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Issue 45, 2016
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Synthesis, structural characterization and catalysis of ruthenium(II) complexes based on 2,5-bis(2′-pyridyl)pyrrole ligand

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Abstract

Treatment of the 2,5-bis(2′-pyridyl)pyrrolato (PDP) anion with {Ru(COD)Cl2}n in THF readily yielded [Ru(PDP)(COD)Cl] (1) in almost quantitative yield. Anion metathesis of 1 in organic solvent by NO3 and OTf (OTf = triflato) gave [Ru(PDP)(COD)(NO3)] (2) and [Ru(PDP)(COD)(OTf)] (3), and in aqueous solution by BF4 and PF6 afforded aqueous complexes [Ru(PDP)(COD)(H2O)](BF4) (4+·BF4) and [Ru(PDP)(COD)(H2O)](PF6) (4+·PF6), respectively. Treatment of 1 with PhICl2 in CH2Cl2 afforded 5 with halogenated pyrrole. These complexes exhibit similar structure, including one Ru(II) atom, one 2,5-bis(2′-pyridyl)pyrrole and one monodentate anion or aqua ligand. Each Ru(II) tightly binds to three adjacent coplanar sites of PDP ligand to form a meridional configuration. Complex 1 with NaIO4 as the oxidant in EtOAc–CH3CN–H2O (ratio = 3 : 1 : 2) proved to be highly effective in the catalytic oxidation of olefins to carbonyl products.

Graphical abstract: Synthesis, structural characterization and catalysis of ruthenium(ii) complexes based on 2,5-bis(2′-pyridyl)pyrrole ligand

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Publication details

The article was received on 05 Sep 2016, accepted on 13 Oct 2016 and first published on 17 Oct 2016


Article type: Paper
DOI: 10.1039/C6DT03464K
Citation: Dalton Trans., 2016,45, 18113-18119
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    Synthesis, structural characterization and catalysis of ruthenium(II) complexes based on 2,5-bis(2′-pyridyl)pyrrole ligand

    Y. Zhong, H. Xiao and X. Yi, Dalton Trans., 2016, 45, 18113
    DOI: 10.1039/C6DT03464K

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