141 K. Schwitalla, M.-C. Müller, D. Fabra, M. Schmidtmann, U. Meyer, A. Matesanz, A. G. Quiroga, B. Rauch, R. Beckhaus, Rüdiger
Water-soluble, Titanocene-based Prodrugs with Thiosemicarbazones as Cytotoxic Agents
ACS Omega, 2025, 10, 36, 41677-41687

140 M. Eilers, T. Bötel, K. Schwitalla, M. Schmidtmann, R.Beckhaus
Fluctuating Behaviour and Ligand-Dependent Reactivity of Isocyanates with Bis(pentafulvene)titanium Complexes
Inorganic Chemistry, 2025, 64, 12990-12999

139 M. Eilers, M. Beuße, K. Schwitalla, M. Schmidtmann, R. Beckhaus
Synthesis of Titanium k1S-Thioamidato Complexes from Reactions of Bis(pentafulvene)complexes with Isothiocyanates
Z.Anorg. Allg. Chem., 2025, e202500090
https://doi.org/10.1002/zaac.202500090

Dedicated to Prof. Dr Mathias Wickleder on the occasion of his 60th Birthday

138 M. Eilers, K. Schwitalla, M. Schmidtmann, R. Beckhaus
Titanium Carboxylate Complexes through Co₂ Capture
Organometallics 2025, 44, 866-874

137 K. Schwitalla, L. Gronewold, M. Schmidtmann, R. Beckhaus
Tuning Lewis Acidity: Design of Titanium Complexes with hemilabile Pyridine-based Ligands
European Journal of Inorganic Chemistry, 2025, e202500021
https://doi.org/10.1002/ejic.202500021

136 M. Eilers, S. Bültena, K. Schwitalla, M. Schmidtmann, R. Beckhaus
Synthesis, Characterization and Functionalization of Titanium k1N Amidinato Complexes from Carbodiimides
Dalton Transactions, 2025, 54, 1972-1979

135 K. Schwitalla, M. Claußen, M. Schmidtmann, R. Beckhaus
Syntheses and Coordination Chemistry of Thiosemicarbazone based Titanium Complexes
New J. Chem., 2024, 48, 18066-18074.

134 K. Schwitalla, Z. Yusufzadeh, M.Schmidtmann, R. Beckhaus
From Coordination to Non-Coordination: Syntheses and Substitution Lability Studies of Titanium Triflato Complexes
Inorganic Chemistry, 2024, 63, 14392-14401.

133 K. Schwitalla, J. Klimek, T. Greven, M. Schmidtmann, R. Beckhaus
Syntheses, Characterisation and Redox Activity of Ferrocene-Containing Titanium complexes
ACS Omega 2024, 9, 26, 29017-2924.

132 K. Schwitalla, F. Sad, M. Schmidtmann, R. Beckhaus
Syntheses, Characterisation and Multifaceted Coordination of Chemistry Hydrazonido Titanium Complexes
Inorganic Chemistry 2024, 63, 6, 3165-3172.

121 S. de Graaff, M. Eilers, J. Buschermöhle, N. Bengen, M. Manßen, A. Dierks, M. Schmidtmann, R. Beckhaus
Niobium Bis- and Mono(Pentafulvene) Complexes: E-H Bond Cleavage and Insertion Reactions (E = C, N, O)
European Journal of Inorganic Chemistry 2022, e202200637,(https://doi.org/10.1002/ejic.202200637)

120 K. Fitschen, N. Frerichs, Z. Yusufzadeh, R. Kurt, M. Schmidtmann, R. Beckhaus
Crystal structures of the Lewis Acid-Base Adducts: {[(C₆H₁₁)₂N]^₃Ti-LB}+[MeB(C₆F₅)₃]^- x 1.5 C₇H₈ LB: (C₆H₅)₃PO (1), p-F-C₆H₄CN (2)
Acta Crystallographica Section E-Crystallographic Communications 2022, E78, 912-915.

