Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1294
Título: Novel Scorpionate and Pyrazole Dioxovanadium Complexes, Catalysts for Carboxylation and Peroxidative Oxidation of Alkanes
Autor: Silva, Telma F. S.
Luzyanin, Konstantin V.
Kirillova, Marina V.
Silva, M. Fátima Guedes da
Martins, Luísa Margarida D. R. S.
Pombeiro, Armando J. L.
Palavras-chave: Alkanes
Carboxylation
C-H Bond Activation
Oxovanadium Complexes
Peroxidative Oxidation
Scorpionate Ligands
Vanade-Dependent Haloperoxidades
Copper Trethanolamine Complexes
Ono Donor Ligands
Acetic-Acid
Coordination Chemistry
Vanadium Complexes
Vanadium Complexes
Higly Efficient
Spectroscopic Characterization
Mild Conditions
Data: Jan-2010
Editora: Wiley-V C H Verlag GMBH
Citação: Silva T F S, Luzyanin K V, Kirilova M V, Silva M F G, Martins L M D R S, Pombeiro A J L. Novel Scorpionate and Pyrazole Dioxovanadium Complexes, Catalysts for Carboxylation and Peroxidative Oxidation of Alkanes.Advanced Synthesis & Catalysis. 2010; 352 (1): 171-187.
Relatório da Série N.º: 1;
Resumo: The dioxovanadium(V) complexes [VO2(3,5-Me(2)Hpz)(3)][BF4] (1) (pz = pyrazolyl), [VO2{SO3C(pz)(3)}] (2), [VO2{HB(3,5-Me(2)pz)(3)}] (3) and [VO2{HC(pz)(3)}][BF4] (4), bearing pyrazole or scorpionate ligands, were obtained by reaction of triethyl vanadate [VO(OEt)(3)] with hydrotris(3,5-dimethyl-1-pyrazolyl)methane [HC(3,5-Me(2)pz)(3)] or 3,5-dimethylpyrazole (3,5-Me(2)Hpz; 1), lithium tris(1-pyrazolyl)methanesulfonate {Li[SO3C(pz)(3)], 2}, potassium hydrotris(3,5-dimethyl-1-pyrazolyl)borate {K[HB(3,5-Me(2)pz)(3)], 3} and hydrotris(1-pyrazolyl)methane [HC(pz)(3), 4], respectively. Treatment of [VO(OEt)(3)] with potassium hydrotris(1-pyrazolyl)borate {K[HB(pz)(3)]} led to the mixed eta(3)-tris(pyrazolyl)borate and eta(2)-bis(pyrazolyl)borate oxovanadium(IV) complex [VO{HB(pz)(3)}{H2B(pz)(2)}, 5]. The compounds were characterized by elemental analyses, IR, NMR and EPR spectroscopy, FAB and ESI mass spectrometry, cyclic voltammetry and, for 5, also by single crystal X-ray diffraction analysis. All complexes exhibit catalytic activity in the single-pot carboxylation [in trifluoroacetic acid/potassium peroxodisulfate (CF3COOH/K2S2O8)] of gaseous alkanes (methane and ethane) to carboxylic acids (yields up to 40%. TONs up to 157) and in the peroxidative oxidation [in water/acetonitrile (H2O/NCMe)] of liquid alkanes (cyclohexane and cyclopentane) to the corresponding alcohols and ketones (yields up to 24%, TONs up to 117), under mild conditions.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1294
ISSN: 1615-4150
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos



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