WO1998006759A1 - Group iv zwitterion ansa metallocene (zam) catalysts for alpha-olefin polymerization - Google Patents

Group iv zwitterion ansa metallocene (zam) catalysts for alpha-olefin polymerization Download PDF

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WO1998006759A1
WO1998006759A1 PCT/US1997/013793 US9713793W WO9806759A1 WO 1998006759 A1 WO1998006759 A1 WO 1998006759A1 US 9713793 W US9713793 W US 9713793W WO 9806759 A1 WO9806759 A1 WO 9806759A1
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group
substituted
unsubstituted
aryl
alkyl
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WO1998006759A9 (en
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William A. Goddard, Iii
Christopher G. Brandow
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California Institute Of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
    • B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22—Organic complexes
    • B01J31/2282—Unsaturated compounds used as ligands
    • B01J31/2295—Cyclic compounds, e.g. cyclopentadienyls
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/30—Complexes comprising metals of Group III (IIIA or IIIB) as the central metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/40—Complexes comprising metals of Group IV (IVA or IVB) as the central metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/40—Complexes comprising metals of Group IV (IVA or IVB) as the central metal
    • B01J2531/48—Zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/50—Complexes comprising metals of Group V (VA or VB) as the central metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/60—Complexes comprising metals of Group VI (VIA or VIB) as the central metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/12—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides
    • B01J31/14—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides of aluminium or boron
    • 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
    • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/02—Ethene
    • 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
    • C08F2420/00—Metallocene catalysts
    • C08F2420/08—Heteroatom bridge, i.e. Cp or analog where the bridging atom linking the two Cps or analogs is a heteroatom different from Si
    • 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
    • C08F4/00—Polymerisation catalysts
    • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62—Refractory metals or compounds thereof
    • C08F4/639—Component covered by group C08F4/62 containing a transition metal-carbon bond
    • C08F4/63908—Component covered by group C08F4/62 containing a transition metal-carbon bond in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+

Definitions

  • ZAM Zinc Ansa Metallocene
  • the present invention generally relates to olefin polymerization catalysts, and more specifically to single component metallocene catalysts for ⁇ -olefin polymerization.
  • catalysts require an anionic co-catalyst (or a catalyst activator) , typically perfluorophenylborates or methyl aluminoxane (MAO) , to generate the catalytically active cationic fourteen electron d° species .
  • anionic co-catalyst typically perfluorophenylborates or methyl aluminoxane (MAO)
  • MAO-based systems predominate in industrial applications.
  • MAO must be present in large molar excess (200-2000 times that of the metallocene catalyst) , its presence accounts for over 50% of the cost of the catalytic system. In addition to the increased expense, little is known about MAO's structure or role in the polymerization reaction. Moreover, because MAO may also provide an additional route for chain termination (via chain transfer to the trimethyl aluminum) , this complicates the design of more selective catalysts.
  • Another approach is to incorporate a counter anion for a Group IV catalyst directly into the ligand.
  • Jordan, et al . (Crowther, et al . , J. Am. Chem. Soc . 113:1455 (1991)) prepared catalyst in which one cyclopentadienyl (Cp) ligand is replaced by a dianionic dicarbolide ligand.
  • Cp cyclopentadienyl
  • the resulting complex was expected to be capable of ⁇ -olefin polymerization.
  • these complexes readily undergo ⁇ - elimination, have low activity, and only oligomerize polypropylene.
  • Figure 1 illustrates the result of energy calculations comparing a zwitterion ansa metallocene (ZAM) catalyst with a standard Ziegler-Natta catalyst for each step of olefin polymerization.
  • ZAM zwitterion ansa metallocene
  • Figure 2 illustrates transition state enthalpies for two ZAM catalysts and a standard Ziegler-Natta catalyst .
