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51

Reactions of Functional Groups at the Periphery of Group 4 Metallocene Frameworks: Selective Formation of a Cp-Bonded Azaboretidine Derivative by a Hydroboration Route

Doris Kunz, Gerhard Erker, Roland Fröhlich, Gerald Kehr

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 366 KB

english, 2000

52

First Hyperpolarizabilities of Manganese(I)−Chromium(0) Sesquifulvalene Complexes

Matthias Tamm, Thomas Bannenberg, Kim Baum, Roland Fröhlich, Thomas Steiner, Timo Meyer-Friedrichsen, Jürgen Heck

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 440 KB

english, 2000

53

Synthesis of Azapolycyclic Systems Based on the Indolizino[3,4-b]quinoline Skeleton − A Diastereoselective Entry to Potential Oligodentate Artificial Receptors

Oliver Temme, Tim Dickner, Sabine Laschat, Roland Fröhlich, Sirpa Kotila, Klaus Bergander

Journal:

European Journal of Organic Chemistry

Year:

1998

Language:

english

File:

PDF, 901 KB

english, 1998

54

A General Route to the Monomeric Subunits of the Macrotetrolides – A Short Synthesis of Methyl Nonactate

Uta Meiners, Eva Cramer, Roland Fröhlich, Birgit Wibbeling, Peter Metz

Journal:

European Journal of Organic Chemistry

Year:

1998

Language:

english

File:

PDF, 238 KB

english, 1998

55

Enantioselective Lithiation and Substitution of (E)-Cinnamyl N,N-Diisopropylcarbamate through Use of (−)-Sparteine Complexes

Karin Behrens, Roland Fröhlich, Oliver Meyer, Dieter Hoppe

Journal:

European Journal of Organic Chemistry

Year:

1998

Language:

english

File:

PDF, 268 KB

english, 1998

56

Diastereoselective Addition of Radicals to Chiral 1,3-Dioxin-4-ones

Heiner Graalfs, Roland Fröhlich, Christian Wolff, Jochen Mattay

Journal:

European Journal of Organic Chemistry

Year:

1999

Language:

english

File:

PDF, 535 KB

english, 1999

57

Synthesis and X-ray Analysis of New [5]Helicenes – HMO Calculations on the Photocyclization of the Stilbene Precursors

Christian Stammel, Roland Fröhlich, Christian Wolff, Hans Wenck, Armin de Meĳere, Jochen Mattay

Journal:

European Journal of Organic Chemistry

Year:

1999

Language:

english

File:

PDF, 373 KB

english, 1999

58

Structural and Spectroscopic Evidence for the Occurrence of gauche-Betaine Intermediates in the Thio Wittig Reaction

Carsten Puke, Gerhard Erker, Birgit Wibbeling, Roland Fröhlich

Journal:

European Journal of Organic Chemistry

Year:

1999

Language:

english

File:

PDF, 423 KB

english, 1999

59

Self-Assembly of 2,8,14,20-Tetraisobutyl-5,11,17,23-tetrahydroxyresorc[4]arene

Thorsten Gerkensmeier, Waldemar Iwanek, Ceno Agena, Roland Fröhlich, Sirpa Kotila, Christian Näther, Jochen Mattay

Journal:

European Journal of Organic Chemistry

Year:

1999

Language:

english

File:

PDF, 296 KB

english, 1999

60

Vinyl- and Divinylcyclopentadienes by Rhodium-Catalyzed Condensation of Alkynes with Cross-Conjugated Amino Metallahexatrienes [= (1-Amino-1,3-butadien-2-yl)carbene Complexes] (M = Cr, W)

Rudolf Aumann, Inigo Göttker-Schnetmann, Roland Fröhlich, Oliver Meyer

Journal:

European Journal of Organic Chemistry

Year:

1999

Language:

english

File:

PDF, 688 KB

english, 1999

61

Vinyl- and Divinylcyclopentadienes by Rhodium-Catalyzed Condensation of Alkynes with Cross-Conjugated Amino Metallahexatrienes [= (1-Amino-1,3-butadien-2-yl)carbene Complexes] (M = Cr, W)

Rudolf Aumann, Inigo Göttker-Schnetmann, Roland Fröhlich, Oliver Meyer

Journal:

European Journal of Organic Chemistry

Year:

1999

File:

PDF, 110 KB

1999

62

Substituent-Dependent Formation of Supramolecular Aggregates of 6-Hydroxy-trans-3-hexenoic Acids in the Solid State

Hans Christian Strauch, Thomas Rinderknecht, Gerhard Erker, Roland Fröhlich, Elina Wegelius, Frank Zippel, Stephanie Höppener, Harald Fuchs, Lifeng Chi

Journal:

European Journal of Organic Chemistry

Year:

