorine and preferably chlorine, bromine and iodine.
• the number of carbon atoms in such carbon or organosilicon residues are usually not less than three.
• Preferred non-aromatic, bulky residues are those carbon or organosilicon residues which are branched in the ⁇ position or higher position.
• examples of such radicals are branched C - to C 2 o-aliphatic, Cg- to C 2 o -aliphatic radicals and C 3 - to Cio-cycloaliphatic radicals, such as isopropyl, tert-butyl, isobutyl, neo-pentyl, 2-methyl-2-phenyl-propyl (neophyl), cyclohexyl, 1-methylcyclohexyl, bicyclo [2.2.1] - hept-2-yl (2-norbornyl), bicyclo [2.2.1] hept-1 -yl (1-norbornyl), adamantyl.
• organosilicon radicals having from three to thirty carbon atoms in question ⁇ example, trimethylsilyl, triethylsilyl, triphenylsilyl, tert-butyl - dimethylsily, tritolylsilyl or bis (trimethylsilyl) methyl.
• Preferred aromatic, bulky groups are generally Cg to C 2 o ⁇ aryl residues, such as phenyl, 1- or 2-naphthtyl or preferably C 1 ⁇ to Cio-alkyl or C 3 - to C o -cycloalkyl-substituted aromatic residues such as 2, 6-dimethylphenyl, 2, 6-di-tert. -Butylphenyl, mesityl.
• R 1 and R 8 are i-propyl, tert-butyl, trimethylsilyl, cyclohexyl, i-butyl, trifluoromethyl, 3, 5-dimethylphenyl.
• R 1 and R 8 in formula I are the same.
• the substituents R 2 to R 7 are the same or different and are hydrogen, C 1 -C 2 -alkyl, 3- to 8-membered cycloalkyl - which in turn carry a C 1 -C 8 -alkyl radical, such as methyl, ethyl, propyl can.
• Examples of such cycloalkyl radicals are cyclopropyl, cyclopentyl, preferably cyclohexyl, norbornyl.
• substituents R 2 to R 7 are Cg to C 5 aryl, such as phenyl, naphthyl, alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, such as p-tolyl, arylalkyl with 1 up to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, such as benzyl, neophyl or they mean triorganosilyl such as Si (R 9 ) 3 with R 9 identical or different C ⁇ ⁇ to C 2 o-alkyl, C 3 - to Cio-cycloalkyl, Cg- to cis-aryl, for example trimethylsilyl, tert-butyldimethylsilyl, triphenylsilyl.
• aryl such as phenyl, naphthyl, alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to
• the radicals R 2 to R 7 can, however, also be linked to one another in such a way that adjacent radicals stand for saturated, partially saturated or unsaturated cyclic groups having 4 to 15 carbon atoms.
• the radicals R 3 and R 4 and / or the radicals R 5 and R 6 are preferably connected to a C 2 bridge in such a way that a benzo-fused one Ring system (naphthyl derivative) is formed.
• the radicals R 2 to R 7 mentioned can of course also be partially or completely substituted with heteroatoms, for example with structural elements containing S, N, 0 or halogen atoms.
• the trifluoromethyl, pentafluoroethyl, heptafluoropropyl, heptafluoroisopropyl, pentafluorophenyl group may be mentioned as examples of such substituted radicals R 2 to R 7 .
• radicals R 2 and R 7 are particularly preferably the same and are hydrogen and R 3 , R 4 , R 5 , R 6 have the meaning already mentioned.
• bridge members Y, Y 1 The following can be considered as bridge members Y, Y 1 :
• R 12 are the same or different and are a hydrogen atom, a halogen atom, a C ⁇ -C ⁇ o-alkyl group, a C ⁇ -C ⁇ o-fluoroalkyl group, a Cg-Cio-fluoroaryl group, a Cg-Cio-aryl group, a Ci-Cio-alkoxy group, a C2 -C ⁇ o alkenyl group, a C 7 -C o arylalkyl group, a C 8 -C 4 0 -arylalkenyl group or a C 7 -C 40 alkyl - aryl group, or R 12 and R i3 i2 or R and R i4 each case with the connecting atoms form a ring,
• M x is silicon, germanium or tin.
• Preferred bridge members Y, ⁇ i are methylene -CH 2 -, S, 0,
• de ⁇ NEN Y represents radicals R 'and R ", which are identical or different and are fluorine, chlorine, bromine, iodine, Ci to C 20 alkyl or 3- to 8-membered cycloalkyl - which in turn rest a Ci to Cio alkyl ⁇ such as methyl, ethyl, propyl may carry -.
• cycloalkyl radicals are cyclopropyl, cyclopentyl, preferably cyclohexyl, norbornyl Furthermore, the substituents.
