Ruthenium(II) complexes bearing pyridine‐based tridentate and bidentate ligands: catalytic activity for transfer hydrogenation of aryl ketones |
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| Authors: | Osman Dayan Serkan Dayan İbrahim Kani Bekir Çetinkaya |
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| Institution: | 1. Department of Chemistry, ?anakkale Onsekiz Mart University, , 17020 ?anakkale, Turkey;2. Department of Chemistry, Faculty of Science, Erciyes University, , 38039 Kayseri, Turkey;3. Department of Chemistry, Faculty of Science, Anadolu University, , 26470 Eski?ehir, Turkey;4. Department of Chemistry, Ege University, , 35100 Izmir, Turkey |
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| Abstract: | Ru(II) complexes of the general formula RuCl2(′ ′)(L)] (1: ′N = Nb, L = MeOH; 2: ′N = Nb, L = CH3CN; 3: ′N = Nd, L = CH3CN; 4: ′N = Np, L = CH3CN), Ru(p‐cymene)( a–b)Cl]Cl (5a: N Na = 2,2′‐bipyridine; 5b: N Nb = 4,4′‐dimethyl–2,2′‐bipyridine), Ru(′ ′)( a–b)Cl]Cl (6a: ′N = Nb,  a = 2,2′‐bipyridine; 6b: ′N = Nb,  b = 4,4′‐dimethyl‐2,2′‐bipyridine; 7a: ′N = Nd,  a = 2,2′‐bipyridine; 7b: ′N = Nd,  b = 4,4′‐dimethyl‐2,2′‐bipyridine; 8a: ′N = Np,  a = 2,2′‐bipyridine; 8b: ′N = Np,  b = 4,4′‐dimethyl‐2,2′‐bipyridine) and Ru(′ ′)( a)Cl]BF4 (9a: ′N = Nb;  a = 2,2′‐bipyridine) were synthesized from the corresponding RuCl2(p‐cymene)]2 dimer, ′ ′ and  a–b ligands. The compounds were characterized by elemental analysis, IR and NMR. Complex 9a was studied by X‐ray diffraction, confirming its cationic‐mononuclear RuCl(b b)( a)]+ nature. The synthesized Ru(II) complexes (1–8) were employed as catalysts for the transfer hydrogenation of ketones to secondary alcohols in the presence of KOH using 2‐propanol as a hydrogen source at 82°C. The rates of the transfer hydrogenation reactions strongly depended on the type of  and ancillary ligands. Copyright © 2012 John Wiley & Sons, Ltd. |
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| Keywords: | tridentate triamine ligands Ru(II) complexes transfer hydrogenation |
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