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Type of compound having a metal center
related to the metallocenes are the metallocene derivatives, e.g. titanocene dichloride or vanadocene dichloride. Certain metallocenes and their derivatives
Metallocene
Catalyst for synthesis of polymers of 1-alkenes
methylaluminoxane (or methylalumoxane, MAO). These catalysts traditionally contain metallocenes but also feature multidentate oxygen- and nitrogen-based ligands. Ziegler–Natta
Ziegler–Natta_catalyst
Most common thermoplastic polymer
soluble catalysts, the metallocenes, were reported in 1976 by Walter Kaminsky and Hansjörg Sinn. The Ziegler- and metallocene-based catalysts families
Polyethylene
Catalyst for the industrial production of plastics
A post-metallocene catalyst is a kind of catalyst for the polymerization of olefins, i.e., the industrial production of some of the most common plastics
Post-metallocene_catalyst
Type of synthetic rubber formed from the polymerization of butadiene
companies like Ube are investigating other possible applications. The use of metallocene catalysts to polymerize butadiene is being explored by Japanese researchers
Polybutadiene
Organometallic compound
An ansa-metallocene is a type of organometallic compound containing two cyclopentadienyl ligands that are linked by a bridging group such that both cyclopentadienyl
Ansa-metallocene
Chemical compound
In organometallic chemistry, bent metallocenes are a subset of metallocenes. In bent metallocenes, the ring systems coordinated to the metal are not parallel
Bent_metallocene
Thermoplastic polymer
discovered much later than isotactic PP and could only be prepared by using metallocene catalysts. Syndiotactic PP has a lower melting point, with 161 to 186 °C
Polypropylene
In organometallic chemistry, f-block metallocenes are a class of sandwich compounds consisting of an f-block metal and a set of electron-rich ligands such
F-block_metallocene
Organometallic compound: Fe(II) sandwiched between two cyclopentadienyl rings
The discovery of ferrocene and its many structural analogues, known as metallocenes, sparked excitement and led to a rapid growth in the discipline of organometallic
Ferrocene
Chemical compound
research is what kind of ligands can be used to stabilize the Cp2ZrII metallocene fragment to make it available for further reactions in organic synthesis
Zirconocene
Chemical compound
the formula (η5-C5H5)2TiCl2, commonly abbreviated as Cp2TiCl2. This metallocene is a common reagent in organometallic and organic synthesis. It exists
Titanocene_dichloride
Chemical mechanism that makes C-C bonds
stereoregularity of the polymerisation of alkenes using Ziegler–Natta or metallocene catalysts. Stereoregularity is relevant for unsymmetrical alkenes such
Cossee–Arlman_mechanism
Chemical compound
to their high stability. The first metallocene characterised, ferrocene, was prepared the way many other metallocenes are prepared by combining alkali metal
Cyclopentadiene
Plastic polymer/filler blend
using regioselective and stereoselective catalysts known as metallocenes. The metallocene catalyst becomes embedded in the polymer and cannot be recovered
Thermoplastic_olefin
Ethylene polymerization catalyst
catalytic system for alkene polymerization. Kaminsky catalysts are based on metallocenes of group 4 transition metals (Ti, Zr, Hf) activated with methylaluminoxane
Kaminsky_catalyst
Chemical compound
as zirconocene dichloride. In the mid-1970s Kaminsky discovered that metallocene dichlorides can be activated by MAO (see Kaminsky catalyst). The effect
Methylaluminoxane
be produced by chromium/silica catalysts, Ziegler-Natta catalysts or metallocene catalysts. MDPE has good shock and drop resistance properties. It also
Medium-density_polyethylene
Chemical element with atomic number 72 (Hf)
simplest hafnium metallocene is hafnocene dichloride. Hafnium metallocenes are part of a large collection of Group 4 transition metal metallocene catalysts that
Hafnium
Chemical element with atomic number 6 (C)
and η3-allyl compounds (for example, allylpalladium chloride dimer); metallocenes containing cyclopentadienyl ligands (for example, ferrocene); and transition
Carbon