2000

Language:

english

File:

PDF, 485 KB

english, 2000

63

Electrophilic Reactivity of a 2-Azaallenium and of a 2-Azaallylium Ion

Guido M. Böttger, Roland Fröhlich, Ernst-Ulrich Würthwein

Journal:

European Journal of Organic Chemistry

Year:

2000

Language:

english

File:

PDF, 272 KB

english, 2000

64

Chiral key positions in Uzara steroids

Guido F. Pauli, Roland Fröhlich

Journal:

Phytochemical Analysis

Year:

2000

Language:

english

File:

PDF, 5.59 MB

english, 2000

65

Platinum(II) Chloride Complexes of Linear Alkyl-bridged 2,2′-Bipyridine/Catechol Ligands

Markus Albrecht, Cyrill Riether, Roland Fröhlich

Journal:

Zeitschrift für anorganische und allgemeine Chemie

Year:

1999

Language:

english

File:

PDF, 157 KB

english, 1999

66

Perhydroxylierte 1,7-Dioxaspiro[5.5]undecane („Spirozucker”): Synthese, Stereochemie und Struktur

Raphael Bextermöller, Hartmut Redlich, Klaus Schnieders, Sven Thormählen, Roland Fröhlich

Journal:

Angewandte Chemie

Year:

1998

Language:

german

File:

PDF, 174 KB

german, 1998

67

Herstellung optisch aktiver α-Aminophosphinsäuren durch asymmetrische katalytische Hydrierung in organischen Lösungsmitteln und wäßrig-micellarem Medium

Torsten Dwars, Ute Schmidt, Christine Fischer, Ingrid Grassert, Rhett Kempe, Roland Fröhlich, Karlheinz Drauz, Günther Oehme

Journal:

Angewandte Chemie

Year:

1998

Language:

german

File:

PDF, 104 KB

german, 1998

68

Organische Chemie funktioneller Gruppen an Gruppe-4-Metallocengerüsten: Bildung eines starren Ansa-Metallocens durch C-C-Verknüpfung vom Typ der Mannich-Reaktion

Stephanie Knüppel, Gerhard Erker, Roland Fröhlich

Journal:

Angewandte Chemie

Year:

1999

Language:

german

File:

PDF, 111 KB

german, 1999

69

Reaktion von Naphtholen mit B(C6F5)3: Bildung und Charakterisierung der Lewis-Säure-Addukte ihrer Keto-Isomere

Dominik Vagedes, Roland Fröhlich, Gerhard Erker

Journal:

Angewandte Chemie

Year:

1999

Language:

german

File:

PDF, 156 KB

german, 1999

70

Nachweis des Gleichgewichts zwischen einem N-heterocyclischen Carben und seinem Dimer in Lösung

F. Ekkehardt Hahn, Lars Wittenbecher, Duc Le Van, Roland Fröhlich

Journal:

Angewandte Chemie

Year:

2000

Language:

german

File:

PDF, 123 KB

german, 2000

71

Ein molekularer Knoten mit zwölf Amidgruppen – Einstufensynthese, Kristallstruktur, Chiralität

Oliver Safarowsky, Martin Nieger, Roland Fröhlich, Fritz Vögtle

Journal:

Angewandte Chemie

Year:

2000

Language:

german

File:

PDF, 156 KB

german, 2000

72

Stereoselektive Bildung eines cyclischen dreikernigen cis-Dioxomolybdän(VI)-Komplexes aus einem chiralen Siderophor-Analogon

Anne-Kathrin Duhme-Klair, Guido Vollmer, Craig Mars, Roland Fröhlich

Journal:

Angewandte Chemie

Year:

2000

Language:

german

File:

PDF, 194 KB

german, 2000

73

Formation of Group 4 Metallocene-Enolate⋅B(C6F5)3 Adducts and Their Role as Initiators in the Rapid Polymerization of the Functionalized Olefin Methyl vinyl ketone

Wolf Spaether, Katrin Klaß, Gerhard Erker, Frank Zippel, Roland Fröhlich

Journal:

Chemistry - A European Journal

Year:

1998

Language:

english

File:

PDF, 180 KB

english, 1998

74

An Expansible Metalla-cryptand as a Component of a Supramolecular Combinatorial Library Formed from Di(8-hydroxyquinoline) Ligands and Gallium(III) or Zinc(II) Ions

Markus Albrecht, Oliver Blau, Roland Fröhlich

Journal:

Chemistry - A European Journal

Year:

1999

Language:

english

File:

PDF, 258 KB

english, 1999

75

Efficient Desymmetrization of meso-cis-1,2-Cyclohexanedimethanol with Differentiation between Diastereotopic and Enantiotopic C−H Bonds by (−)-Sparteine-Mediated Deprotonation

