Vanadium complexes: Recent progress in oxidation catalysis

Sutradhar, Manas; Martins, Luísa M. D. R. S.; Silva, M. Fátima C. Guedes da; Pombeiro, Armando J. L.

doi:10.1016/j.ccr.2015.01.020

Cited by 235 publications

(98 citation statements)

References 140 publications

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“…As expected [7,9], the alicyclic cyclohexanol is less reactive than 1-phenylethanol: Table 3, entries 1-3). The linear aliphatic alcohols, 2-hexanol and 3-hexanol, lead to even lower yields in the 45-56 % range (Table 3, entries 4-9), under similar reaction conditions, as reported in other cases [2,3,6,7]. The activity of 1-3 in the oxidation of benzyl alcohol or 1-hexanol is quite modest since only rather moderated yields of benzaldehyde (30-34 % range) or hexanal (22-24 % range) are obtained under the same reaction conditions (Table 3, entries 10-12 and 13-15, respectively).…”

Section: Microwave-assisted Catalytic Peroxidativesupporting

confidence: 62%

“…The catalytic systems of the present study seem to operate under heterogeneous conditions and, although yielding ketone products in the range reported for homogeneous ones [2,3,6,7], e.g., the tris{2,4-bis(trichloromethyl)-1,3,5-triazapentadienato}-Fe(III) complexes/MW/TBHP systems [11], they are advantageous due to the possibility of recycle and reuse of the catalysts up to three consecutive catalytic cycles without a marked loss of activity (see below).…”

Section: Microwave-assisted Catalytic Peroxidativementioning

confidence: 83%

“…Many catalytic methods have been developed for the oxidation of alcohols, the most commonly utilizing homogeneous catalysts based on different transition metals, such as Co [3], Mn [4,5], V [6], Cu [7][8][9][10], Fe [11][12][13][14], Mo [14], Ru [16,17], and Pd [18]. Unfortunately, most of the Electronic supplementary material The online version of this article (doi:10.1007/s10562-015-1616-2) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, they suffer from the usual separation and recycling difficulties inherent to homogenous catalytic system. To eliminate the harmful wastes, the development of catalytic oxidation procedures that involve green oxidants, in particular dioxygen or peroxides [H 2 O 2 , tert-butylhydroperoxide ( t BuOOH or TBHP)], is a matter of current interest [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Solvent-Free Microwave-Assisted Peroxidative Oxidation of Alcohols Catalyzed by Iron(III)-TEMPO Catalytic Systems

et al. 2015

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The iron(III) complexes [H(EtOH)][FeCl 2 (L) 2 ](1), [H 2 bipy] 1/2 [FeCl 2 (L) 2 ].DMF (2) and [FeCl 2 (L)(2,2 0 -bipy)] (3) (L = 3-amino-2-pyrazinecarboxylate; H 2 bipy = doubly protonated 4,4 0 -bipyridine; 2,2 0 -bipy = 2,2 0 -bipyridine, DMF = dimethylformamide) have been synthesized and fully characterized by IR, elemental and single-crystal X-ray diffraction analyses, as well as by electrochemical methods. Complexes 1 and 2 have similar mononuclear structures containing different guest molecules (protonated ethanol for 1 and doubly protonated 4,4 0 -bipyridine for 2) in their lattices, whereas the complex 3 has one 3-amino-2-pyrazinecarboxylate and a 2,2 0 -bipyridine ligand. They show a high catalytic activity for the low power (10 W) solvent-free microwave assisted peroxidative oxidation of 1-phenylethanol, leading, in the presence of TEMPO, to quantitative yields of acetophenone [TOFs up to 8.1 9 10 3 h -1 , (3)] after 1 h. Moreover, the catalysts are of easy recovery and reused, at least for four consecutive cycles, maintaining 83 % of the initial activity and concomitant rather high selectivity. Graphical Abstract 3-Amino-2-pyrazinecarboxylic acid is used to synthesize three new iron(III) complexes which act as heterogeneous catalysts for the solvent-free microwave-assisted peroxidative oxidation of 1-phenylethanol.

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Section: Microwave-assisted Catalytic Peroxidativesupporting

confidence: 62%

Section: Microwave-assisted Catalytic Peroxidativementioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solvent-Free Microwave-Assisted Peroxidative Oxidation of Alcohols Catalyzed by Iron(III)-TEMPO Catalytic Systems

et al. 2015

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“…A complete overview of the present state of the research cannot be given here; the reader is referred to the literature. Some aspects are summed up in recent review papers [2,[4][5][6][7][8][9]. Catalysts involving vanadium oxides are usually based on V 2 O 5 , which contains vanadium in its highest oxidation state +5, but under reaction conditions the oxidation state may be lower.…”

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confidence: 99%

Carbon Dioxide Adsorption on V2O3(0001)

et al. 2017

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oxidation, selective reduction, and dehydrogenation of hydrocarbons and other organic compounds [1,2]. Examples are sulfuric acid production and the oxidation of butane to maleic anhydride [3]. The manifold of catalytic applications has triggered numerous fundamental research studies of vanadium oxides aiming to improve the microscopic understanding of the catalytic processes. A complete overview of the present state of the research cannot be given here; the reader is referred to the literature. Some aspects are summed up in recent review papers [2,[4][5][6][7][8][9]. Catalysts involving vanadium oxides are usually based on V 2 O 5 , which contains vanadium in its highest oxidation state +5, but under reaction conditions the oxidation state may be lower. Therefore the corundum type oxide V 2 O 3 has also been the topic of a number of studies (for an overview, see [2,9]). These studies benefited from the fact that V 2 O 3 layers with (0001) orientation can easily be grown on Au(111), Pd(111), Cu 3 Au(100) and W(110) [2,[9][10][11][12]. Adsorption studies have been performed for methanol [13,14], water [15,16], and O 2 [17]. The surface structure is a critical parameter for the reactivity of a material and therefore the structure of the V 2 O 3 (0001) surface has been investigated thoroughly. Guided mainly by the presence of an intense vanadyl induced feature in vibrational spectra [10,11] is was concluded that the surface should be terminated by a layer of vanadyl groups. This was questioned some years ago by studies which reported that the surface should be terminated by a quasi-hexagonal oxygen layer [18][19][20]. A later I/V-LEED (LEED = low energy electron diffraction; I/V-LEED = LEED intensity analysis) study could show that the initial picture of a vanadyl terminated surface is probably correct [21,22] and therefore we will use the term 'vanadyl terminated' throughout this text. The vanadyl terminated V 2 O 3 (0001) surface can be reduced by electron bombardment such that the oxygen atoms of the vanadyl Abstract The adsorption of carbon dioxide on epitaxially grown V 2 O 3 layers on Au(111) has been studied with thermal desorption and infrared absorption spectroscopy. It is shown that the as-grown grown oxide layer does not react with carbon dioxide; the molecule binds weakly to the surface, stays intact and desorbs below 200 K. If the oxide is weakly reduced such that part or all of the oxygen atoms of the surface vanadyl layer is removed, then a surface carboxylate, i.e. CO − 2 bound to surface vanadium is formed. Part of the CO 2 derived species decompose into O+CO upon annealing, with the oxygen atoms re-oxidizing the reduced oxide surface.

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