Coordination complex of a metal and cyclopentadienyl groups
1950s. Bent metallocenes are represented by compounds of the type [MCp2Lx]. Some are catalysts for ethylene polymerization. Metallocenes are often thermally
Cyclopentadienyl_complex
German chemist (1941–2024)
polymerization and plastic recycling. He discovered the high activity of Group 4 metallocene/methylaluminoxane (MAO) mixtures (later named the Kaminsky catalyst)
Walter_Kaminsky
Chemical compound
temperature. Cobaltocene was discovered shortly after ferrocene, the first metallocene. Due to the ease with which it reacts with oxygen, the compound must
Cobaltocene
American chemist and professor
(2001–2011) Thesis Ancillary Ligand Effects on Fundamental Transformations in Metallocene Catalyzed Olefin Polymerization (2000) Doctoral advisor John E. Bercaw
Paul_Chirik
Organometallic chemical compound
analogue of rhodocene and the first of the class of compounds now known as metallocenes. Ferrocene was found to be unusually chemically stable, as were analogous
Rhodocene
polypropylene. The catalyst was one of the first major departures from metallocene-based catalysts and ushered in much innovation in the development of
Constrained_geometry_complex
complexes are comparable to those in cyclopentadienyl complexes. For the metallocenes M(Ind)2, ring slipping is evident for the case of M = Co and especially
Transition metal indenyl complex
Transition_metal_indenyl_complex
The dehydrogenative coupling of silanes is a reaction type for the formation of Si-Si bonds. Although never commercialized[citation needed], the reaction
Dehydrogenative coupling of silanes
Dehydrogenative_coupling_of_silanes
Chemical compound
compound with the salts of main-group and transition metals. The resulting metallocenes, in contrast to the unsubstituted Pentaphenylcyclopentadienyl complexes
1,2,3,4,5-Pentakis(4-butylphenyl)-1,3-cyclopentadiene
1,2,3,4,5-Pentakis(4-butylphenyl)-1,3-cyclopentadiene
Chemical compound
organochromium compound with the formula [Cr(C5H5)2]. Like structurally related metallocenes, chromocene readily sublimes in a vacuum and is soluble in non-polar
Chromocene
Chemical compound
Jeffrey Schwartz, a chemistry professor at Princeton University. This metallocene is used in organic synthesis for various transformations of alkenes and
Schwartz's_reagent
dimethylbis(cyclopentadienyl)hafnium(IV). Cationic hafnocene complexes, post-metallocene catalysts, are used on an industrial scale for the polymerization of
Organozirconium and organohafnium chemistry
Organozirconium_and_organohafnium_chemistry
Chemical reaction to form polymer chains
micromirror device. Cross-link Enzymatic polymerization In situ polymerization Metallocene Plasma polymerization Polymer characterization Polymer physics Reversible
Polymerization
are based on metallocenes of group 4 metals (Ti, Zr, Hf) activated with methylaluminoxane (MAO). Polymerizations catalysed by metallocenes occur via the
Coordination_polymerization
Polymer resin widely used in packaging
produced under the trade name XAREC by Idemitsu corporation, who use a metallocene catalyst for the polymerisation reaction. Polystyrene is relatively chemically
Polystyrene
reagent is a metallocene bis(trimethylsilyl)acetylene complex with zirconium (Cp2Zr) or titanium (Cp2Ti) used as central atom of the metallocene fragment
Rosenthal's_reagent
Ethylene polymerization catalyst
catalysts (based on titanium trichloride), and, for specialty polymers, metallocene-based catalysts. The Phillips catalyst is prepared by impregnating high
Phillips_catalyst
(lemon yellow, CfI3). Other +3 oxidation states include the sulfide and metallocene. Californium(IV) oxide (black brown, CfO2), californium(IV) fluoride
Californium_compounds
Chain-growth polymerization without the ability to terminate
transfer to the co-initiator) and as a result are not considered living. Metallocene initiators are considered as a type of Ziegler-Natta initiators due to
Living_polymerization
Chemical compound
point 82 °C; 180 °F; 355 K Related compounds Related compounds Metallocene f-Block metallocene Actinocene Uranocene Zirconocene Vanadocene Chromocene Ferrocene
Bis(benzene)chromium
Chemical element with atomic number 40 (Zr)
