Fachbereich 12 - Chemie und Pharmazie
Organisch-Chemisches Institut
Professor Dr. Gerhard Erker

Organometallic chemistry and catalysis

Organometallic chemistry and catalysis: Chiral Lewis acids; homogeneous metallocene Ziegler-Natta-catalysts; olefin-polymerization; CO-conversion; metal-induced CC-coupling; organometallic and organic stereochemistry; dynamic metal containing compounds; enantioselective catalysis; chemical vapour deposition; chalcogenocarbonyl compounds; oxidation catalysts; template reactions; planar-tetracoordinate carbon compounds; bioorganometallic chemistry.

Drittmittelgeber:

Deutsche Forschungsgemeinschaft; Fonds der Chemischen Industrie; Alexander von Humboldt-Stiftung;

Veröffentlichungen:

"Protonation of the Heterocyclic Cp-Anion Equivalent [Pyrrolyl-B(C₆F₅)₃]Li - Formation of a Useful Neutral Brønsted Acid for the Generation of Homogeneous Metallocene Ziegler Catalysts", G. Kehr, R. Roesmann, R. Fröhlich, C. Holst, G. Erker, Eur. J. Inorg. Chem. 2001, 535-538.

"Homogeneous Single-Component Betaine Ziegler-Natta-Catalysts Derived from (Butadiene)zirconocene Precursors", G. Erker; Acc. Chem. Res. 2001, 34, 309-317.

"Preparation and structural features of 1-(2-pyridyl)- and 1-(2-furyl)indenyl-zirconium complexes", T. Dreier, R. Fröhlich, G. Erker, J. Organomet. Chem. 2001, 621, 197-206.

"Generation of Homogeneous (sp³-C1)-Bridged Cp/Amido and Cp/Phosphido Group 4 Metal Ziegler-Natta Catalyst Systems", K. Kunz, G. Erker, S. Döring, R. Fröhlich, G. Kehr, J. Am. Chem. Soc. 2001, 123, 6181-6182.

"Preparation of 1,2,3,4-Tetramethylpentafulvene by Hydride Anion Abstraction from Lithium Pentamethylcyclopentadienide Employing Tritylchloride", S. Döring, G. Erker, Synthesis 2001, 43-45.

"Synthesis and Structural and Chemical Features of Formimidoyl-Functionalized Lithium Cyclopentadienides", K. Kunz, G. Erker, G. Kehr, R. Fröhlich, Organometallics 2001, 20, 392-400.

"Group 4 metallocenes containing hetaryl substituents at their p-ligands: synthesis and characterization of the parent bis[2-(2-furyl)indenyl]zirconocene system", T. Dreier, G. Unger, G. Erker, B. Wibbeling, R. Fröhlich, J. Organomet. Chem. 2001, 622, 143-148.

"Preparation and Structural Features of Lithium Cyclopentadienides that Contain Amino Acid-Derived Cp-Substituents", D. Kunz, R. Fröhlich, G. Erker, Organometallics 2001, 20, 572-574.

"Synthesis and Structural Behavior of the Tris(h-cyclopentadienyl)zirconium-Betaine Complex Cp₂[h⁵-C₅H₄B(C₆F₅ )₃]Zr", N. Kleigrewe, T. Brackemeyer, G. Kehr, R. Fröhlich, G. Erker, Organometallics 2001, 20, 1952-1955.

"Structural Features of Primary 6-Aminopentafulvenes and Some of Their Derivatives", D. Kunz, R. Fröhlich, G. Erker, Eur. J. Org. Chem. 2001, 3531-3536.

"Molecular arrangement of lipid modified aminoacids at the solid-liquid interface of highly oriented pyrolytic graphite", S. Hoeppener, L. F. Chi, J. Wonnemann, G. Erker, H. Fuchs, Surface Science 2001, 487, 9-14.

"Conformational Features of Group-4 ansa-Metallocenes with Long (CH₂)n Chains Connecting their Cyclopentadienyl Ligands", T. Jödicke, F. Menges, G. Kehr, G. Erker, U. Höweler, R. Fröhlich, Eur. J. Inorg. Chem. 2001, 2097-2106.