119. S. de Graaff, K. Schwitalla, C. V. Haaker, N. Bengen, M. Schmidtmann, R. Beckhaus
A Niobium Pentafulvene Ethylene Complex: Synthesis, Properties and Reaction Pathways
Dalton Transactions, 2022,51, 12502-12511.

118 M. Fischer, M. M. D. Roy, S. Hüller, M. Schmidtmann, R. Beckhaus
Reaction of a bis(pentafulvene)titanium complex with an N heterocyclic olefin: C-H-Activation leads to resonance between a Titanium Vinyl and Titanium Alkylidene Complex
Dalton Transactions, 2022, 51, 10690-10969.
Themed issue: New Talent: Europe

117. S. de Graaff, A. Chandi, M. Schmidtmann, R. Beckhaus
Cooperative Reactions of Pentafulvene Niobium Complexes - Formation of Alkylidene, Imido, Hydrazido and Niobaaziridine Complexes Organometallics, 2021, 40, 19, 3298-3305.

116 M. Fischer, M. Manßen, M. Schmidtmann, T. Klüner, R. Beckhaus
Selective Propargylic C(sp³)-H Activation of Methyl-Substituted Alkyne
Chemical Science 2021, 12, 13711-13718.

115 T. Kaper, M. Fischer, H. Thye, D. Geik, M. Schmidtmann, R. Beckhaus, S. Doye
Intermolecular Hydroaminoalkylation of Alkynes
Chem. Eur. J. 2021, 27, 6899-6903.

114. S. Ossinger, C. Näther, A. Buchholz, M. Schmidtmann, S. Mangelsen, R. Beckhaus, W. Plass, F. Tuczek
Spin Transition of an Iron(II) Organoborate Complex in Different Polymorphs and in Vacuum-Deposited Thin Films: Influence of Cooperativity
Inorganic Chemistry, 59 (2020) 7966-7979.

113 N. Frerichs, M. Schmidtmann, R. Beckhaus
Tetrakis(dicyclohexylamido)zirconium(IV)
IUCrData 2020. 5, x201145

112 T. Kaper, M. Fischer, M. Warsitz, R. Zimmering, R. Beckhaus, S. Doye,
Intermolecular Hydroaminoalkylation of Propadiene
Chem. Eur. J. 2020, 26, 14300-14304.

111 N. Frerichs, L. Lukas, M. Schmidtmann, R. Beckhaus
Tris(dicyclohexylamido) Group 4 Metal Allyl and Phenylacetylide Complexes - Synthesis and Characterisation
Eur. J. Inorg. Chem. 2020, 45, 4247-4253.

110 A. Markovic, L. Gerhards, P. Sander, C. Dosche, T. Klüner, R. Beckhaus, G. Wittstock
Electronic transitions in different redox states of trinuclear 5,6,11,12,17,18-hexaazatrinaphthylene-bridged titanium complexes: Spectroelectrochemistry and quantum chemistry
ChemPhysChem 2020, 21, 2506-2514.

109 M. Fischer, M. Wolff, E. del Horno, M. Schmidtmann, R. Beckhaus
Synthesis, Reactivity and Lewis Acidity of Mononuclear Titanocene Imido Complexes Bearing Sterical Demanding Terphenyl Moieties
Organometallics 2020, 39, 3232-3239.

108 M. Fischer, L. Vincent-Heldt, M. Hillje, M. Schmidtmann, R. Beckhaus
Synthesis of a Titanium Ethylene Complex via C-H-Activation and Alternative Access to Cp₂Ti(η²-Me₃SiC₂SiMe₃)
Dalton Transactions, 2020, 49, 2068-2072.

107 M. Rosien, I. Töben, M. Schmidtmann, R. Beckhaus, S. Doye,
Titanium-Catalyzed Hydroaminoalkylation of Ethylene
Chemistry - A European Journal 2020, 26, 2138-2142.

106 Malte Fischer, Kerstin Fitschen, Marc Schmidtmann and Rüdiger Beckhaus
Reactivity Studies on a Bis(p-h5:s-h1-benzofulvene)titanium Complex Incorporating Simultaneous N-H and C(sp2)-H Activation of Dibenzylamine
Organometallics 2019, 38, 3760 - 3767.