Schwartz's reagent, prepared in 1970 by P. C. Wailes and H. Weigold, is a metallocene used in organic synthesis for transformations of alkenes and alkynes
Zirconium
Chemical compound
Osmocene is an organoosmium compound found as a white solid. It is a metallocene with the formula Os(C5H5)2. Osmocene is commercially available. It may
Osmocene
Class of metallocene cations
Group 8 Metallocenylmethylium Cations are a class of metallocene cations that feature a bond between the iron, ruthenium or osmium center and a carbenium
Group 8 metallocenylmethylium cation
Group_8_metallocenylmethylium_cation
Chemical compound
chemists led by Linda Broadbelt and Tobin J. Marks developed rare earth metallocene catalysts that rapidly break Nylon 6 down back to caprolactam at 220 °C
Nylon_6
Chemical element with atomic number 98 (Cf)
their 5f electrons. Other +3 oxidation states include the sulfide and metallocene. Europium, in the sixth period directly above element 95, was named for
Californium
Metal-organic compound
Mansikkamäki, Akseli; Layfield, Richard A. (2017-09-11). "A Dysprosium Metallocene Single-Molecule Magnet Functioning at the Axial Limit". Angewandte Chemie
Single-molecule_magnet
Organometallic compound
group sandwich compound, structurally related to the d-block element metallocenes, and consists of a central magnesium atom sandwiched between two cyclopentadienyl
Magnesocene
Chemical element with atomic number 108 (Hs)
+2—although the bonding between the metal and the rings is mostly covalent in metallocenes—rather than the high +8 state that had previously been investigated,
Hassium
Chemical compound
Ni(C5H5)2 belongs to a group of organometallic compounds called metallocenes. Metallocenes usually adopt structures in which a metal ion is sandwiched between
Nickelocene
Polymerization process involving free radicals as repeating units
of initiating system contains a metallocene, an initiator, and a heteroaromatic diketo carboxylic acid. Metallocenes in combination with initiators accelerate
Radical_polymerization
Chemical element with atomic number 65 (Tb)
Long, J. R. (2019-08-21). "Synthesis and Magnetism of Neutral, Linear Metallocene Complexes of Terbium(II) and Dysprosium(II)". Journal of the American
Terbium
Brazilian Petrochemical Corporation
conversion of one of its polyethylene production lines in Bahia to produce metallocene-based LLDPE. This resin, of more modern technology, will supply the plastic
Braskem
A lanthanocene is a type of metallocene compound that contains an element from the lanthanide series. The most common lanthanocene complexes contain two
Lanthanocene
Family of related polymers
"A WAXD/SAXS/DSC study on the melting behavior of Ziegler-Natta and metallocene catalyzed isotactic polypropylene". Journal of Polymer Science Part B:
Polyolefin
Chemical compound
is an organotanalum compound in the family of bent metallocenes consisting of two cyclopentadienyl rings and three hydrides coordinated
Tantalocene_trihydride
Very long-chain polyethylene with high impact strength
Catalysis is effected by coordination polymerization, which involves metallocene (Kaminsky catalysts) or Ziegler-Natta catalysts. The resulting UHMWPE
Ultra-high-molecular-weight polyethylene
Ultra-high-molecular-weight_polyethylene
Reaction of a lead(II) source with sodium cyclopentadienide gives the lead metallocene, plumbocene. Plumbocene is essentially the only stable organolead(II)
Organolead_chemistry
Group of highly reactive chemical elements
organic derivatives are characterised. Cobaltocene, Co(C5H5)2, is a metallocene, the cobalt analogue of ferrocene. It is a dark purple solid. Cobaltocene
Alkali_metal
Chemical compound
caesium, it has a higher ionization energy and is radioactive) or known metallocene reducing agents such as decamethylcobaltocene with 4.71 eV. This coordination
Ditungsten_tetra(hpp)
American chemist
organometallic chemistry. A recent major thrust has been the development of post-metallocene catalysts based upon late transition metal (Ni and Pd) complexes for
Maurice_Brookhart
Chemical compound
organic solvents. Uranocene, a member of the "actinocenes," a group of metallocenes incorporating elements from the actinide series. It is the most studied
Uranocene
