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Dioxomolybdenum(VI) complexes with acylpyrazolonate ligands: Synthesis, structures, and catalytic properties

AuthorsHills, L.; Moyano, Raquel; Montilla, Francisco; Pastor, Antonio; Galindo, Agustín; Álvarez, Eleuterio ; Marchetti, F.; Pettinari, Claudio
Issue Date2013
PublisherJohn Wiley & Sons
CitationEuropean Journal of Inorganic Chemistry: 3352- 3361 (2013)
AbstractThe complexes [Mo(O)2(QR)2] [R = cyclohexyl (1), ethylcyclopentyl (2), hexyl (3), and neopentyl (4)] have been obtained in good yields by treatment of [Mo(O)2(acac)2] with 2 equivalents of acylpyrazolone compounds HQR [HQR = 3-methyl-1-phenyl-4-alkylcarbonyl-5-pyrazolone; R = cyclohexyl (HQ Cy), ethylcyclopentyl (HQEtCp), hexyl (HQHe), neopentyl (HQnPe)]. They were isolated as yellow crystalline solids and characterized spectroscopically [IR, 1H and 13C( 1H) NMR] and structurally (X-ray for 2 and 3). The deoxygenation of selected epoxide substrates to alkenes by employing compounds 1 and 3 as catalysts and PPh3 as the oxygen acceptor showed good activities in toluene. The use of the ionic liquid [C4mim]PF6 as solvent gave lower yields, but the resulting catalytic system could be conveniently recycled. The [Mo(O)2(QR)2] derivatives 1 and 3 were also found to be moderately active catalysts for the deoxydehydration of vicinal diols. Dioxomolybdenum(VI) complexes with acylpyrazolonate ligands have been synthesized, characterized, and tested as catalysts in the deoxygenation of styrene oxide with triphenylphosphane as the oxygen acceptor. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Identifiersdoi: 10.1002/ejic.201300098
issn: 1434-1948
Appears in Collections:(IIQ) Artículos
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