105 M. Fischer, D. Barbul, M. Schmidtmann and R. Beckhaus
Unexpected selective methyl group abstraction from the SiMe₃ moieties of CH₂SiMe₃ ligands to give novel cationic titanium complexes
Chemistry - A European Journal 2019, 25, 7119 - 7130.

104 M. Fischer, M. Schmidtmann and R. Beckhaus
To Coordinate or not to Coordinate: The Special Role of Chalcogen Ether Functionalities in the Design of Twofold Functionalized Cyclopentadienyl Ligands [Cp,O,Ch(Ch = S, Se)]
Z. Anorg. Allg. Chem. 2019, 645, 595 - 604.

103 T. Oswald, M. Fischer, N. Struckmann, M. Schmidtmann and R. Beckhaus
Reaction of Pentafulvene Titanium and Zirconium Complexes with Phosphorus Ylides: Stoichiometric Reactions and Catalytic Intramolecular Proton Shuttles
Organometallics 2019, 38, 829 - 843.

102 M. Fischer, K. Schwitalla, S. Baues, M. Schmidtmann and R. Beckhaus:
Frustrated Lewis Pair Behaviour of Cationic Titanium Complexes with Tridentate Cp,O,N-Ligands: Highly Efficient Syntheses and Activation Reactions of C-X Bonds (X = H, F, Cl)
Dalton Transactions 2019, 48, 1516 - 1523.

101 M. Fischer, H. Steinert, M. Schmidtmann and R. Beckhaus,
Teaching c Phosphanylimines the Titanaaziridine Coordination Mode
Dalton Transactions 2019, 48, 1936 - 1940.

65 M. Manßen, N. Lauterbach, J. Dörfler, M. Schmidtmann, W. Saak, S. Doye, R. Beckhaus
Effizienter Zugang zuTitanaaziridinen durch C-H Aktivierung von N-Methylanilinen / Efficient Access to Titanaaziridines via C-H Activitation of N-Methylanilines at Ambient Temperature
Angew. Chem., 127, 2015, (14), 4458 - 4462; Angew. Chem. Int. ed, 54, 2015, (14), 4383 - 4387.

64 C. Wolff, A. Gottschlich, J. England, K. Wieghardt, W. Saak, D. Haase, R. Beckhaus
Molecular and Electronic Structures of Organometallic Mono- and Dinuclear Titanium Complexes Containing π-Radical Anions of 2,2'-bipyridine and 1,10-phenanthroline. An Experimental and DFT Computational Study
Inorganic Chem., 64, 2015, (10), 4811 - 4820.

63 F. Loose, M.Schmidtmann, W. Saak R. Beckhaus
Imines in the titanium coordination sphere - Highly reactive titanaaziridines and larger titanacycles formed by subsequent C-C coupling reactions
Eur. J. Inorg. Chem., 2015, 5171 - 5187.

62. O. N. Frey, T. Stalling, F. Schlüter, W. Saak, M. Schmidtmann, D. Haase, R. Beckhaus Remarkably Stability of Tetrabenzo[a,c,g,i]fluorenyl Ammonium Salts in Water: Syntheses, Reactions, and Crystal Structures
Dalton Trans, 2015, 1085 - 1092.

61 F. Loose, I. Plettenberg, D. Haase, W. Saak, M. Schmidtmann, A. Schäfer, T. Müller, R. Beckhaus
Aromatic Imines in the Titanocene Coordination Sphere-Titanaaziridine vs 1-Aza-2-titanacyclopent-4-ene Structures
Organometallics 2014, 33, 6785 - 6795.

60 C. Adler, G. Tomaschun, M. Schmidtmann, R. Beckhaus
Remarkably Robust Mono-n-butyl Group IV Dicyclohexylamido Complexes {(Cy)₂N}₃M(n-butyl) (Cy: cyclohexyl [C₆H₁₁], M: Ti, Zr)
Organometallics 2014, 33, 7011 - 7014.