  • ZAM zwitterion ansa metallocene
  • M is selected from a group consisting of Group III, Group IV, Group V, and Group VI elements;
  • E is boron or aluminum;
  • R-_ and R 2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C ⁇ to C 10 alkyl, substituted or unsubstituted to C 6 to C 15 aryl, and substituted and unsubstituted C to C 10 alkoxy;
  • Ri ⁇ are eacn independently selected from a group consisting of hydrogen, substituted or unsubstituted C to C 10 alkyl, substituted or unsubstituted to C 10 alkoxy, substituted or unsubstituted C 6 to C 15 aryl, substituted or unsubstituted C 3 to C 10 cycloalkyl, and Si(R 12 ) 3 where R 12 is selected from the group consisting of C x to C 10 alkyl, C 6 to C 15 aryl, or C 3 to C 10 cycloalkyl; and,
  • R 7 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl , hydride, and Si(R 13 ) 3 where R 13 is selected from a group consisting of C ⁇ to C 10 alkyl, C 6 to C 15 aryl, and C 3 to C 10 cyclolalkyl .
  • each pair of adjacent radicals on the cyclopentadienyl rings (e.g., R 4 and R 5 or R 10 and R ⁇ ⁇ ) together may also form a cyclic group having 4 to 15 carbon atoms which in turn may be further substituted.
  • M is a Group IV metal
  • R x and R 2 are each an electron withdrawing group
  • R 3 , R 4 , R 5 , R 6 , R 8 , R 9 , R 10 , and R l ⁇ are each selected from a group consisting of hydrogen, methyl, isopropyl, tert-butyl and trimethylsilyl .
  • M is zirconium.
  • the invention further includes a efhod for polymerizing olefins comprising the step of contacting an olefin with a catalyst of the type described above.
  • the olefin may be a C 3 -C 10 ⁇ -olefin, and the olefin may be contacted with the catalyst in the presence of a solvent .
  • the catalysts of the present invention are zwitterion ansa metallocenes that are referred to as ZAM catalysts.
  • the inventive catalysts eliminates the need for a counterion like MAO while retaining or improving most of the various kinetic steps in olefin polymerization over prior art Ziegler-Natta catalysts.
  • ZAM catalysts are of the general formula:
  • M is selected from a group consisting of Group III, Group IV, Group V, and Group VI elements;
  • E is boron or aluminum;
  • R ⁇ and R 2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C 1 to C 10 alkyl, substituted or unsubstituted to C 6 to C 15 aryl, and substituted and unsubstituted C 1 to C 10 alkoxy;
  • R ⁇ are eacn independently selected from a group consisting of hydrogen, substituted or unsubstituted C 2 to C 10 alkyl, substituted or unsubstituted C ⁇ to C 10 alkoxy, substituted or unsubstituted C 6 to C 15 aryl, substituted or unsubstituted C 3 to C 10 cycloalkyl, and Si(R 12 ) 3 where R 12 is selected from the group consisting of C x to C 10 alkyl, C 6 to C 15 aryl, or C 3 to C 10 cycloalkyl; and, R 7 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl, hydride, and Si(R 13 ) 3 where R 13 is selected from a group consisting of C x to C 10 alkyl, C 6 to C 15 aryl, and C 3 to C 10 cycl
  • each pair of adjacent radicals on the cyclopentadienyl rings may also form a cyclic group having 4 to 15 carbon atoms which in turn may be further substituted.
  • Examples of compounds wherein one or more pairs of adjacent radicals form cyclic ring include but are not limited to:
  • R-_ and R 2 are each a group which increases the electrophilicity of the metal center.
  • suitable groups include but are not limited to F, C 6 F 5 , and CF 3 .
  • M is a Group IV metal
  • R 3 , R 4 , R 5 , R 6 , R E R g , R 10' and R 12 are each selected from a group consisting of hydrogen, methyl, isopropyl, tert-butyl and trimethylsilyl .
  • M is zirconium.