Chemical compound
D. (1988). "Syndiospecific propylene polymerizations with group IVB metallocenes". Journal of the American Chemical Society. 110 (18): 6255–6256. Bibcode:1988JAChS
Fluorene
Chemical compound
[C6H4C9H7]2. The compound is the precursor, upon deprotonation, to ansa-metallocene complexes within the area of transition metal indenyl complexes. Metals
2,2'-Bis(2-indenyl)_biphenyl
Chemical compound made of two ring ligands bound to a metal
said to be "sandwiched". A special class of sandwich complexes are the metallocenes. The term sandwich compound was introduced in organometallic nomenclature
Sandwich_compound
American chemist
organometallic chemistry, organic photochemistry, organic chemistry, metallocenes and the synthesis of heterocyclic compounds containing sulfur, selenium
Dwaine_O._Cowan
Study of organic compounds containing metal(s)
the Nobel Prizes to Ernst Fischer and Geoffrey Wilkinson for work on metallocenes. In 2005, Yves Chauvin, Robert H. Grubbs and Richard R. Schrock shared
Organometallic_chemistry
Chemical compound
are known. According to X-ray crystallography, the structures of the metallocene component of FcBF4 and the parent ferrocene are very similar. The Fe-C
Ferrocenium_tetrafluoroborate
Allotropes of carbon with a cylindrical nanostructure
introduced into a carbon nanotube, such as alkali metals and electron-rich metallocenes, result in n-type conduction because they donate electrons to the π-electron
Carbon_nanotube
Subfield of main group chemistry
Heinz-Jürgen; Lentz, Dieter (2004-11-19). "Butenyl-Substituted Alkaline-Earth Metallocenes: A First Step towards Olefin Complexes of the Alkaline-Earth Metals"
Organocalcium_chemistry
Group of chemical compounds containing mercury
the mercury σ-bonded to just one carbon of each ring, rather than a metallocene with the metal bonded to the rings' π systems. The toxicity of organomercury
Organomercury_chemistry
Chemical element with atomic number 97 (Bk)
1000 °C in inert atmosphere. Berkelium forms a trigonal (η5–C5H5)3Bk metallocene complex with three cyclopentadienyl rings, which can be synthesized by
Berkelium
Addition of an N–H group across a C=C or C≡C bond
Chiral auxiliaries on the metallocene ligands were used to dictate the stereochemistry of the product. The first non-metallocene chiral catalysts were reported
Hydroamination
Chemical compound
commonly abbreviated as Cp2TiS5, where Cp stands for cyclopentadienyl. This metallocene exists as a bright red solid that is soluble in organic solvents. It
Titanocene_pentasulfide
Electrode with a stable and accurate electrode potential
Chem. Rev. 1996, 96, 877. Aranzaes, J. R., Daniel, M.-C., Astruc, D. "Metallocenes as references for the determination of redox potentials by cyclic voltammetry
Reference_electrode
American inorganic chemist
that time, Kiplinger also reported improved synthesis of uranium-based metallocene complexes (C5Me5)U(CH2C6H5)3. Kiplinger continued her research at LANL
Jaqueline_Kiplinger
Polymerization mechanism
polymer effectively. In addition, the racemic mixture of the chiral metallocene can be separated into its enantiomers. The oligomerization reaction produces
Chain-growth_polymerization
Molecular-scale artificial or biological device
instance, single bonds can be visualized as axes of rotation, as can be metallocene complexes. Bending or V-like shapes can be achieved by incorporating
Molecular_machine
In terms of homogeneous catalysts, this field has been dominated by metallocene-based catalysts inspired by the Kaminsky catalyst in 1976. Initially
Transition metal phosphinimide complexes
Transition_metal_phosphinimide_complexes
Chemistry of compounds with W-C bonds
formally reduced tungsten center. Tungstenocenes, or tungsten-containing metallocenes, may be formed from these cyclopentadienyl complexes. The formal 12-electron
Organotungsten_chemistry
Chemical compound
Tris(cyclopentadienyl)cerium is a metal organic compound of cerium with the chemical formula Ce(C5H5)3. It and the other cyclopentadiene compounds of the
Tris(cyclopentadienyl)cerium
Functional Theory Predictions of Second-Order Hyperpolarizabilities of Metallocenes". The Journal of Physical Chemistry A. 101 (49): 9391–9398. Bibcode:1997JPCA
