Organometallic chemistry and catalysis

Organometallic chemistry and catalysis: Chiral Lewis acids; homogeneous metallocene Ziegler-Natta-catalysts; a-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; stable primary enamines; planar-tetracoordinate carbon compounds; cyclopropenylium betaines; bioorganometallic chemistry.

Drittmittelgeber:

Fonds der Chemischen Industrie; Alfried Krupp von Bohlen und Halbach-Stiftung; Alexander von Humboldt-Stiftung; Ministerium für Schule, Wissenschaft und Forschung des Landes Nordrhein-Westfalen; Katalyseverbund NRW; Deutsche Forschungsgemeinschaft; Bundesministerium für Bildung und Forschung; European Community; NATO; DAAD

Veröffentlichungen:

A. Bertuleit, M. Könemann, L. Duda, G. Erker, R. Fröhlich: Topics in Catalysis 1999, 7, 37-44. "Developing a fulvene route to C1-bridged "constrained geometry" Ziegler catalyst systems"

W. Ahlers, G. Erker, R. Fröhlich, U. Peuchert: J. Organomet. Chem. 1999, 578, 115-124. "Coupling of s -acetylide ligands at Group 4 metallocene complexes to yield methylenecyclopropene-type frameworks"

G. Erker, R. Hock, S. Wilker, C. Laurent, C. Puke, E.-U. Würthwein, N. C. Aust, R. Fröhlich: Phosphorus, Sulfur, and Silicon, 1999, 153-154, 79-97. "New Aspects of the Thio-Wittig-Reaction"

K. Klaß, L. Duda, N. Kleigrewe, G. Erker, R. Fröhlich, E. Wegelius: Eur. J. Inorg. Chem. 1999, 11-19. "Formation and Structures of [1,2- Bis(N-tert-butylcarbamoyl)cyclopentadienyl]zirconium Complexes - Coordination Chemistry of a "Fulvenologous" Malonic Amide Anion Ligand System"

G. Erker: Siegener Universitäts-Reden 1999, 21, 27-45. "Zirconium-Borat-Betaine: Synthese ungewöhnlicher Aromaten und die Entwicklung neuer Katalysatorsysteme"

M. Dahlmann, G. Erker, M. Nissinen, R. Fröhlich: J. Am. Chem. Soc. 1999, 121, 2820-2828. "Direct Experimental Observation of the Stereochemistry of the First Propene Insertion Step at an Active Homogeneous Single Component Metallocene Ziegler Catalyst"

U. Blaschke, G. Erker, M. Nissinen, E. Wegelius, R. Fröhlich: Organometallics 1999, 18, 1224-1234. "Metallaoxirane-Supported Hydrido Group 4 Metallocene Cations"

H. Jacobsen, H. Berke, S. Döring, G. Kehr, G. Erker, R. Fröhlich, O. Meyer: Organometallics 1999, 18, 1724-1735. "Lewis Acid Properties of Tris(pentafluorophenyl)borane. Structure and Bonding in L-B(C6F5)3 Complexe

U. Blaschke, F. Menges, G. Erker, R. Fröhlich: Eur. J. Inorg. Chem. 1999, 621-632."Syntheses and Insertion Reactions of (h²-Aldehyde)zirconocene-Supported (Hydrido)zirconocene Cation Systems"

C. Puke, G. Erker, B. Wibbeling, R. Fröhlich: Eur. J. Org. Chem. 1999, 1831-1841. "Structural and Spectroscopic Evidence for the Occurrence of gauche-Betaine Intermediates in the Thio-Wittig Reaction"

S. Knüppel, G. Erker, R. Fröhlich: Angew. Chem. Int. Ed. Engl. 1999, 38, 1923-1926. "Organische Chemie funktioneller Gruppen an Gruppe-4-Metallocengerüsten: Bildung eines starren Ansa-Metallocens durch C-C-Verknüpfung vom Typ der Mannich-Reaktion"

S. Knüppel, G. Erker, R. Fröhlich: Angew. Chem. 1999, 111, 2048-2051; "Organic Transformations at a Group 4 Metallocene Framework: Formation of a Rigid ansa-Metallocene by Mannich-type Carbon-Carbon Coupling"

G. Erker: Chem. Soc. Rev. 1999, 28, 307-314. "Using bent metallocenes for stabilizing unusual coordination geometries at carbon"

J. Wonnemann, M. Oberhoff, G. Erker, R. Fröhlich, K. Bergander: Eur. J. Inorg. Chem. 1999, 1111-1120. "Group-4 Metallocene Cation Complexes of Oligopeptides: Reaction of [Cp₂ZrCH₃(THF)⁺BPh4^-] with Boc-Protected Di- and Tripeptide Esters"

H.C. Strauch, R. Roesmann, S. Pacheiner, G. Erker, R. Fröhlich, B. Wibbeling: J. Organomet. Chem. 1999, 584, 318-322. "The reaction of (butadiene)tantalocene cation with bulky carbonyl derivatives"

H.C. Strauch, G. Erker, R. Fröhlich, M. Nissinen: Eur. J. Inorg. Chem. 1999, 1453-1459. "Formation of the [(s-trans-h ⁴-Butadiene)TaCp^*Cp]⁺ Cation and Its Reaction with Organic Carbonyl Derivatives"