  • E is boron or aluminum
  • R x and R 2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C-_ to C 10 alkyl, substituted or unsubstituted to C 6 to C 15 aryl, and substituted and unsubstituted C x to C 10 alkoxy;
  • R 3 , R 4 , R 5 , and R 6 are each independently selected from a group consisting of hydrogen, substituted or unsubstituted C to C 10 alkyl, substituted or unsubstituted C to C 10 alkoxy, substituted or unsubstituted C 6 to C 15 aryl, substituted or unsubstituted C 3 to C 10 cycloalkyl, and Si(R 9 ) 3 where R 9 is selected from the group consisting of ⁇ to C 10 alkyl, C 6 to C 15 aryl, or C 3 to C 10 cycloalkyl, wherein each pair of adjacent radicals together also may form a substituted or unsubstituted cyclic group having 4 to 15 carbons;
  • R 7 is selected from a group consisting of hydrogen, substituted or unsubstituted C x to C 10 alkyl, substituted or unsubstituted C to C 10 alkoxy, substituted or unsubstituted C 6 to C 15 aryl, substituted or unsubstituted C 3 to C 10 cycloalkyl, and Si(R 10 ) 3 where R 10 is selected from the group consisting of C to C 10 alkyl, C 6 to C 15 aryl, or C 3 to C 10 cycloalkyl; and,
  • R 8 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl , hydride, and Si(R 11 ) 3 where R ⁇ is selected from a group consisting of C x to C 10 alkyl, C 6 to C 15 aryl, and C 3 to C 10 cyclolalkyl .
  • R 7 is tert-butyl or trimethyl-silyl .
  • These compounds are variations of traditional metallocene catalysts and are generally referred to as mono-Cp "constrained- geometry catalysts" (or CGC) .
  • CGC constrained- geometry catalysts
  • the invention further includes a method for polymerizing olefins comprising the step of contacting an olefin with a catalyst of the types described above.
  • the olefin may be a C 3 -C 10 ⁇ -olefin, and the olefin may be contacted with the 'catalyst in the presence of a solvent .
  • the constrained-geometry embodiment of the present invention may be synthesized by known methods in the art, including but not limited to the protocol described by Organome tallies, 9: 866-869 (1990) which is incorporated herein by reference.
  • the metallocene catalysts of the present invention may also be prepared by a variety of methods known in the art including the protocol described below. Although the protocol is for the preparation of (C 6 F 5 ) 2 B (C 5 H 4 ) 2 ZrCH 3 , persons skilled in the art would readily know how to adapt the protocol for the various inventive embodiments.
  • THF tetrahydrofuran
  • Density Functional Theory (DFT) calculations were carried out using the PS-GVB-DFT program. Ringnalda, et al . , PS-GVB, 2.3 Schr ⁇ dinger, Inc. 1996; Slater, J. C. , Quantum Theory of Molecules and Solids, vol , 4 . The Self -Consistent Field for Mol ecules and Solids (McGraw-Hill, New York, 1974) ; and Perdew, J. P. Electronic Structure Theory of Solids, Ziesche, P. & Eschrig, H. eds. (Akademie Verlag, Berlin, 1991) .
  • the Zr was described with the LACVP Hay adt effective core potential (ECP) to replace the core electrons [leaving the (4s) 2 (4p) 6 [ (4d) (5s) (5p)] 4 electrons to be described explicitly] and using the standard double zeta contraction.
  • ECP effective core potential
  • the results of the insertion reaction are summarized in Figure 1 which displays the energies along the reaction coordinates for ZAM I and control II.
  • Figure 1 illustrates, the standard cationic metallocene binds ethylene exothermically by approximately 23 kcal/mol while the corresponding ZAM binds exothermically by about 16 kcal/mol.
  • the insertion barrier for the cationic metallocene ranges from about 6-10 kcal/mol while ZAM has an insertion barrier of just less than 3 kcal/mol.
  • the remaining energies of the ZAM catalyst were consistent with the energies of the cationic catalyst at the same level of theory.
  • the energetics for the insertion reaction for ZAM I, ZAM III and control II are summarized in figure 2.
  • the results for ZAM I and control II were calculated using DLDA-B3LYP and are consistent with the results using NLDA-GGAII.

Abstract

Single component metallocene catalysts for α-olefin polymerization are disclosed. Prior art cation metallocene catalysts have required a separate anion co-catalyst like methyl aluminoxane (MAO). However, because the inventive zwitterion ansa metallocene (ZAM) catalysts have a 'built-in' anion co-catalyst functionality, the need for a separate anion co-catalyst is eliminated.

