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Organometallic ruthenium, rhodium and iridium complexes containing a P-bound thiophene-2-(N-diphenylphosphino)methylamine ligand: Synthesis, molecular structure and catalytic activity |
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| Authors: | Murat Aydemir Nermin Meric Bahattin Gümgüm Ertan ?ahin |
| Institution: | a Dicle University, Department of Chemistry, 21280 Diyarbak?r, Turkey b Middle East Technical University, Department of Chemistry, 06531 Ankara, Turkey c Atatürk University, Department of Chemistry, 25240 Erzurum, Turkey |
| Abstract: | Reaction of Ph2PNHCH2-C4H3S with Ru(η6-p-cymene)(μ-Cl)Cl]2, Ru(η6-benzene)(μ-Cl)Cl]2, Rh(μ-Cl)(cod)]2 and Ir(η5-C5Me5)(μ-Cl)Cl]2 yields complexes Ru(Ph2PNHCH2-C4H3S)(η6-p-cymene)Cl2], 1, Ru(Ph2PNHCH2-C4H3S)(η6-benzene)Cl2], 2, Rh(Ph2PNHCH2-C4H3S)(cod)Cl], 3 and Ir(Ph2PNHCH2-C4H3S)(η5-C5Me5)Cl2], 4, respectively. All complexes were isolated from the reaction solution and fully characterized by analytical and spectroscopic methods. The structure of Ru(Ph2PNHCH2-C4H3S)(η6-benzene)Cl2], 2 was also determined by single crystal X-ray diffraction. 1-4 are suitable precursors forming highly active catalyst in the transfer hydrogenation of a variety of simple ketones. Notably, the catalysts obtained by using the ruthenium complexes Ru(Ph2PNHCH2-C4H3S)(η6-p-cymene)Cl2], 1 and Ru(Ph2PNHCH2-C4H3S)(η6-benzene)Cl2], 2 are much more active in the transfer hydrogenation converting the carbonyls to the corresponding alcohols in 98-99% yields (TOF ≤ 200 h−1) in comparison to analogous rhodium and iridium complexes. |
| Keywords: | Aminophosphine Transfer hydrogenation Ruthenium Rhodium Iridium X-ray diffraction |
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