59 H. Ebert, V. Timmermann, T. Oswald, W. Saak, M. Schmidtmann, M. Friedemann, D. Haase, R. Beckhaus
Synthesis and Reactivity of Bis(η⁵:η¹-pentafulvene)zirconium Complexes
Organometallics, 2014, 33, 1440 - 1452.

58 C. Adler, A. Bekurdts, D. Haase, W. Saak, M. Schmidtmann, R. Beckhaus
Bulky Titanium Amides: C-H Bond Activation under Mild Conditions
Eur. J. Inorg. Chem. 2014, 1289 - 1302; Eur. J. Inorg. Chem. 2014, 8, 1262.

57 C. Maibohm. M. Rastedt, F. Kutscher, O. N. Frey, R. Beckhaus, K. Al-Shamery and H.-G. Rubahn
Optical waveguiding and temperature dependent photoluminescence of nanotubulars grown from molecular building blocks
Chem. Phys. Lett. 590, 2013, 98 - 91.

56 J. Luo, J. Hu, W. Saak, R. Beckhaus, G. Wittstock, I. F. J. Vankelecom, C. Agert and O. Conrad
Protic ionic liquid and ionic melts prepared from methanesulfonic acid and 1H-1,2,4-triazole as high temperature PEMFC electrolytes
J. Mater. Chem. 21, 2011, 10426 - 10436.

55 T. Janssen, R. Severin, M. Diekmann, M. Friedemann, D. Haase, W. Saak, S. Doye and R. Beckhaus
Bis(h5:h1-pentafulvene)titanium Complexes: Catalysts for Intramolecular Alkene Hydroamination and Reagents for Selective Reactions with N-H-acidic Substrates
Organometallics 29, 2010, No. 7 1806 - 1817.

54 M. Jordan, W. Saak, D. Haase and R. Beckhaus
Bridging Azines in the Coordination Sphere of Low Valent Vanadocene Derivatives
Organometallics 29, 2010, No. 22 5859 - 5870.

53 L. Scheffel, R. Beckhaus and I. Parchmann
Which contents belong to the basic concept of structure-property relationships in school?
Natural Sciences in the Chemistry Classroom, 2010, 1 - 8.

52 A. Scherer, D. Haase, W. Saak, R. Beckhaus, A. Meetsma and M. W. Bouwkamp
Low-valent Pentafulvene Titanium Dinitrogen Complexes as a Precursor for Cationic Titanium Complexes
Organometallics 28, 2009, No. 24 6969 - 6974.

51. O. Theilmann, W. Saak, D. Haase and R. Beckhaus
Reactions of Low Valent Titanocene(II) Fragments with trans-4,4`-Azobispyridine (RN=NR, R: C₅H₄N): Formation of Tetranuclear Molecular Squares by trans-cis Isomerisation
Organometallics 28, 2009, 2799 - 2807.

50 T. Jung, R. Beckhaus, T. Klüner, S. Höfener and W. Klopper
Unexpected Trimerisation of Pyrazine in the Coordination Sphere of Low-Valent Titanocene Fragments
Journal of Chemical Theory and Computation 5, 2009, No. 8 2044 - 2049.

49 I. Prochnow, R. Kubiak, O. N. Frey, R. Beckhaus and S. Doye
Tetrabenzyltitanium: An Improved Catalyst for the Activation of sp3 C H Bonds Adjacent to Nitrogen Atoms
ChemCatChem 1, 2009; 162 - 172.

48 J. Krahmer, R. Beckhaus, W. Saak, D. Haase
Chelating Complexes of Diethylzinc and ZnCl₂ with 2,2-Bipyridine and 1,6,7,12,13,18-Hexaazatrinaphthylene (HATN) as Ligands
Z. Anorg. Allgem. Chem., 2008, 634 (10), 1696 - 1702.