• R 'and R "Cg to cis aryl such as phenyl, naphthyl; Alkylaryl having from 1 to 10 carbon atoms in the alkyl radical and 6 to 20 C-Ato ⁇ men in the aryl radical, such as p-tolyl; Arylalkyl with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, such as benzyl, neophyl or they mean triorganosilyl such as Si (R 9 ) 3 with R 9, identical or different Ci to C 2 o "alkyl, C 3 - to Cio-cycloalkyl, Cg- to cis-aryl, for example trimethylsilyl, tert-butyldimethylsilyl, triphenylsilyl.
• radicals mentioned can of course also be partially or completely substituted with heteroatoms, for example with S-, N-, 0-, or structural elements containing halogen atoms.
• substituted radicals R 'and R are the trifluoromethyl, pentafluoroethyl, heptafluoropropyl, heptafluoroisopropyl and pentafluorophenyl groups.
• R 'and R " are particularly preferably the same.
• Very particularly preferred unbridged transition metal aromatic complexes are those in which R 1 , R 8 , R' and R" are the same.
• bridged or non-bridged transition metal aromatic complexes I are generally prepared by methods which are known to the person skilled in the art.
• the biphenol is first deprotonated in a solvent, for example tetrahydrofuran (THF), for example with sodium hydride or n-butyllithium, and then the transition metal compound, for example the halide, such as titanium, zirconium or hafnium tetrachloride, advantageously in the form of the bis- THF adduct added.
• a solvent for example tetrahydrofuran (THF)
• the transition metal compound for example the halide, such as titanium, zirconium or hafnium tetrachloride
• the product is usually obtained after removal of salts by crystallization.
• the production of non-bridged transition metal phenolate complexes can, for example, according to H. Yasuda et. al, J. Organomet. Chem. 473 (1994), pages 105 to 116.
• the bridged or non-bridged transition metal aromatic complexes I according to the invention generally still contain 2 to 4 equivalents of a Lewis base, which is generally introduced via the synthetic route.
• Lewis bases include ethers, such as diethyl ether or tetrahydrofuran (THF).
• ethers such as diethyl ether or tetrahydrofuran (THF).
• THF tetrahydrofuran
• the racemic metallocene complexes according to the invention are prepared by reacting the bridged or non-bridged transition metal aromatic complexes I with cyclopentadienyl derivatives of the alkali or alkaline earth metals.
• Transition metal aromatic complexes I in which M is zirconium and the radicals R 1 and R 8 have the preferred meaning described above are preferably used.
• Very suitable are dichlorobis (6 - tert butyl methyl -4 -. Phenoxy) zirconium • (THF> 2 and mentioned in the examples zirconium kon phenolate compounds.
• cyclopentadienyl derivatives of the alkali or alkaline earth metals are those which, after the reaction with the bridged transition metal aromatic complexes I according to the invention, provide selective, practically meso-isomer-free, racemic metallocene complexes.
• the racemic metallocene complexes according to the invention can be bridged, but need not be. It is generally sufficient to have a high rotation barrier, in particular in the temperature range from 20 to 80 ° C (determinable with the method of X H and / or i3 C NMR spectroscopy) of the unbridged cyclopentadienyl-type ligands in the metallocene, so that the metallocene complexes, directly in their racemic form can be isolated without being able to convert into the meso form.
• the rotation barrier that ensures this is usually above 20 kJ / mol.
• Cyclopentadiene derivatives of alkali or alkaline earth metals which are particularly suitable are those of the general formula II
• R 13 i s Rl7 the same or different, hydrogen, C 1 -C 2 -alkyl, 5- to 7-membered cycloalkyl, which in turn may have a C 1 -C 10 -alkyl substituent, C 1 -C 10 -aryl or arylalkyl, where adjacent residues together can represent cyclic groups having 4 to 15 carbon atoms, or Si (R 18 ) 3 with
• R 18 the same or different C ⁇ to Cio-alkyl, Cg to C ⁇ 5 aryl or C 3 - to Cio-cycloalkyl,
• R i9 to R 23 are the same or different hydrogen, C ⁇ ⁇ to C 2 o ⁇ alkyl, 5- to 7-membered cycloalkyl, which in turn can carry a C ⁇ ⁇ to Cio-alkyl as a substituent, are Cg to Cis aryl or arylalkyl , where adjacent radicals together can represent cyclic groups having 4 to 15 carbon atoms, or Si (R 24 ) 3 with
• R 24 the same or different Ca ⁇ to Cio-alkyl, Cg to C ⁇ aryl or C 3 - to CiQ-cycloalkyl,
• R i6 and Z together form a grouping - [T (R 25 ) (R 6 )] n -E- in which T can be the same or different and stands for silicon, germanium, tin or carbon.
