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Issue 34, 2012
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Phenyl substituted indenylphosphine ruthenium complexes as catalysts for dehydrogenation of alcohols

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Abstract

Thermal treatment of (1H-inden-3-yl)dicyclohexylphosphinium tetrafluoroborate (1) and (3-mesityl-1H-inden-3-yl)dicyclohexylphosphinium tetrafluoroborate (3) with tBuONa followed by [(η6-cymene)RuCl2)]2 in methanol gave the adduct {(η6-cymene)RuCl2[(1H-inden-3-yl)PCy2]} (6) and {(η6-cymene)RuCl2[(3-mesityl-1H-inden-3-yl)PCy2]} (7), respectively. Thermal treatment of (2-phenyl-1H-inden-3-yl)dicyclohexylphosphinium tetrafluoroborate (4) with tBuONa followed by [(η6-cymene)RuCl2)]2 or RuCl3·3H2O in methanol gave {Ru[κ(P):(η6-2-phenyl-1H-inden-3-yl)PCy2]Cl2} (8). Whereas (2-mesityl-1H-inden-3-yl)dicyclohexylphosphine (5) reacted with [(η6-cymene)RuCl2)]2 (in toluene) or RuCl3·3H2O (in ethanol) to afford {Ru[κ(P):(η6-2-mesityl-1H-inden-3-yl)PCy2]Cl2} (9). The molecular structures of complexes 6, 8 and 9 have been determined by single-crystal X-ray diffraction analysis. In addition, complexes 8 and 9 have been found to catalyze the acceptorless dehydrogenation of alcohols in toluene. 9 displayed high activity and different substrates, including cyclic and linear alcohols, were efficiently oxidized to ketones by using 2.0 mol% of catalyst.

Graphical abstract: Phenyl substituted indenylphosphine ruthenium complexes as catalysts for dehydrogenation of alcohols

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Publication details

The article was received on 01 Mar 2012, accepted on 22 Jun 2012 and first published on 22 Jun 2012


Article type: Paper
DOI: 10.1039/C2DT30499F
Citation: Dalton Trans., 2012,41, 10309-10316
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    Phenyl substituted indenylphosphine ruthenium complexes as catalysts for dehydrogenation of alcohols

    J. Yuan, Y. Sun, G. Yu, C. Zhao, N. She, S. Mao, P. Huang, Z. Han, J. Yin and S. Liu, Dalton Trans., 2012, 41, 10309
    DOI: 10.1039/C2DT30499F

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