"Formation and structural characterization of amino-substituted [3]ferrocenophanes derived from intramolecular Mannich-type coupling reactions at the metallocene framework", P. Liptau, S. Knüppel, G. Kehr, O. Kataeva, R. Fröhlich, G. Erker, J. Organomet. Chem. 2001, 637-639, 621-630.

"Structural and Dynamic Features of Bis[2-(2-furyl)indenyl]zirconium Derivatives", T. Dreier, K. Bergander, E. Wegelius, R. Fröhlich, G. Erker, Organometallics 2001, 20, 5067-5075.

"The Development of Single Component Metallocene Betaine Ziegler-Natta Catalysts and Related Systems", B. Temme, J. Karl, M. Dahlmann, K. Bergander, G. Kehr, H. Luftmann, R. Fröhlich, T. Jödicke, G. Erker, in Advances on Organometallic Catalysts and Olefin Polymerization in China and Germany, Ed. J. Sun, C. Janiak, Chemical Industry Press, Beijing, China, 2001, S. 82-93.

"Thermochemical Heat Treatment of Steel Substrates using Borane-Amine Adducts as Precursors", A. Küper, G. Kehr, J. Pflug, H.-R. Stock, C. Sarter, P. Mayr, G. Erker, Surface Engineering, 2001, 17, 55-60.

2002

"Formation of Cyclodimeric (sp²–C₁)-Bridged Cp/-Oxido ("CpC₁O"M^IVX₂) Group 4 Metal Ziegler-Natta Catalyst Systems – How Important is the "Constrained Geometry" Effect?", K. Kunz, G. Erker, G. Kehr, R. Fröhlich, H. Jacobsen, H. Berke, O. Blacque, J. Am. Chem. Soc., 2002, 124, 3316-3326.

"Synthesis of dimetallic m-alkylideneamido zirconocene dications by a thermodynamically favorable lithium chloride elimination pathway", S. Döring, G. Erker, R. Fröhlich, J. Organomet. Chem., 2002, 643/644, 61-67.

"Formation of sp³-C1-Bridged Cp/Amido Titanium and Zirconium "CpCN" Constrained-Geometry Ziegler-Natta Catalyst Systems", K. Kunz, G. Erker, S. Döring, S. Bredeau, G. Kehr, R. Fröhlich, Organometallics, 2002, 21, 1031-1041.

"Synthesis and structural characterization of Group 4 metallocene complexes that contain remote carboxamide functionalities at their Cp-side chain", D. Hüerländer, R. Fröhlich, G. Erker, J. Chem. Soc., Dalton Trans., 2002, 1513-1520.

"Synthesis and structural characterization of [H(OEt₂)₂]+[(C₃H₃N₂){B(C₆F ₅)₃}₂]^- – a Brønsted acid with an imidazole-derived "non-coordinating" anion", D. Vagedes, G. Erker, R. Fröhlich, J. Organomet. Chem. 2002, 641, 148-155, 2002, 651, 157.

"Conformational features of a furyl-substituted bis(tetrahydroindenyl)zirconium dichloride system", T. Dreier, F. Hannig, G. Erker, K. Bergander, R. Fröhlich, J. Phys. Org. Chem. 2002, 15, 582-589.

"Formation of Isomeric BAr₃ Adducts of 2-Lithio-N-methylimidazole", D. Vagedes, G. Kehr, D. König, K. Wedeking, R. Fröhlich, G. Erker, C. Mück-Lichtenfeld, S. Grimme, Eur. J. Inorg. Chem. 2002, 2015-2021.

"Synthesis and Structural Features of Arduengo Carbene Complexes of Group 4 Metallocene Cations", M. Niehues, G. Erker, G. Kehr, P. Schwab, R. Fröhlich, O. Blacque, H. Berke, Organometallics 2002, 21, 2905-2911.

"Structural Features of Me2Si-Bridged Cp/Phosphido Group 4 Metal Complexes, "CpSiP" Constrained-Geometry Ziegler-Natta Catalyst Precursors", G. Altenhoff, S. Bredeau, G. Erker, G. Kehr, O. Kataeva, R. Fröhlich, Organometallics 2002, 21, 4084-4089.