47 K. Schröder, D. Haase, W. Saak, W. P. Kretschmer, A. Lützen, R. Beckhaus
Tetrabenzo[a,c,g,i]titanium(III) and -(IV) Complexes: Syntheses, Reactions and Catalytic Application
Organometallics, 2008, 27 (8), 1859 - 1868.

46 M. Jordan, W. Saak, D. Haase, R. Beckhaus
Ring Slipped (2,2'-bipyridine)(η³-cyclopentadienyl)(η⁵-cyclopentadienyl)vanadium(II) and Its Oxidation to (2,2'-bipyridine)bis(η⁵-cyclopentadienyl)vanadium(III) Tetraphenylborate
Eur. J. Inorg. Chem., 2007, 33, 5168 - 5172.

45 I. Piglosiewicz, R. Beckhaus, G. Wittstock, W. Saak, D. Haase
Selective Oxidation and Reduction of Trinuclear Titanium(II) Hexaazatrinaphthylene Complexes - Synthesis, Structure and Electrochemical Investigations
Inorg. Chem., 2007, 46 (18), 7610 - 7620.

44 R. Koch, E. Bölter, J. Stroot, R. Beckhaus
Theoretical Studies on Titanium Pentafulvene Complexes
J. Organomet. Chem., 2006, 691, 4539 - 4544.

43 K. Schröder, D. Haase, W. Saak, A. Lützen, R. Beckhaus
Tetrabenzo[a,c,g,i]fluorenyllithium and η⁵-tetrabenzo[a,c,g,i]fluorenyltitanium Complexes
Organometallics, 2006, 25 (16), 3824 - 3836.

42 M. Diekmann, G. Bockstiegel, A. Lützen, M. Friedemann, D. Haase, W. Saak, R. Beckhaus, D. Haase, W. Saak
Chiral Bis(η⁵,η¹-Pentafulvene) Titanium Complexes
Organometallics, 2006, 25 (2), 339 - 348.

41 F. Studt, N. Lehnert, B. E. Wiesler, A. Scherer, R. Beckhaus, F. Tuczek
Spectroscopic Comparison of Dinuclear ^Ti+ and ^Ti2+ μ-η¹:η¹ Dinitrogen Complexes with Cp*/Pentafulvene and Amine/Amide Ligation: Moderate versus High Activation of N₂
Eur. J. Inorg. Chem., 2006, 2, 291 - 297.

40 I. M. Piglosiewicz, R. Beckhaus, D. Haase, W. Saak
Dehydroaromatisation of Quinoxalines: One-Step Syntheses of Trinuclear 1,6,7,12,13,18-Hexaazatrinaphthylene Titanium Complexes
J. Am. Chem. Soc., 2005, 127(41), 14190 - 14191.

39 A. Scherer, K. Kollak, A. Luetzen, M. Friedemann, D. Haase, W. Saak, R. Beckhaus
Low-Valent Titanium-Pentafulvene Complexes - Formation of Dinuclear Titanium-Nitrogen Complexes
Eur. J. Inorg. Chem., 2005, 6, 1003 - 1010.

38 I. M. Piglosiewicz, S. Kraft, R. Beckhaus, D. Haase, W. Saak
Selective C-H and C-F Bond Activation Reactions of Pyridine and Fluoropyridines - Formation of Binuclear μ-X Titanocene Complexes (X = H, F) with α-Functionalised N-Heterocycles
Eur. J. Inorg. Chem., 2005, 5, 938 - 945.

37 S. Kraft, E. Hanuschek, R. Beckhaus, D. Haase, W. Saak
Titanium-Based Molecular Squares and Rectangles: Syntheses by Self-Assembly Reactions of Titanocene Fragments and Aromatic N-Heterocycles
Chem. Eur. J., 2005, 3, 969 - 978.

36 S. Kraft, R. Beckhaus, D. Haase, W. Saak
Directed Reduction of Six-Membered Nitrogen Heterocycles - Selective Formation of Polynuclear Titanium Complexes
Angew . Chem., 2004, 116, 1609 - 1614; Angew. Chem. Int. ed., 2004, 12, 1583 - 1587.

