Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3227
Título: Synthesis and catalytic properties in olefin epoxidation of octahedral dichloridodioxidomolybdenum(VI) complexes bearing N,N-dialkylamide ligands: crystal structure of [Mo2O4(mu(2)-O)Cl-2(dmf)(4)]
Autor: Gago, Sandra
Neves, Patrícia
Monteiro, Bernardo
Pessêgo, Márcia
Lopes, André D.
Valente, Anabela A.
Almeida Paz, Filipe A.
Pillinger, Martyn
Moreira, José A.
Silva, Carlos M.
Gonçalves, Isabel S.
Palavras-chave: Molybdenum
O ligands
Homogeneous catalysis
Epoxidation
Kinetics
Data: 2009
Editora: Wiley-VCH Verlag
Citação: Gago, Sandra; Neves, Patrícia; Monteiro, Bernardo; Pessêgo, Márcia; Lopes, André D.; Valente, Anabela A.; Almeida Paz, Filipe A.; Pillinger, Martyn; Moreira, José A.; Silva, Carlos M.; Gonçalves, Isabel S.Synthesis and Catalytic Properties in Olefin Epoxidation of Octahedral Dichloridodioxidomolybdenum(VI) Complexes Bearing N,N-Dialkylamide Ligands: Crystal Structure of [Mo2O4(mu(2)-O)Cl-2(dmf)(4)], European Journal of Inorganic Chemistry, 2009, 29-30, 4528-4537, 2009.
Resumo: The catalytic performance of the complexes [MoO2Cl2(L)2][L = N,N-dimethylformamide (dmf), N,N-dimethylacetamide(dma), N,N-dimethylpropionamide (dmpa), N,N-diethylformamide(def) and N,N-diphenylformamide (dpf)] was examined in the epoxidation of cis-cyclooctene with tert-butyl hydroperoxide(tbhp) at 55 °C and in the absence of a cosolvent.The complexes showed high turnover frequencies in the range of 561–577 molmolMo–1h–1, giving the epoxide as the only product in 98% yield after 6 h. The reaction rates decreased significantly in consecutive runs carried out by recharging the reactors with olefin and oxidant. On the basis of the IR spectroscopic characterisation of the solids recovered at the end of the catalytic reactions, the decrease in activity is attributed to the formation of dioxido(μ-oxido)-molybdenum(VI) dimers. Accordingly, the treatment of [MoO2Cl2(dmf)2] with an excess amount of tbhp led to the isolation of [Mo2O4(μ2-O)Cl2(dmf)4], which was characterised by single-crystal X-ray diffraction and found to exhibit a catalytic performance very similar to that found in the second runs for the mononuclear complexes. The kinetics of the reaction of [MoO2Cl2(dmf)2] with tbhp was further examined by UV/Vis spectroscopy, allowing rate constants and activation parameters to be determined. For the dpf adduct, the effect of different solvents on cyclooctene epoxidation and the epoxidation of other olefins, namely, (R)-(+)-limonene, α-pinene and norbornene, were investigated
Peer review: yes
URI: http://hdl.handle.net/10400.1/3227
DOI: http://dx.doi.org/10.1002/ejic.200900544
ISSN: 1434-1948
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