J. Pflug, A. Bertuleit, G. Kehr, R. Fröhlich, G. Erker: Organometallics 1999, 18, 3818-3826. "Evidence for a-Nitrogen Participation in the Internal C-H Activation Reaction at ((Dimethylamino)methyl)cyclopentadienyl-Derived Methylzirconocene Cations"

H.C. Strauch, B. Wibbeling, R. Fröhlich, G. Erker, H. Jacobsen, H. Berke: Organometallics 1999, 18, 3802-3812. "Reactions of (Butadiene)tantalocene Cation with Alkyl Isocyanides"

S. Knüppel, R. Fröhlich, G. Erker: J. Organomet. Chem. 1999, 586, 218-222. "Formation of functionalized [3]ferrocenophane-derivatives by an enamine condensation reaction"

U. Blaschke, G. Erker, R. Fröhlich, O. Meyer: Eur. J. Inorg. Chem. 1999, 2243-2247. "Borane Insertion into Group-4 Metal-to-Carbon Bonds: The Reaction of HB(C₆F₅)2 with (h ²-Formaldehyde)zirconocene Dimer and with (Butadiene)zirconocene"

H.C. Strauch, K. Bergander, G. Kehr, R. Fröhlich, G. Erker: Eur. J. Inorg. Chem. 1999, 1461-1466. "Group 5 Metal Complexes with Cyclooctatetraene: Formation and Characterization of (Butadiene)(cyclooctatetraene)(cyclopentadienyl)tantalum Systems"

K. Klaß, R. Fröhlich, G. Erker: J. Chem. Soc., Dalton Trans. 1999, 4457-4461. "Formation and structural properties of 1,1',2,2'-tetra(tert-butylcarbamoyl)ferrocene and -ruthenocene Derivatives"

J. Pflug, R. Fröhlich, G. Erker: J. Chem. Soc., Dalton Trans. 1999, 2551-2555. "Unexpected alkyl-substituent exchange during the formation of a cationic bis(zirconocene) complex that contains a planar four-co-ordinate carbon atom"

D. Vagedes, R. Fröhlich, G. Erker: Angew. Chem. Int. Ed. Engl. 1999, 38, 3362-3365. "Reaktion von Naphtholen mit B(C₆F₅)₃: Bildung und Charakterisierung der Lewis-Säure-Addukte ihrer Keto-Isomere", D. Vagedes, R. Fröhlich, G. Erker, Angew. Chem. 1999, 111, 3561-3565. "Treatment of Naphthols with B(C₆F₅)₃: Formation and Characterization of the Lewis Acid Adducts of Their Keto-Isomers"

M. Dahlmann, G. Erker, R. Fröhlich, O. Meyer: Organometallics 1999, 18, 4459-4461. "Structural Characterization of an (s-trans-h⁴-Butadiene) Group 4 ansa-Metallocene Complex"

G. Kehr, R. Fröhlich, B. Wibbeling, G. Erker: Chem. Eur. J., 2000, 6, 258-266. "(N-Pyrrolyl)B(C₆F₅)2 - A New Organometallic Lewis Acid for the Generation of Group 4 Metallocene Cation Complexes"

H.C. Strauch, T. Rinderknecht, G. Erker, R. Fröhlich, E. Wegelius, F. Zippel, S. Höppener, H. Fuchs, L. Chi: Eur. J. Org. Chem. 2000, 187-192. "Substituent Dependent Formation of Supramolecular Aggregates of 6-Hydroxy-trans-3-hexenoic Acids in the Solid State"

H.C. Strauch, G. Erker, R. Fröhlich: J. Organomet. Chem., 2000, 593-594, 388-391. "Reaction of phenylacetylene with (butadiene)tantalocene cation"

T.H. Warren, G. Erker, R. Fröhlich, B. Wibbeling: Organometallics 2000, 19, 127-134. "1,3-Doubly Bridged Group 4 Metallocenes by Intramolecular Reductive Coupling of Pendant Olefins"

D. Kunz, G. Erker, R. Fröhlich, G. Kehr: Eur. J. Inorg. Chem. 2000, 409-416. "Reactions of Functional Groups at the Periphery of Group 4 Metallocene Frameworks: Selective Formation of a Cp-Bonded Azaboretidine Derivative by a Hydroboration Route"

B.E. Bosch, I. Brümmer, K. Kunz, G. Erker, R. Fröhlich, S. Kotila: Organometallics 2000, 19, 1255-1261. "Structural Characterization of Heterodimetallic Zr/Pd and Zr/Rh Catalyst Precursors Containing the C₅H₄PPh₂ Ligand"

S. Knüppel, J.-L. Fauré, G. Erker, G. Kehr, M. Nissinen, R. Fröhlich: Organometallics 2000, 19, 1262-1268. "Probing The Dynamic Features of Bis(aminocyclopentadienyl) and Bis(aminoindenyl) Zirconium Complexes"