35 J. Stroot, A. Lützen, M. Friedemann, W. Saak, R. Beckhaus
Pentafulvene Complexes of Titanium - Synthesis, Structure, and Fluxional Behaviour of Cp'Ti{η⁶ -C₅H₄=C(p-Tol)₂}Cl (Cp' = Cp*, Cp)
Z. anorg. allg. chem., 2002, 628, 797 - 802.

34 J. Stroot, D. Haase, W. Saak, R. Beckhaus
Reactions of Pentafulvene Complexes of Titanium with Nitriles and Iso-Nitriles - Synthesis and Isomerisations of σ, π-Chelate Complexes with Cp ~ N-Ligands
Z. anorg. allg. chem., 2002, 628, 755 - 761.

33. J. Stroot, D. Haase, W. Saak, R. Beckhaus
Crystal Structure of (η⁵ -Pentamethylcyclopentadienyl)(η⁵ -1-(2,2-dimethylpropyl) cyclopentadienyl)titaniumdichloride, C₂₀H₃₀Cl₂Ti
Z. Kristallogr. NCS, 2002, 217, 49 - 50.

32. J. Stroot, D. Haase, W. Saak, R. Beckhaus
Crystal Structure of (η⁵ -pentamethylcyclopentadienyl)(η⁵ -1-(2,2-dimethylpropyl) cyclopentadienyl)(hydroxy)-titanium chloride C₂₀H₃₁ClOTi
Z. Crystallogr. NCS, 2002, 217, 47 - 48.

31 C. Santamaria, R. Beckhaus, D. Haase, R. Koch, W. Saak, I. Strauss
Reactions of the Titanaallene Intermediate [Cp*₂Ti=C=CH₂] with Isonitriles: An Approach to the Chemistry of Radialene Type Molecules
Organometallics, 2001, 7, 1354 - 1359.

30 R. Beckhaus, C. Santamaria
Carbene Complexes of Titanium Group Metals - Formation and Reactivity
J. Organomet. Chem., 2001, 617 - 618, 81 - 97.

29 R. Beckhaus
Reactivity principles of metallocene derivatives of early transition metals
Nachrichten aus Chemie, Technik und Laboratorium, 1998, 46, 611 - 623.

28 N. Peulecke, V. V. Burlakov, B. Heller, W. Baumann, A. Spannenberg, R. Kempe, U. Rosenthal, R. Beckhaus
Terminal Alkynes in the Coordination Sphere of Titanocene Complexes - Elementary Steps in Catalytic Dimerisations and Oligomerisations of Alkynes
Z. anorg. allg. chem. 1998, 624, 129 - 134.

27 D. Thomas, N. Peulecke, V. V. Burlakov, B. Heller, W. Baumann, A. Spannenberg, R. Kempe, U. Rosenthal, R. Beckhaus
Catalyst deactivations in acetylene polymerisation with titanocene and zirconocene complexes of bis(trimethylsily) acetylene
Z. anorg. allg. chem. 1998, 624, 919 - 924.

26. R. Beckhaus, J. Oster, R. Wang, U. Böhme
Synthesis of Semibridging m-Vinylidene Titanium-Copper and -Gold Complexes. Crystal and Molecular Structure of Cp*₂Ti(Cl)(μ-C=CH₂)AuPPh₃
Organometallics, 1998, 17, 2215 - 2221.

25 R. Beckhaus, M. Wagner, R. Wang
Realisation and crystal structure of the azavinylidene derivative Cp*₂Ti(CH=CH₂)(N=CPh₂) starting from the thermally formed titanium metal intermediate[Cp*₂Ti=C=CH₂]
Z. anorg. allg. Chem., 1998, 624, 277 - 280.

24. R. Beckhaus, M. Wagner, U. Rosenthal, R. Kempe, A. Spannenberg, W. Baumann
Terminal Alkynes in the Coordination Sphere of Titanocene Complexes - Elementary Steps in Catalytic Dimerisations and Oligomerisations of Alkynes
Z. anorg. allg. chem., 1998, 624, 129 - 134.