Description

PATENT APPLICATION
Group IV Zwltterion Ansa Metallocene (ZAM) Catalysts For Alpha-Olefin Polymerization
FIELD OF THE INVENTION
The present invention generally relates to olefin polymerization catalysts, and more specifically to single component metallocene catalysts for α-olefin polymerization.
This application claims the benefit of U.S. Provisional Application No. 60/024,395 filed August 9, 1996 which is incorporated herein by reference. The U.S. Government has certain rights in this invention pursuant to Grant NO. CHE- 9522179 awarded by the National Science Foundation.
BACKGROUND OF THE INVENTION
Polymers made by metallocene catalysts are gaining an increasing share of the worldwide plastics market. Many of these industrial catalysts are Kaminsky type ansa-metallocenes derived from 1.
Figure imgf000003_0001
These catalysts require an anionic co-catalyst (or a catalyst activator) , typically perfluorophenylborates or methyl aluminoxane (MAO) , to generate the catalytically active cationic fourteen electron d° species .
Of the two classes of co-catalysts, MAO-based systems predominate in industrial applications.
Because MAO must be present in large molar excess (200-2000 times that of the metallocene catalyst) , its presence accounts for over 50% of the cost of the catalytic system. In addition to the increased expense, little is known about MAO's structure or role in the polymerization reaction. Moreover, because MAO may also provide an additional route for chain termination (via chain transfer to the trimethyl aluminum) , this complicates the design of more selective catalysts.
As a result, there have been many attempts to modify the Group IV metallocene based catalytic system to eliminate the need for MAO. Although perfluorophenylborates (i.e., perfluorinated tetra- alkyl borates) may be substituted as the co-catalyst, their thermal instability and extreme sensitivity to oxygen make them impractical for large scale industrial applications.
An attractive alternative is to design a single component Ziegler Natta catalyst that does not require any co-catalyst. One such attempt is Bercaw' s series of iso-electronic Group III neutral metallocenes such as 2 (Burger, et al . , Am . Chem . Soc. 112:1566 (1990)). Although Bercaw' s catalysts have been enormously useful in elucidating the basic processes involved in olefin polymerization, they are of limited use in industrial applications because of their low polymerization activity.
Figure imgf000005_0001
Another approach is to incorporate a counter anion for a Group IV catalyst directly into the ligand. In one attempt, Jordan, et al . (Crowther, et al . , J. Am. Chem. Soc . 113:1455 (1991)) prepared catalyst in which one cyclopentadienyl (Cp) ligand is replaced by a dianionic dicarbolide ligand. As a neutral d° species, the resulting complex was expected to be capable of α-olefin polymerization. Unfortunately, these complexes readily undergo β- elimination, have low activity, and only oligomerize polypropylene. The polarization of the dicarbolide- zirconium bond is believed to result in a more neutral metal center which makes the initial binding of the propylene less exothermic and the insertion into the Zr-R bond more disfavored since the Zr orbital would be less d-like. An attempt using a trimethylene methane ligand instead of the dicarbolide ligand also produced similar results (Rodriquez G. & Bazan G. C, J". Am. Chem. Soc . 113:1455 (1991) ) . Consequently, a need exists for a single component Ziegler-Natta catalysts that is comparable to Kaminsky type ansa-metallocenes but without the need for a co-catalyst like MAO.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates the result of energy calculations comparing a zwitterion ansa metallocene (ZAM) catalyst with a standard Ziegler-Natta catalyst for each step of olefin polymerization.
Figure 2 illustrates transition state enthalpies for two ZAM catalysts and a standard Ziegler-Natta catalyst .
