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Photochemical Activation of Ruthenium(II)–Pyridylamine Complexes Having a Pyridine-N-Oxide Pendant toward Oxygenation of Organic Substrates

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Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
Department of Material and Life Science, Graduate School of Engineering, Osaka University, and ALCA, Japan Science and Technology Agency (JST), 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
Graduate School of Life Science, University of Hyogo, Kouto, Hyogo 678-1297, Japan
Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, South Korea
Cite this: J. Am. Chem. Soc. 2011, 133, 44, 17901–17911
Publication Date (Web):September 26, 2011
https://doi.org/10.1021/ja207572z
Copyright © 2011 American Chemical Society
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Abstract

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Ruthenium(II)–acetonitrile complexes having η3-tris(2-pyridylmethyl)amine (TPA) with an uncoordinated pyridine ring and diimine such as 2,2′-bipyridine (bpy) and 2,2′-bipyrimidine (bpm), [RuII3-TPA)(diimine)(CH3CN)]2+, reacted with m-chloroperbenzoic acid to afford corresponding Ru(II)–acetonitrile complexes having an uncoordinated pyridine-N-oxide arm, [RuII3-TPA-O)(diimine)(CH3CN)]2+, with retention of the coordination environment. Photoirradiation of the acetonitrile complexes having diimine and the η3-TPA with the uncoordinated pyridine-N-oxide arm afforded a mixture of [RuII(TPA)(diimine)]2+, intermediate-spin (S = 1) Ru(IV)–oxo complex with uncoordinated pyridine arm, and intermediate-spin Ru(IV)–oxo complex with uncoordinated pyridine-N-oxide arm. A Ru(II) complex bearing an oxygen-bound pyridine-N-oxide as a ligand and bpm as a diimine ligand was also obtained, and its crystal structure was determined by X-ray crystallography. Femtosecond laser flash photolysis of the isolated O-coordinated Ru(II)–pyridine-N-oxide complex has been investigated to reveal the photodynamics. The Ru(IV)–oxo complex with an uncoordinated pyridine moiety was alternatively prepared by reaction of the corresponding acetonitrile complex with 2,6-dichloropyridine-N-oxide (Cl2py-O) to identify the Ru(IV)–oxo species. The formation of Ru(IV)–oxo complexes was concluded to proceed via intermolecular oxygen atom transfer from the uncoordinated pyridine-N-oxide to a Ru(II) center on the basis of the results of the reaction with Cl2py-O and the concentration dependence of the consumption of the starting Ru(II) complexes having the uncoordinated pyridine-N-oxide moiety. Oxygenation reactions of organic substrates by [RuII3-TPA-O)(diimine)(CH3CN)]2+ were examined under irradiation (at 420 ± 5 nm) and showed selective allylic oxygenation of cyclohexene to give cyclohexen-1-ol and cyclohexen-1-one and cumene oxygenation to afford cumyl alcohol and acetophenone.

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Figures S1–S8 and crystallographic data for 2a, 3a, and 4b in CIF format. This material is available free of charge via the Internet at http://pubs.acs.org.

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  27. Simon A. Cotton. Iron, ruthenium and osmium. Annual Reports Section "A" (Inorganic Chemistry) 2012, 108 , 186. https://doi.org/10.1039/c2ic90010f

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