23. R. Beckhaus, M. Wagner, R. Wang
Synthesis and Structural Characterisation of Azatitanacyclobutane Derivatives
Eur. J. Inorg. Chem. 1998, 253 - 256.

22 R. Beckhaus, J. Oster, B. Ganter, U. Englert
Vinyltitanium Complexes Containing the [2-(N,N-Dimethyl-amino)ethyl]tetramethylcyclopentadienyl Ligand Cp*N - Generation and Reactivity of the Vinylidene Intermediate, [(Cp*N)(Cp*)Ti=C=CH₂] (Cp*N = η⁵-C₅Me₄(CH₂)₂NMe₂, Cp* = η⁵-C₅Me₅)
Organometallics, 1997, 16, 3902 - 3909.

21 R. Beckhaus, J. Sang, T. Wagner, U. Böhme
Regioselective Reactions of Isothiocyanates with the Titanocene Vinylidene Fragment [Ti(=C=CH₂)(η-C₅Me₅)₂]. Crystal and Molecular Structure of [Ti{SC(=N(C₆H₁₁)C=CH₂}(η-C₅Me₅)₂]
J. Chem. Soc. Dalton Trans. 1997, 2249 - 2256.

20. R. Beckhaus
C₂ Building Blocks in the Coordination Sphere of Electron Poor Transition Metals. Aspects of the Chemistry of Early-Transition-Metal Carbenoid Complexes
J. Chem. Soc. Dalton Trans. 1997, 1991 - 2002.

19 R. Beckhaus, I. Strauß, T. Wagner
Preparation and crystal structure analysis of bis(p-pentamethylcyclopentadienyl)(2-methylene)- (3-diphenylmethylene)oxatitanacyclobutane Cp*₂TiOC(=CPh₂)CC=CH₂
Z. anorg. allg. chem. 1997, 623, 654 - 658.

18. R. Beckhaus
Carbenoid complex compounds of electron-deficient transition metals - Syntheses of and with short-lived synthesis building blocks
Angew. Chem. 1997, 109, 694 - 722; Angew. Chem., Int. ed. Engl. 1997, 36, 686 - 713.

17 R. Beckhaus, J. Oster, J. Sang, I. Strauß, M. Wagner
The Story of 1-Alkenyl Complexes of Early Transition Metals - A Low Temperature Access to the Versatile Titana-Allene Building Block [Cp*₂Ti=C=CH₂]
Synlett 1997, 3, 241 - 249.

16. R. Beckhaus, J. Sang, U. Englert, U. Böhme
Regioselective Reactions of 1,3-Diynes with the Titanocene Vinylidene Fragment [Cp*₂Ti=C=CH₂]. Crystal and Molecular Structure of Cp*₂TiC(CCSiMe₃)=C(SiMe₃)C=CH₂
Organometallics 1996, 15, 4731 - 4736.

15 R. Beckhaus, J. Oster, R. Kempe, A. Spannenberg
Intermolecular carbene-carbene coupling of a nucleophilic vinylidene ligand with an electrophilic 1-methoxyethylidene ligand
Angew. Chem. 1996, 108, 1636 - 1638; Angew. Chem., Int. ed. Engl. 1996, 35, 1565 - 1567.

14 R. Beckhaus, J. Sang, T. Wagner, B. Ganter
Reactivity of Acetylenes Toward the Titanocene Vinylidene Fragment [Cp*₂Ti=C=CH₂₂]. Formation of Methylenetitanacyclobutenes and Vinyltitanium Acetylides. Crystal and Molecular Structures of Cp*₂TiCR"=CR""C=CH₂ (R" = R""= CH₃; R" = SiMe₃, R"" = C₆H₅) and Cp*₂Ti(CH=CH₂)(CCPh)
Organometallics 1996, 15, 1176 - 1187.

