Abstract
Treatment of the (diethylaminomethyl-picolyl)pyrazolium (A3) with NaOH in dichloromethane affords the pincer ligand (L) bearing a 1,2-dihydropyrimidine unit. Reaction of [RuCl2(DMSO)4] and the ligand (L) affords the complex [RuCl2(L)(DMSO)] (Ru1). Removal of the chlorides from Ru1 with either NaBF4 or KPF6 in CH3CN produces the complexes [Ru(L)(CH3CN)3](BF4)2 (Ru2) and [Ru(L)(CH3CN)3](PF6)2 (Ru3), respectively. Ru2 has been characterized with X-ray crystallography. All of the new ruthenium complexes (Ru1-Ru3) are catalytically active in the Oppenauer-type oxidation of secondary alcohols. Among them, the complex Ru1 is the most active. Steric effects were observed from the outcome of substituted acetophenones.
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