New Polydentate Ligand and Catalytic Properties of the Corresponding Ruthenium Complex During Sulfoxidation and Alkene Epoxidation
Résumé
Bis(diimine)-ruthenium complexes constitute a class of catalysts with good activity for oxidation reactions, such as sulfoxidation and epoxidation. The synthesis and the full characterization of a new ruthenium complex bearing an original pentadentate ligand (L5pyr for 2,6-bis-(6-ethyl-2,2′-bipyridyl)-pyridine) is reported. Comparison of its activity with regard to[Ru(bpy) 2(CH 3CN) 2] 2+ and [Ru(bpy) 2(py)(CH 3CN)] 2+ during alkene and sulfide oxidation allowed us to conclude that the addition of a fifth pyridine ligand in the coordination sphere improves the efficiency of the catalyst. Moreover, under these oxidation conditions a hydroxylation of the ligand L5pyr led to a better activity than its analogue [Ru(bpy) 2(py)(CH 3CN)] 2+, especially during epoxidation of alkenes by PhI(OAc) 2.
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