13 R. Beckhaus, J. Oster, R. Loo
a-H transfers on vinyl metal compounds - Representation of (h⁵-cyclopentadienyl(h⁵-pentamethylcyclopentadienyl)- (2-methylidene)titanacyclobutane
J. Organometal. Chem. 1995, 501, 321 - 326.

12. R. Beckhaus, I. Strauß, T. Wagner,
Synthesis and structure of 1-aza- and 1-phospha-2-titanacyclobut-4-enes
Angew. Chem. 1995, 107, 738 - 740; Angew. Chem., Int. ed. Engl. 1995, 34, 688 - 690.

11. R. Beckhaus, J. Oster
On the reactivity of isomeric heterodinuclear Fischer-carbene complexes with titanium oxetane and titanium oxolene substructures - cycloreversion and insertion reactions
Z. anorg. allg. chem. 1995, 621, 359 - 364.

10 R. Beckhaus, J. Sang, J. Oster, T. Wagner
On the reaction behaviour of a vinylidene titanocene intermediate towards protic agents - selective syntheses of 1-alkenyltitanocene compounds
J. Organometal. Chem. 1994, 484, 179 - 190.

9. R. Beckhaus, I. Strauß, T. Wagner
On the reaction behaviour of titanocene vinylidene towards enolizable ketones: Cp*₂Ti(CH=CH₂)(OC(=CH₂)C₆H₁₁) - an enolate with an unusually elongated Ti-O-C angle
J. Organometal. Chem. 1994, 464, 155 - 161.

8. R. Beckhaus, J. Oster, T. Wagner
Cyclic isomeric four- and five-membered heterodinuclear Fischer carbene complexes - formed from a vinylidene titanocene fragment and metal carbonyls
Chem. Ber. 1994, 127, 1003 - 1013.

7 R. Beckhaus, I. Strauß, T. Wagner, P. Kiprof
Surprising differentiation in the cycloaddition of cumulenes and heterocumulenes to a vinylidene titanocene: formation of four- and five-membered titanacycles
Angew. Chem. 1993, 105, 281-283; Angew. Chem., Int. ed. Engl. 1993, 32, 264 - 266.

6 R. Beckhaus, T. Wagner, C. Zimmermann, E. Herdtweck
Bis(π-pentamethylcyclopentadienyl)(2-methylidene)titanacyclobutane: Selective insertion of isonitriles and diphenylketene - formation of five- and six-membered metallacycles
J. Organometal. Chem. 1993, 460, 181 - 189.

5 D. Selent, R. Beckhaus, J. Pickardt
Heterodinuclear Titanium-Cobalt Complexes: Syntheses and Properties. X-ray Structure of [(tert-C₄H₉O)₃TiCo(CO)₄] (Ti-Co)
Organometallics 1993, 12, 2857 - 2860.

4. R. Beckhaus
Methylidenetitanacyclobutane vs. titanocene-vinylidene - Versatile Building Blocks
Organic Synthesis via Organometallics (OSM 4), Proceedings of the Fourth Symposium in Aachen, July 15th to 18th, 1992, D. Enders, H.-J. Gais, W. Keim (eds.),
Vieweg Verlag, Braunschweig 1993, 131 - 149.

3 D. Selent, R. Beckhaus, T. Bartik
Synthesis and characterisation of a stable heterobimetallic titanium-cobalt complex with unbridged Ti-Co bond
J. Organometal. Chem. 1991, 405, C15 - C18.

2. R. Beckhaus
Zur Chemie von Vinylverbindungen elektronenarmer Übergangsmetalle (Habilitation Thesis),
School of Natural Sciences, Technische Hochschule Leuna-Merseburg; Mathematisch-Naturwissen-schaftliche School der RWTH Aachen; 1991/1993.

1. R. Beckhaus, K.-H. Thiele, D. Ströhl
Bis(pentamethylcyclopentadienyl)metal divinyl compounds of titanium, zirconium and hafnium; formation of titanacyclobutane and zirconacyclopent-2-ene derivatives
J. Organometal. Chem. 1989, 369, 43 - 54.