Jan van Bebber, Hartmut Ahrens, Roland Fröhlich, Dieter Hoppe

Journal:

Chemistry - A European Journal

Year:

1999

Language:

english

File:

PDF, 281 KB

english, 1999

76

(N-Pyrrolyl)B(C6F5)2-A New Organometallic Lewis Acid for the Generation of Group 4 Metallocene Cation Complexes

Gerald Kehr, Roland Fröhlich, Birgit Wibbeling, Gerhard Erker

Journal:

Chemistry - A European Journal

Year:

2000

Language:

english

File:

PDF, 217 KB

english, 2000

77

Perhydroxylated 1,7-Dioxaspiro[5.5]undecanes (“Spiro Sugars”): Synthesis, Stereochemistry, and Structure

Raphael Bextermöller, Hartmut Redlich, Klaus Schnieders, Sven Thormählen, Roland Fröhlich

Journal:

Angewandte Chemie International Edition

Year:

1998

Language:

english

File:

PDF, 184 KB

english, 1998

78

Synthesis of Optically Active α-Amino- phosphinic Acids by Catalytic Asymmetric Hydrogenation in Organic Solvents and Aqueous Micellar Media

Torsten Dwars, Ute Schmidt, Christine Fischer, Ingrid Grassert, Rhett Kempe, Roland Fröhlich, Karlheinz Drauz, Günther Oehme

Journal:

Angewandte Chemie International Edition

Year:

1998

Language:

english

File:

PDF, 106 KB

english, 1998

79

Treatment of Naphthols with B(C6F5)3: Formation and Characterization of the Lewis Acid Adducts of Their Keto Isomers

Dominik Vagedes, Roland Fröhlich, Gerhard Erker

Journal:

Angewandte Chemie International Edition

Year:

1999

Language:

english

File:

PDF, 145 KB

english, 1999

80

Evidence for an Equilibrium between an N-heterocyclic Carbene and Its Dimer in Solution

F. Ekkehardt Hahn, Lars Wittenbecher, Duc Le Van, Roland Fröhlich

Journal:

Angewandte Chemie International Edition

Year:

2000

Language:

english

File:

PDF, 124 KB

english, 2000

81

Stereoselectivity in the Formation of a Cyclic Trinuclear cis-Dioxomolybdenum(VI) Complex of a Chiral Siderophore Analogue

Anne-Kathrin Duhme-Klair, Guido Vollmer, Craig Mars, Roland Fröhlich

Journal:

Angewandte Chemie International Edition

Year:

2000

Language:

english

File:

PDF, 170 KB

english, 2000

82

Silicon Containing Structures at Interfaces: The Wetting Behavior of Carbohydrate Modified Si Surfactants on Perfluorinated Surfaces and the Modification of Rough Metal Surfaces by Hydrophilic Polysiloxane Networks

Roland Wagner, Yuling Wu, Lothar Richter, Thomas Pfohl, Stefan Siegel, Joachim Weißmüller, Jürgen Reiners, Martin Stelzle, Ronald Fröhlich

Journal:

Chemical Engineering & Technology

Year:

1998

Language:

english

File:

PDF, 189 KB

english, 1998

83

Reduced antilisterial activity of TNF-deficient bone marrow-derived macrophages is due to impaired superoxide production

Matthias Müller, Roland Althaus, Dieter Fröhlich, Karl Frei, Hans-Pietro Eugster

Journal:

European Journal of Immunology

Year:

1999

Language:

english

File:

PDF, 135 KB

english, 1999

84

Comparison of Characteristic Structural Features among the Triade of Tris(cyclopentadienyl)(Group-4 Metal) Complex Cations: a Combined Theoretical and Experimental Study

Heiko Jacobsen, Heinz Berke, Thomas Brackemeyer, Tanja Eisenblätter, Gerhard Erker, Roland Fröhlich, Oliver Meyer, Klaus Bergander

Journal:

Helvetica Chimica Acta

Year:

1998

Language:

english

File:

PDF, 257 KB

english, 1998

85

(−)-Sparteine-Mediated Asymmetric Intramolecular Carbolithiation of Alkenes: Synthesis of Enantiopure Cyclopentanes with Three Consecutive Stereogenic Centers

Dieter Hoppe, Michael J. Woltering, Martin Oestreich, Roland Fröhlich

Journal:

Helvetica Chimica Acta

Year:

1999

Language:

english

File:

PDF, 227 KB

english, 1999

86

Coordination Chemistry of {[Zr]−Cl−[Zr]}+ Complexes

Heiko Jacobsen, Thomas Brackemeyer, Heinz Berke, Gerhard Erker, Roland Fröhlich

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 373 KB

english, 2000

87

Cyclopropenylium−Borate Betaines: Opening an Organometallic Route to Neutral Carbocation-Like Compounds