SUMMARY OF THE INVENTION
A single component neutral zwitterion ansa metallocene (ZAM) catalysts are disclosed. In embodiment of the inventive catalysts, compounds are of the general formula :
Figure imgf000006_0001
wherein M is selected from a group consisting of Group III, Group IV, Group V, and Group VI elements; E is boron or aluminum;
R-_ and R2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted Cλ to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted C to C10 alkoxy;
3 ' 4 ' 5 ' 6 ' 8 ' 9 ' lo ' and Ri ι are eacn independently selected from a group consisting of hydrogen, substituted or unsubstituted C to C10 alkyl, substituted or unsubstituted to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R12)3 where R12 is selected from the group consisting of Cx to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl; and,
R7 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl , hydride, and Si(R13)3 where R13 is selected from a group consisting of Cλ to C10 alkyl, C6 to C15 aryl, and C3 to C10 cyclolalkyl .
Moreover, each pair of adjacent radicals on the cyclopentadienyl rings (e.g., R4 and R5 or R10 and Rι τ ) together may also form a cyclic group having 4 to 15 carbon atoms which in turn may be further substituted.
Preferably, M is a Group IV metal; Rx and R2 are each an electron withdrawing group; and R3, R4 , R5, R6, R8, R9, R10, and Rlλ are each selected from a group consisting of hydrogen, methyl, isopropyl, tert-butyl and trimethylsilyl . In especially preferred embodiments, M is zirconium. The invention further includes a efhod for polymerizing olefins comprising the step of contacting an olefin with a catalyst of the type described above. The olefin may be a C3-C10 α-olefin, and the olefin may be contacted with the catalyst in the presence of a solvent .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The catalysts of the present invention are zwitterion ansa metallocenes that are referred to as ZAM catalysts. The inventive catalysts eliminates the need for a counterion like MAO while retaining or improving most of the various kinetic steps in olefin polymerization over prior art Ziegler-Natta catalysts.
In one embodiment, ZAM catalysts are of the general formula:
Figure imgf000008_0001
wherein
M is selected from a group consisting of Group III, Group IV, Group V, and Group VI elements; E is boron or aluminum; Rχ and R2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted C1 to C10 alkoxy;
3 ' 4 ' 5 ' 6 ' Θ ' ' lo ' and Rτι are eacn independently selected from a group consisting of hydrogen, substituted or unsubstituted C2 to C10 alkyl, substituted or unsubstituted Cχ to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R12)3 where R12 is selected from the group consisting of Cx to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl; and, R7 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl, hydride, and Si(R13)3 where R13 is selected from a group consisting of Cx to C10 alkyl, C6 to C15 aryl, and C3 to C10 cyclolalkyl .
Moreover, each pair of adjacent radicals on the cyclopentadienyl rings (e.g., R4 and R5 or R10 and R12) together may also form a cyclic group having 4 to 15 carbon atoms which in turn may be further substituted. Examples of compounds wherein one or more pairs of adjacent radicals form cyclic ring include but are not limited to:
Figure imgf000010_0001
In preferred embodiments, R-_ and R2 are each a group which increases the electrophilicity of the metal center. Illustrative examples of suitable groups include but are not limited to F, C6F5, and CF3. It is also preferred that M is a Group IV metal , and R3 , R4 , R5 , R6 , RE Rg , R 10' and R12 are each selected from a group consisting of hydrogen, methyl, isopropyl, tert-butyl and trimethylsilyl . In especially preferred embodiments, M is zirconium.
Another embodiment of the present invention are compounds of the general formula:
Figure imgf000011_0001
wherein
E is boron or aluminum;
Rx and R2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C-_ to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted Cx to C10 alkoxy;
R3, R4, R5, and R6 are each independently selected from a group consisting of hydrogen, substituted or unsubstituted C to C10 alkyl, substituted or unsubstituted C to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R9)3 where R9 is selected from the group consisting of ^ to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl, wherein each pair of adjacent radicals together also may form a substituted or unsubstituted cyclic group having 4 to 15 carbons;
R7 is selected from a group consisting of hydrogen, substituted or unsubstituted Cx to C10 alkyl, substituted or unsubstituted C to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R10)3 where R10 is selected from the group consisting of C to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl; and,
R8 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl , hydride, and Si(R11)3 where R ι is selected from a group consisting of Cx to C10 alkyl, C6 to C15 aryl, and C3 to C10 cyclolalkyl .
