Coordinatively unsaturated molybdenum complexes with chelating cycloheptatrienyl-phosphane ligands and their use in transition metal catalysis |
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| Affiliation: | 1. Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, 39106 Magdeburg, Germany;2. Institut für Anorganische und Analytische Chemie der TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany;1. Laboratory for Biomechanics and Biomaterials, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany;2. CrossBIT, Center for Biocompatibility and Implant-Immunology, Feodor-Lynen-Straße 31, 30625 Hannover, Germany;3. Clinic of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625 Hannover, Germany;4. Institute for Technical Chemistry, Braunschweig University of Technology, Hans-Sommer-Straße 10, 38106 Braunschweig, Germany;5. Julius Wolff Institute and Center for Musculoskeletal Surgery, Charité — Universitätsmedizin Berlin, Augustenburger Platz 1, 13353, Berlin, Germany |
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| Abstract: | The synthesis of the tetrahydroborate complex [(2-iPr2PC6H4-η7-C7H6)Mo(η2-BH4)(P–Mo)] 3 containing the linked cycloheptatrienyl-phosphane ligand [2-(diisopropylphosphanyl)phenyl]cycloheptatrienyl is described, which provides the possibility to generate the 14-electron complex [(2-iPr2PC6H4-η7-C7H6)Mo(P–Mo)]+ (4) on treatment with dimethylanilinium salts such as [HNMe2Ph][BPh4]. Generation of (4)BPh4 in the presence of 2,6-dimethylphenyl isocyanide, 2,5-norbornadiene or phenylacetylene affords the diisocyanide complex (5a)BPh4, the diolefin complex (5b)BPh4 and the alkyne complex (6)BPh4, respectively. The latter complex can be used for the catalytic oligomerization of phenylacetylene affording predominantly the cyclotrimers 1,3,5- and 1,2,4-triphenylbenzene. |
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