• NR 27 or PR 27 means
• R 27 the same or different C ⁇ ⁇ bi s Cio-alkyl, Cg- bi s Cis-aryl, C 3 - bi s Cio-cycloalkyl, alkylaryl or
• Ci to Cio alkyl Cg to Cis aryl, C 3 to Cio cycloalkyl or alkylaryl,
• Preferred compounds of the formula II are those in which M 2 is lithium, sodium and in particular magnesium. Furthermore, such compounds of the formula II a)
• M 2 is magnesium
• R x7 and R 23 are different substituents from hydrogen, such as C ⁇ ⁇ bis
• Cio-alkyl that is methyl, ethyl, n-propyl, i-propyl, n-butyl, sec-butyl, tert-butyl, i.-butyl, hexyl, furthermore C 6 -C ⁇ 0 aryl, such as Phenyl or trialkylsilyl, such as trimethylsilyl, T (R 25 R 26 ) for bis-C ⁇ -C ⁇ o-alkylsilyl or bis-Cg-Cio-arylsilyl, such as dimethylsilyl, diphenylsilyl, furthermore for 1, 2-ethylandiyl, methylene and the radicals R i3 to R i5 and R i9 to R 25 have the meaning already mentioned and in particular form an indenyl-type ring system or a benzoindenyl-type ring system.
• Such alkali or alkaline earth metal compounds II can be obtained by methods known from the literature, for example by the, preferably stoichiometric, reaction of an organometallic compound or a hydride of the alkali metal or alkaline earth metal with the corresponding cyclopentadienyl-type hydrocarbon.
• Suitable organometallic compounds are, for example, n-butyl lithium or di-n-butyl magnesium.
• Alkali or alkaline earth metals preferably of the formulas II or Ha
• Alkali or alkaline earth metals are usually found in an organic solution or pensionsstoff, preferably in an ether such as diethyl ether, THF and in the temperature range from - 78 to 100 ° C, preferably in the temperature range from 0 to 60 ° C instead.
• the molar ratio of the transition metal aromatic complex I to the cyclopentadienyl derivative of alkali or alkaline earth metals is usually in the range from 0.8: 1 to 1: 1.2, preferably 1: 1.
• racemic metallocene complexes according to the invention are preferably those of the general formula III
• R 1 , R 8 are identical or different fluorine, chlorine, bromine, iodine, Ci to C 20 "alkyl, 3- to 8-membered cycloalkyl - which in turn can carry a Ci to Cio-alkyl as a residue -, Cg- bis Cis-aryl, alkylaryl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, arylalkyl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical, Si (R 9 ) 3 with R 9, the same or different, Ci to C 20 alkyl, C 3 to Cio cycloalkyl, C 6 to Cis aryl, where the radicals mentioned can be partially or completely substituted with heteroatoms, R 2 to R 7 are the same or different hydrogen, Ci to
• C 20 "alkyl, 3- to 8-membered cycloalkyl - which in turn can carry a Ci to Cio-alkyl radical -, Cg to Cis-aryl, alkylaryl with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, arylalkyl with 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, Si (R 9 ) 3 with R 9, identical or different, to C 1 -C 2 -alkyl, C 3 - to C ⁇ 0 -Cycloalkyl, Cg- to cis-aryl, adjacent radicals R 2 to R 7 can for 4 to
• R 12 the same or different hydrogen, halogen,
• M i is silicon, germanium or tin and
• n 0, 1, 2, 3, or Y is not bridging and represents two radicals R 'and R ", where
• R 'and R are the same or different and are hydrogen, fluorine, chlorine, bromine, iodine, C 1 - to C 2 o-alkyl, 3- to
• R i3 to R i7 are the same or different hydrogen, C ⁇ ⁇ to C 2 o ⁇ alkyl, 5- to 7-membered cycloalkyl, - which in turn can carry a C ⁇ ⁇ to Cio-alkyl as a substituent -, Cg- to cis-aryl or Arylalkyl, where adjacent radicals together can represent cyclic groups having 4 to 15 carbon atoms, or Si (R i8 ) 3 with
• R X8 the same or different C ⁇ ⁇ to Cio-alkyl, Cg- bis
• R i9 to R 23 are the same or different hydrogen, -C ⁇ to C 20 "alkyl, 5- to 7-membered cycloalkyl, - which in turn can carry a -C ⁇ to Cio-alkyl as a substituent -, Cg to C ⁇ 5 aryl or Arylalkyl mean, where adjacent radicals may together represent cyclic groups having 4 to 15 carbon atoms, or Si (R 24 ) 3 with R 24 identical or different C ⁇ ⁇ to Cio-alkyl, Cg- bis
• R 16 and Z together form a grouping - [T (R 25 ) (R 26 )] q -E- in which
• T can be the same or different and represents silicon, germanium, tin or carbon
• R 25 R 26 for hydrogen, C x - to Cio-alkyl, C 3 - to C ⁇ 0 cycloalkyl or Cg- to cis-aryl
• NR 27 or PR 27 means.