In preferred compounds of this embodiment, R7 is tert-butyl or trimethyl-silyl . These compounds are variations of traditional metallocene catalysts and are generally referred to as mono-Cp "constrained- geometry catalysts" (or CGC) . Compounds where E = Si were one of the first single-site catalysts to be developed and are used to produce polymers which posesess desirable strength properties while still allowing for easy processibility. Based upon energy calculations for single component metallocene catalysts, it is believed that these compounds would similarly display catalytic activity without the need for a co-catalyst.
The invention further includes a method for polymerizing olefins comprising the step of contacting an olefin with a catalyst of the types described above. The olefin may be a C3-C10 α-olefin, and the olefin may be contacted with the 'catalyst in the presence of a solvent .
The constrained-geometry embodiment of the present invention may be synthesized by known methods in the art, including but not limited to the protocol described by Organome tallies, 9: 866-869 (1990) which is incorporated herein by reference.
The metallocene catalysts of the present invention may also be prepared by a variety of methods known in the art including the protocol described below. Although the protocol is for the preparation of (C6F5) 2B (C5H4) 2ZrCH3, persons skilled in the art would readily know how to adapt the protocol for the various inventive embodiments.
(C6F5)2BC1 is mixed with two equivalents of
Li (C5H4) Sn (CH3) 3 and condensed with diethyl ether at -78°C. The mixture is slowly warmed to room temperature and allowed to stir overnight. ZrCl4 in toluene is slowly added and allowed to stir overnight at 80°C. The product is extracted from LiCl by rinsing with toluene or crashing out LiCl from the tetrahydrofuran (THF) solution with toluene, thus leaving the ligand in solution.
As illustrated by the synthetic scheme, (C6F5)2B(C5H4)2ZrCH3 is prepared by treating
(C6F5) 2B (C5H4) 2ZrCl2 with two equivalents of LiCH3 followed by [B(C6F5)4] [C(C6H5)3] .
Figure imgf000014_0001
ZrC14
Figure imgf000014_0002
[Bf Fs H CβHsW
Figure imgf000014_0003
To demonstrate the performance of the inventive catalysts with prior art catalysts, the insertion reaction of methyl metallocene complexes with a molecule of ethylene was computationally followed for three illustrative ZAM catalysts and two standard Ziegler-Natt catalysts The ZAM catalysts studied were of the formula :
Figure imgf000015_0001
wherein R = H and E = B in embodiment I (ZAM I) ; R = F and E = B for embodiment II (ZAM II) ; and R = H and E = Al in embodiment III (ZAM III) .
The two standard Group IV metallocenes were of the formula :
Figure imgf000015_0002
wherein E C in control I and E = Si for control II
Density Functional Theory (DFT) calculations were carried out using the PS-GVB-DFT program. Ringnalda, et al . , PS-GVB, 2.3 Schrόdinger, Inc. 1996; Slater, J. C. , Quantum Theory of Molecules and Solids, vol , 4 . The Self -Consistent Field for Mol ecules and Solids (McGraw-Hill, New York, 1974) ; and Perdew, J. P. Electronic Structure Theory of Solids, Ziesche, P. & Eschrig, H. eds. (Akademie Verlag, Berlin, 1991) . The Zr was described with the LACVP Hay adt effective core potential (ECP) to replace the core electrons [leaving the (4s)2(4p)6 [ (4d) (5s) (5p)]4 electrons to be described explicitly] and using the standard double zeta contraction. Hay, et al . , J. Phys . Chem. 82:270 (1985) . All other atoms, B, C, H, were described using the 6-31G** basis. Frisch, et al . , J. Chem. Phys . 80:3265 (1984). Collectively this ECP Basis is referred to as LACVP**. The NLDA implementation of DFT with GGAII functional (NLDA-GGAII) as well as the Becke 3 Yang, Lee, Parr functionals (NLDA-B3LYP) were used. All geometries for stable intermediates and for transition states were fully optimized with the above basis and method. Unless otherwise noted, the geometry was optimized without geometry constraints. Interesting, despite using different ab ini tio methods, the energies calculated for control II are virtually identical to those previously obtained by Morokuma's group (Yoshida, et al . , Organome tallies 14:746 (1995) ) .