J. Strauch, T. H. Warren, G. Erker, R. Fröhlich, P. Saarenketo: Inorg. Chim. Acta 2000, 300-302, 810-821. "Formation and structural properties of salicylaldiminato complexes of zirconium and titanium"

S. Venne-Dunker, W. Ahlers, G. Erker, R. Fröhlich: Eur. J. Inorg. Chem. 2000, 1671-1678. "Cyclopropenylium-Borate Betaines: Opening an Organometallic Route to Neutral Carbocation-Like Compounds"

J. Pflug, G. Erker, G. Kehr, R. Fröhlich: E ur. J. Inorg. Chem. 2000, 1795-1801. "Addition and Coupling Reactions of Zirconocene Cation Complexes that Contain a Pendant h ²-Formaldiminium Side Chain"

H. Jacobsen, T. Brackemeyer, H. Berke, G. Erker, R. Fröhlich: Eur. J. Inorg. Chem. 2000, 1423-1428. "Coordination Chemistry of {[Zr]-Cl-[Zr]}⁺ Complexes"

M. Niehues, G. Erker, O. Meyer, R. Fröhlich: Organometallics 2000, 19, 2813-2815. "Preparation of the Metallocene Oxide Cluster Compound [(Cp₂Zr)₃(m₂-OH)₃(m₃-O)⁺]BPh₄^- by Hydrolysis of Jordan's Cation [Cp₂ZrCH₃(THF)⁺]BPh₄^-"

M. Dahlmann, J. Schottek, R. Fröhlich, D. Kunz, M. Nissinen, G. Erker, G. Fink, R. Kleinschmidt: J. Chem. Soc., Dalton Trans. 2000, 1881-1886. "Structural characterization of M(s-cis-h⁴-C₄H₆)(Me₄C₅SiMe₂NR) (M = Ti or Zr, R = CMe₃ or CHCMe(1-C₁₀H₇)"

T. Dreier, G. Erker, R. Fröhlich, B. Wibbeling: Organometallics 2000, 19, 4095-4103. "2-Hetaryl-substituted Bis(indenyl)zirconium Complexes as Catalyst Precursors for Elastomeric Polypropylene Formation"

M. Dahlmann, R. Fröhlich, G. Erker: Eur. J. Inorg. Chem. 2000, 1789-1793. "Reaction of a Zirconocene(butadiene)borate-Betaine Single-Component Ziegler Catalyst with Trimethylphosphane"

M. Dahlmann, G. Erker, R. Fröhlich, O. Meyer: Organometallics, 2000, 19, 2956-2967. "Structural Dichotomy in Single-Component Ziegler Catalyst Systems: Characterization of ZrúúúF and ZrúúúC-Bonded Structural Types of Group 4 Metallocene [C₄H₆-B(C₆F₅)₃] Betaines"

M. Dahlmann, G. Erker, K. Bergander: J. Am. Chem. Soc. 2000, 122, 7986-7998. "Experimental Characterization of the Alkene-Addition/-Insertion Energy Profile at Homogeneous Group 4 Metal Ziegler-Type Catalysts"

J.-L. Fauré, G. Erker, R. Fröhlich, K. Bergander: Eur. J. Inorg. Chem., 2000, 2603-2606. "2-[Ethyl-(2-methallyl)amino]indenyllithium: Structural Characterization of a Base-Free Oligomeric Supersandwich Indenyllithium Compound"

K. Kunz, J. Pflug, A. Bertuleit, R. Fröhlich, E. Wegelius, G. Erker, E.-U. Würthwein: Organometallics, 2000, 19, 4208-4216. "Oligomeric Chain Structures of Substituted (Dialkylaminomethyl) cyclopentadienyllithium Compounds: Structural Variations Characterized by Different Involvement of the Internal Amino Donor Ligands in the Solid State"

Dissertations:

Blaschke, Ulrich: Synthese und Reaktivität Zirconaoxiran-stabilisierter Gruppe 4 Hydridometallocen-Kationen

Strauch, Hans Christian: (Butadien)tantalocen Kationen: Eine neue Substanzklasse in der Organometallchemie und Katalyse

Puke, Carsten: Untersuchungen zur Zwischenstufe der Thio-Wittig Reaktion

Knüppel, Stephanie: Metallkomplexe mit Amin- und Enamin-substituierten Cyclopentadienylliganden: Organische Chemie funktioneller Gruppen an Gruppe-4-Metallocenen

Dahlmann, Marc: Mechanistische Untersuchungen an homogenen (Butadien)metallocen/B(C₆F₅)₃-Ziegler-Katalysatoren

Pflug, Jörg: Darstellung von Alkylzirconocen-Kationen und deren Reaktionen mit polaren und unpolaren Reagenzien

Brackemeyer, Thomas: Tris(h⁵-Cyclopentadienyl)zirconium-Kation: Die Chemischen Eigenschaften einer ungewöhnlichen Lewis-Säure

Klaß, Katrin: Metall-Komplexe mit neuen 1,2-difunktionalisierten Cyclopentadienyl-Liganden

Kunz, Doris: Aminosäurefunktionalisierte Cyclopentadienyl-(Gruppe 4)- und (Gruppe 8)-Metallkomplexe: Darstellung und Reaktivität