• R 27 the same or different C ⁇ ⁇ to Cio-alkyl, Cg- to Cis-aryl, C 3 - to Cio-cycloalkyl, alkylaryl or Si ( R 28 ) 3rd
• R 28 the same or different Ci- to Cio-alkyl, Cg- to Cis-aryl, C 3 - to Cio-cycloalkyl or alkylaryl.
• Preferred compounds of the formula III are those in which M denotes titanium, hafnium and in particular zirconium.
• bridged compounds of the formula III are particularly preferred (ansa-metallocenes) in which R i7 and R 23 denote substituents other than hydrogen, such as C 1 to C 10 -alkyl, that is to say methyl, ethyl, n-propyl, i-propyl, n- Butyl, sec.-butyl, tert.-butyl, i.-butyl, hexyl, furthermore C6-C ⁇ o-aryl, such as phenyl or trialkylsilyl, such as trimethylsilyl, T (R 25 R 26 ) for bis-C ⁇ -C ⁇ 0 -alkylsilyl or bis-Cg-Cio -arylsilyl is like dimethylsilyl, diphenylsilyl, furthermore for 1,2-ethanediyl, methylene and
• racemic metallocene complexes preferably those of the general ⁇ my formula III, can in general be further modifizie ⁇ ren.
• Another well-suited substitution process is the reaction of the racemic metallocene complexes, preferably those of the general formula III with organo-aluminum compounds such as tri-Ci to C ⁇ o ⁇ alkyl aluminum, that is trimethyl aluminum, triethyl aluminum, tri-butyl aluminum, tri-iso -butyl aluminum.
• ligand X 1 in complex III is two non-bridged phenolate ligands.
• the components are usually used in a stoichiometric ratio.
• the cleavage reactions generally take place while maintaining the stereochemistry of the metallocene complexes, which means that there is generally no conversion of the racemic form into the meso form of the metallocene complexes.
• the process according to the invention is distinguished in that it makes the racem form of metallocene complexes very selectively accessible.
• Bridged indenyl or benzoindenyl type metallocenes which are in the vicinity can be obtained particularly advantageously of the bridge member (so-called 2-position) have a ligand other than hydrogen.
• racemic metallocene complexes of the present invention can be used as catalysts or in catalyst systems for the polymerization of olefinically unsaturated compounds such as ethylene, propylene, 1- Use butene, 1-hexene, 1-octene, styrene. They are particularly advantageous in the stereoselective polymerization of prochiral, olefinically unsaturated compounds, such as propylene and styrene.
• Suitable catalysts or catalyst systems in which the racemic metallocene complexes according to the invention can act as a "metallocene component" are usually contained by means of compounds which form metallocenium ions, as for example in EP-A-0 700 935, page 7, line 34 to page 8, line 21 and formulas ( IV) and (V) described.
• Other metallocenium ion-forming compounds are alumoxane (RA10) n such as methylaluminoxane.
• racemic metallocene complexes according to the invention in particular those of the general formula III or their derivatives, which have already been described and can be obtained, for example, by splitting off the phenolate ligands, can furthermore be used as reagents or as catalysts or in catalyst systems in stereoselective, in particular organic, synthesis.

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• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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• 1997
  • 1997-09-23 DE DE19741876A patent/DE19741876A1/de not_active Withdrawn
• 1998
  • 1998-09-17 ES ES98948986T patent/ES2192791T3/es not_active Expired - Lifetime
  • 1998-09-17 JP JP2000512843A patent/JP4360754B2/ja not_active Expired - Lifetime
  • 1998-09-17 EP EP98948986A patent/EP1017702B1/de not_active Expired - Lifetime
  • 1998-09-17 BR BR9812084-0A patent/BR9812084A/pt not_active Application Discontinuation
  • 1998-09-17 CN CNB988094266A patent/CN1220694C/zh not_active Expired - Lifetime
  • 1998-09-17 US US09/508,970 patent/US6262286B1/en not_active Expired - Lifetime
  • 1998-09-17 DE DE59807204T patent/DE59807204D1/de not_active Expired - Lifetime
  • 1998-09-17 KR KR1020007003040A patent/KR20010024225A/ko not_active Withdrawn
  • 1998-09-17 WO PCT/EP1998/005918 patent/WO1999015538A1/de not_active Ceased
  • 1998-09-17 AT AT98948986T patent/ATE232538T1/de not_active IP Right Cessation

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