The results of the insertion reaction are summarized in Figure 1 which displays the energies along the reaction coordinates for ZAM I and control II. As Figure 1 illustrates, the standard cationic metallocene binds ethylene exothermically by approximately 23 kcal/mol while the corresponding ZAM binds exothermically by about 16 kcal/mol. The insertion barrier for the cationic metallocene ranges from about 6-10 kcal/mol while ZAM has an insertion barrier of just less than 3 kcal/mol. The remaining energies of the ZAM catalyst were consistent with the energies of the cationic catalyst at the same level of theory. The energetics for the insertion reaction for ZAM I, ZAM III and control II are summarized in figure 2. The results for ZAM I and control II were calculated using DLDA-B3LYP and are consistent with the results using NLDA-GGAII.
It is to be understood that while the invention has been described above in conjunction with preferred specific embodiments, the description and examples are intended to illustrate and not limit the scope of the invention.

Claims

What is claimed is
A metallocene catalyst of the formula:
Figure imgf000018_0001
wherein
M is selected from a group consisting of Group III, Group IV, Group V, and Group VI elements;
E is boron or aluminum;
Rλ and R2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted Cx to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted C-|_ to C10 alkoxy;
.H , i\.4 , i[- , i\.g , K.Q , .Q , K.^ \ , and Kci are eacn independently selected from a group consisting of hydrogen, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted C to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R12)3, where R12 is selected from the group consisting of C-,^ to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl, wherein each pair of adjacent radicals together also may form a substituted or unsubstituted cyclic group having 4 to 15 carbons; and,
R7 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl, hydride, and Si(R13)3 where R13 is selected from a group consisting of Cx to C10 alkyl, C6 to C15 aryl, and C3 to C10 cyclolalkyl.
2. The catalyst as in claim 1 wherein M is a Group IV metal .
3. The catalyst as in claim 2 wherein M is zirconium.
4. The catalyst as in claim 1 wherein E is boron.
5. The catalyst as in claim 3 wherein R-_, R2 , R3 , R4, R5, R6, R8, R9, R10, and RX1 are each hydrogen.
6. The catalyst in claim 3 wherein E is boron;
Rλ and R2 are each independently selected from a group consisting of hydrogen, fluorine, CF3 , and C6F5;
3' ' 5' 6' 8' 9 ' 10' s d ηi are eacn independently selected from a group consisting of hydrogen, methyl, isopropyl, tert-butyl, and trimethylsilyl; and,
R7 is selected from a group consisting of methyl, tert-butyl, benzyl, phenyl, trimethylsilyl, and a hydride. A metallocene of the formula comprising:
Figure imgf000020_0001
wherein
E is boron or aluminum and R is selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted to C6 to
C15 aryl, and substituted and unsubstituted C1 to C10 alkoxy.
8. The metallocene as in claim 7 wherein the alkyl, aryl, or alkoxy is substituted with at least one electron withdrawing group.
9. The metallocene as in claim 7 wherein the alkyl, aryl, or alkoxy is substituted with at least one fluorine atom.
10. The metallocene as in claim 9 wherein the alkyl, aryl, or alkoxy is a perfluorinated alkyl, perfluorinated aryl, or a perfluorinated alkoxy.
