Silica-supported cyclopentadienyl-rhodium(I), -cobalt(I), and -titanium(IV) complexes |
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| Institution: | 1. Department of Chemistry, PO Box 339, University of the Free State, 9300 Bloemfontein, South Africa;2. Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway;3. Center for Theoretical and Computational Chemistry (CTCC), University of Tromsø, N-9037 Tromsø, Norway;4. Department of Chemistry, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa;1. Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14115-4838, Tehran, Islamic Republic of Iran;2. Department of Chemistry, Faculty of Science, University of Qom, PO Box 37185-359, Qom, Islamic Republic of Iran;3. School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia;1. Department of Solid State Physics, Lesya Ukrainka Eastern European National University, 13 Voli Ave., Lutsk, 43025, Ukraine;2. Department of Inorganic and Physical Chemistry, Lesya Ukrainka Eastern European National University, 13 Voli Ave., Lutsk, 43025, Ukraine;3. Institute of Electronic and Control System, Faculty of Electrical Engineering, Czestochowa University of Technology, Armii Krajowej 17, Czestochowa, Poland;4. Institute of Physics, J. Dlugosz University, Armii Krajowej 13/15, Czestochowa, Poland |
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| Abstract: | The silylated cyclopentadiene derivative, (MeO)3Si(CH2)3C5H5, synthesised from commerically-available (MeO)3Si(CH2)3Cl, has been used to prepare the complexes η5-(MeO)3Si(CH2)3C5H4]Rh(CO)2, η5-(MeO)3Si(CH2)3C5H4]Rh(COD) (COD = cyclo-octa-1,5-diene), and η5-(MeO)3Si(CH2)3C5H4]2TiCl2. The complex η5-(MeO)3Si(CH2)3C5H4]TiCl3, prepared by reaction of NaC5H4(CH2)3Si(OMe)3 with TiCl4 (1/1 molar ratio) and also by reaction of η5-(MeO)3Si(CH2)3C5H4]Ti(OEt)3 with CH3COCl, proved to be very unstable. Attempts to synthesise the complex η5-(MeO)3Si(CH2)3C5H4](η5-C5H5)TiCl2, either by reaction of η5-(MeO)3Si(CH2)3C5H4]TiCl3 with NaC5H4 or reaction of (η5-C5H5)TiCl3 with NaC5H4(CH2)3Si(OMe)3, gave none of the expected product and only (η5-C5H5)2TiCl2 could be isolated from these reactions. The cyclo-octadiene rhodium complex supported on silica has been shown to be an efficient cyclotrimerization catalyst, and the silica-supported titanium complex (SIL-(CH2)3C5H4)2TiCl2 is, after reduction with butyllithium, an efficient and selective catalyst for the hydrogenation of alk-1-enes. |
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