Sabine Venne-Dunker, Wolfgang Ahlers, Gerhard Erker, Roland Fröhlich

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 621 KB

english, 2000

88

1:1- and 2:1-Copper(II) Complexes From Primary N-Acylamidines

Jan K. Eberhardt, Roland Fröhlich, Sabine Venne-Dunker, Ernst-Ulrich Würthwein

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 344 KB

english, 2000

89

Addition and Coupling Reactions of Zirconocene Cation Complexes that Contain a Pendant η2-Formaldiminium Side Chain

Jörg Pflug, Gerhard Erker, Gerald Kehr, Roland Fröhlich

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 376 KB

english, 2000

90

Reaction of a Zirconocene(butadiene)borate-Betaine Single-Component Ziegler Catalyst with Trimethylphosphane

Marc Dahlmann, Roland Fröhlich, Gerhard Erker

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 269 KB

english, 2000

91

2-[Ethyl-(2-methallyl)amino]indenyllithium: Structural Characterization of a Base-Free Oligomeric Supersandwich Indenyllithium Compound

Jean-Luc Fauré, Gerhard Erker, Roland Fröhlich, Klaus Bergander

Journal:

European Journal of Inorganic Chemistry

Year:

2000

Language:

english

File:

PDF, 261 KB

english, 2000

92

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

Gerald Kehr, Rolf Roesmann, Roland Fröhlich, Christiane Holst, Gerhard Erker

Journal:

European Journal of Inorganic Chemistry

Year:

2001

Language:

english

File:

PDF, 290 KB

english, 2001

93

Conformational Features of Group-4 ansa-Metallocenes with Long −(CH2)n− Chains Connecting Their Cyclopentadienyl Ligands

Tim Jödicke, Frederik Menges, Gerald Kehr, Gerhard Erker, Udo Höweler, Roland Fröhlich

Journal:

European Journal of Inorganic Chemistry

Year:

2001

Language:

english

File:

PDF, 540 KB

english, 2001

94

Coordination Chemistry of Unsymmetrical Tripodal Ligands with an NNO2 Donor Set

Christian Ochs, F. Ekkehardt Hahn, Roland Fröhlich

Journal:

European Journal of Inorganic Chemistry

Year:

2001

Language:

english

File:

PDF, 394 KB

english, 2001

95

Chelate Complexes of Functionalized Cycloheptatrienyl Ligands: 17- and 18-Electron Molybdenum Complexes with Linked Cycloheptatrienyl−Phosphane Ligands and Their Use in Transition Metal Catalysis

Matthias Tamm, Kim Baum, Thomas Lügger, Roland Fröhlich, Klaus Bergander

Journal:

European Journal of Inorganic Chemistry

Year:

2002

Language:

english

File:

PDF, 482 KB

english, 2002

96

Formation of Isomeric BAr3 Adducts of 2-Lithio-N-methylimidazole

Dominik Vagedes, Gerald Kehr, Dagmar König, Katrin Wedeking, Roland Fröhlich, Gerhard Erker, Christian Mück-Lichtenfeld, Stefan Grimme

Journal:

European Journal of Inorganic Chemistry

Year:

2002

Language:

english

File:

PDF, 174 KB

english, 2002

97

Synthesis, Structural and Chemical Characterization of Unsaturated C4- and C10-Bridged Group-4 ansa-Metallocenes Obtained Through a Ring-Closing Olefin Metathesis Reaction

Doris Hüerländer, Nina Kleigrewe, Gerald Kehr, Gerhard Erker, Roland Fröhlich

Journal:

European Journal of Inorganic Chemistry

Year:

2002

Language:

english

File:

PDF, 252 KB

english, 2002

98

The Reaction of (Butadiene)zirconocene with Imines

Carsten Höltke, Gerhard Erker, Gerald Kehr, Roland Fröhlich, Olga Kataeva

Journal:

European Journal of Inorganic Chemistry

Year:

2002

Language:

english

File:

PDF, 237 KB

english, 2002

99

Reaction of [(Cp2TiCH3)(THF)+][BPh4−] with Tripeptide Derivatives: Formation of Cationic (Peptide)titanocene Complexes

Dirk Harmsen, Gerhard Erker, Roland Fröhlich, Gerald Kehr

Journal:

European Journal of Inorganic Chemistry

Year:

2002

Language:

english

File:

PDF, 396 KB

english, 2002

100

1,3-Dioxycyclopentadienes from (1-Alkynyl)carbene Tungsten Complexes - Domino Cyclization/Cycloaddition Reactions

He-ping Wu, Rudolf Aumann, Roland Fröhlich, Birgit Wibbeling

Journal:

European Journal of Organic Chemistry

Year:

2000

Language:

english

File:

PDF, 474 KB

english, 2000

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