11. The metallocene as in claim 7 wherein E is boron .
12. The metallocene as in claim 11 wherein R is hydrogen .
13. The metallocene as in claim 11 wherein R is fluorine.
14. The metallocene as in claim 11 wherein R is C6F5 or CF3.
15. A compound according to the formula:
Figure imgf000021_0001
wherein
E is boron or aluminum;
Rx and R2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted x to C10 alkoxy;
R3, R4 , R5, and R6 are each independently selected from a group consisting of hydrogen, substituted or unsubstituted Cx to C10 alkyl, substituted or unsubstituted Cx to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and
Si(R9)3 where R9 is selected from the group consisting of Cx to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl, wherein each pair of adjacent radicals together also may form a substituted or unsubstituted cyclic group having 4 to 15 carbons ;
R7 is selected from a group consisting of hydrogen, substituted or unsubstituted C to C10 alkyl, substituted or unsubstituted Cx to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R10)3 where R10 is selected from the group consisting of Cλ to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl; and,
R8 is selected from a group consisting of hydrogen, methyl, tert -butyl, benzyl, phenyl, hydride, and Si(R11)3 where Rχ is selected from a group consisting of Cx to C10 alkyl, C6 to C15 aryl, and C3 to C10 cyclolalkyl.
16. A method for olefin polymerization, comprising: contacting the olefin with a catalyst of the formula :
Figure imgf000022_0001
wherein M is selected from a group consisting of Group
III, Group IV, Group V, and Group VI elements; E is boron or aluminum; R1 and R2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted Cx to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted Cx to C10 alkoxy;
R3 , R4 , R5, R6, R8, R9, R10, and Rχ are each independently selected from a group consisting of hydrogen, substituted or unsubstituted C to C10 alkyl, substituted or unsubstituted Cx to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R12)3 where R12 is selected from the group consisting of C-_ to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl, wherein each pair of adjacent radicals together also may form a substituted or unsubstituted cyclic group having 4 to 15 carbons; and,
R7 is selected from a group consisting of hydrogen, methyl, tert -butyl, benzyl, phenyl, hydride, and Si(R13)3 where R13 is selected from a group consisting of Cx to C10 alkyl, C6 to C15 aryl, and C3 to C10 cyclolalkyl .
17. The method as in claim 16 wherein M is zirconium; E is boron; R and R2 are each independently selected from a group consisting of hydrogen, fluorine, CF3 , and C6F5;
R3, R4, R5, R6, R8, R9, R10, and Rxx are each independently selected from a group consisting of hydrogen, methyl, isopropyl, tert-butyl, and trimethylsilyl; and,
R7 is selected from a group consisting of methyl, tert-butyl, benzyl, phenyl, trimethylsilyl, and a hydride.
18. A method for olefin polymerization, comprising: contacting the olefin with a catalyst of the formula :
Figure imgf000024_0001
wherein E is boron or aluminum and
R is selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted C to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted Cx to C10 alkoxy.
19. The method as in claim 18 wherein E is boron.
20. The method as in claim 19 wherein the alkyl, aryl, or alkoxy is substituted with one or more fluorine atoms.
21. The method as in claim 19 wherein R is hydrogen, fluorine, CF3, or C6F5.
22. A method for olefin polymerization, comprising: contacting the olefin with a catalyst of the formula :
Figure imgf000025_0001
wherein
E is boron or aluminum;
R and R2 are each independently selected from a group consisting of hydrogen, fluorine, substituted or unsubstituted Cx to C10 alkyl, substituted or unsubstituted to C6 to C15 aryl, and substituted and unsubstituted Cχ to C10 alkoxy;
R3, R4, R5, and R6 are each independently selected from a group consisting of hydrogen, substituted or unsubstituted Cx to C10 alkyl, substituted or unsubstituted C to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R9)3 where R9 is selected from the group consisting of Cx to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl, wherein each pair of adjacent radicals together also may form a substituted or unsubstituted cyclic group having 4 to 15 carbons;
R7 is selected from a group consisting of hydrogen, substituted or unsubstituted C1 to C10 alkyl, substituted or unsubstituted Cx to C10 alkoxy, substituted or unsubstituted C6 to C15 aryl, substituted or unsubstituted C3 to C10 cycloalkyl, and Si(R10)3 where R10 is selected from the group consisting of Cx to C10 alkyl, C6 to C15 aryl, or C3 to C10 cycloalkyl; and,
R8 is selected from a group consisting of hydrogen, methyl, tert-butyl, benzyl, phenyl, hydride, and Si(R11)3 where R is selected from a group consisting of C-j^ to C10 alkyl, C6 to C15 aryl, and C3 to C10 cyclolalkyl .
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