Discovery_Studio
Chemical compound
Pentamethylcyclopentadienyl iridium dichloride dimer is an organometallic compound with the formula [(C5(CH3)5IrCl2)]2, commonly abbreviated [Cp*IrCl2]2
Pentamethylcyclopentadienyl iridium dichloride dimer
Pentamethylcyclopentadienyl_iridium_dichloride_dimer
reaction proceeds at room temperature, with high conversion. Group 4 metallocenes also catalyze dehydrogenation of ABs. Activity is affected by metal (Ti
Amine-boranes
Form of thermoplastic adhesive
surface energy and provide good wetting of most metals and polymers. Metallocene-catalyst-synthesised polyolefins have a narrow distribution of molecular
Hot-melt_adhesive
Branch of organometallic chemistry
NiCp2 with +2 Ni oxidation state and 20 valence electrons is the main metallocene of nickel. It can be oxidized by one electron. The corresponding palladocene
Organonickel_chemistry
Chemical compound
solid is classified as a sandwich compound and more specifically, as a metallocene. Ruthenocene consists of a ruthenium ion sandwiched in between two cyclopentadienyl
Ruthenocene
be catalyzed by Ti, Zr, Pd-based catalyst, and some Lanthanide-based metallocene catalyst, where different polymerization patterns vary when catalysts
Β-Carbon_elimination
2005 edition of the Nomenclature of Inorganic Chemistry
rhenocene, [Re(η5-C5H5)2]. Examples of compounds that should not be named as metallocenes are: C10H10Ti [Ti(η5-C5H5)2Cl2] is properly named
IUPAC nomenclature of inorganic chemistry 2005
IUPAC_nomenclature_of_inorganic_chemistry_2005
Chemical Compound
main-group cyclopentadienyl complex; these molecules are related to metallocenes but contain p-block elements as the central atom. It is a colorless,
Decamethylsilicocene
Phenomenon in chemistry
Anwar (December 2010). "Effect of selected residual Ziegler–Natta and metallocene catalysts on the UV-induced degradation of unstabilized ethylene homopolymer
Photo-oxidation_of_polymers
Chemical reaction with carbon-metal bond
Regioselective Carboalumination Reactions Catalyzed by Zirconocene Derivatives", Metallocenes in Regio- and Stereoselective Synthesis: -/-, Topics in Organometallic
Carbometalation
scientists over the years. One major effort was on DuPont Versipol post-metallocene catalysts for ethylene coordination polymerization and copolymerization
Steven_Ittel
Chemical compound
Cerocene is a organometallic complex with the chemical formula Ce(C8H8)2 (Ce(cot)2). It is a sandwich compound consisting of a central cerium atom and
Cerocene
Chemical compound
79 (13): 3416–3420. doi:10.1021/ja01570a027. Rausch, M. D. (1963). "Metallocene Chemistry—A Decade of Progress". Canadian Journal of Chemistry. 41 (5):
Ferrocenecarboxaldehyde
Chemical compound
first described by Birmingham and Wilkinson. The compound is a bent metallocene: the Cp rings are not parallel, the average Cp(centroid)-M-Cp angle being
Zirconocene_dichloride
Polymers with polar and nonpolar functionalities
a cocatalyst, MAO is well known for their use in metallocene chemistry as they activate metallocene complexes for olefin polymerization. To remove the
Functionalized_polyolefins
Polymer
(titanium- and zirconium-based). LLDPE that is manufactured by using metallocenes is sometimes labeled as mLLDPE. Such catalysts can produce polymers with
Linear low-density polyethylene
Linear_low-density_polyethylene
; Evans, W. J. (2010). "Reactivity of Tuck-in and Tuck-over Uranium Metallocene Complexes". Organometallics. 29: 4159–4170. doi:10.1021/om1007538. Sun
Tuck-in_complex
American chemistry award
oxide chemical vapor deposition, high temperature superconductors, and metallocene anti-tumor agents." Ralph Hirschmann 2002 "For the first synthesis of
Willard_Gibbs_Award
Chemical compound
B. M.; Lappert, M. F.; Spalding, T. R.; Srivastava, R. C. (1969). "Metallocene Halides. Part I. Synthesis, Spectra, and Redistribution Equilibria of
Hafnocene_dichloride
METALLOCENE
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METALLOCENE
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Lord Indra
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Flute
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Spirit.
METALLOCENE
METALLOCENE
METALLOCENE
METALLOCENE
METALLOCENE