"Synthesis, Structural and Chemical Characterization of Unsaturated C₄- and C₁₀-Bridged Group-4 ansa-Metallocenes Obtained Through a Ring-Closing Olefin Metathesis Reaction", D. Hüerländer, N. Kleigrewe, G. Kehr, G. Erker, R. Fröhlich, Eur. J. Inorg. Chem. 2002, 2633-2642.

"Bildung eines zwitterionischen Einkomponentenkatalysators für die Ethenpolymerisation auf Basis von Butadiennickelkomplexen: ein alternativer Aktivierungsweg bei homogenen Ziegler-Natta-Katalysatoren später Übergangsmetalle", J. Strauch, G. Erker, G. Kehr, R. Fröhlich, Angew. Chem. 2002, 41, 2543-2546;

"Formation of a Butadienenickel-Based Zwitterionic Single-Component Catalyst for Ethylene Polymerization: An Alternative Activation Pathway for Homogeneous Ziegler-Natta Catalysts of Late Transition Metals", J. Strauch, G. Erker, G. Kehr, R. Fröhlich, Angew. Chem. Int. Ed. Engl. 2002, 114, 2662-2664.

"Reaction of [(Cp₂TiCH₃)(THF)⁺][BPh₄^-] with Tripeptide Derivatives: Formation of Cationic (Peptide)titanocene Complexes", D. Harmsen, G. Erker, R. Fröhlich, G. Kehr, Eur. J. Inorg. Chem. 2002, 3156-3171.

"The Reaction of (Butadiene)zirconocene with Imines", C. Höltke, G. Erker, G. Kehr, R. Fröhlich, O. Kataeva, Eur. J. Inorg. Chem. 2002, 2789-2799.

"Structural characterization of Group 4 transition metal halide bis-Arduengo carbene complexes MCl₄L₂: X-ray crystal structure analyses and DFT calculations", M. Niehues, G. Kehr, G. Erker, B. Wibbeling, R. Fröhlich, O. Blacque, H. Berke, J. Organomet. Chem. 2002, 663, 192-203.

"Synthesis of a Dinuclear m-(h²-Thioaldehyde)zirconocene Cation Complex", S. Courtenay, S. Smith, E. Hollink, U. Blaschke, G. Kehr, R. Fröhlich, G. Erker, D. W. Stephan, Z. Naturforsch. 2002, 1184-1188.

DISSERTATIONS:

Jödicke, Tim: "Entwicklung und Anwendung kombinierter Methoden in der Theoretischen Organischen Chemie"

Harmsen, Dirk: "Bioorganometallchemie: Systematische Untersuchungen zur Koordination von Titanocenen an Oligopeptide"

Wonnemann, Jörg: "Biometallorganische Chemie: Oligopeptide und ihre Wechselwirkung mit Metallocenen"

Kunz, Klaus: "Neue Katalysatoren für die Copolymerisation von a-Olefinen"

Döring, Steve: "Die Verwendung von Lithiumboraten in der Synthese von (Gruppe 4)-Metallocenkationen"

Hüerländer, Doris: "Gewinkelte Metallocene mit funktionellen Gruppen"

Vagedes, Dominik: "Reaktion der Lewis-Säure Tris(pentafluorphenyl)boran mit funktionalisierten Aromaten"

Dreier, Thorsten: "2-Hetarylsubstituierte Bis(indenyl)metallocene als Katalysatoren für die Herstellung von elastomerem Polypropylen"

Venne-Dunker, Sabine: "Bindungsaktivierung bei Bis(alkinyl)zirconocenen und Amino-funktionalisierten Zirconocenen"

Snell, Alexander: "Neuartige Gruppe 4 Metallkomplexe für die Polymerisation von polaren und unpolaren Monomeren"

Höltke, Carsten: "Neue Kupplungsreaktionen mit (Butadien)zirconocen-Komplexen“

Strauch, Joachim: "Synthese von Katalysatorsystemen mit frühen und späten Übergangsmetallen für diastereoselektive Polymerisation von polaren und unpolaren a-Olefinen"