New Trendy Magnetic C-Scorpionate Iron Catalyst and Its Performance towards Cyclohexane Oxidation

Abstract

For the first time, a magnetic C-scorpionate catalyst was prepared from the iron(II) complex [FeCl 2 {κ 3 -HC(pz) 3 }] (pz = pyrazol-1-yl) and ferrite, using the sustainable mechanochemical synthetic procedure. Its catalytic activity for the cyclohexane oxidation with tert-butyl hydroperoxide (TBHP) was evaluated in different conditions, namely under microwave irradiation and under the effect of an external magnetic field. The use of such magnetic conditions significantly shifted the catalyst alcohol/ketone selectivity, thus revealing a promising, easy new protocol for tuning selectivity in important catalytic processes.

Ultrasound and Radiation-Induced Catalytic Oxidation of 1-Phenylethanol to Acetophenone with Iron-Containing Particulate Catalysts

“…The profiles of 3 and 4 are closer to Fe(II) species, as attested by the Fe(II) spectrum analyzed previously [23]. However, significant amounts of Cl (BE~198.7 eV) remain in samples, particularly in 3 with a Cl/Fe atomic ratio of 2.7, which is close to the nominal one in FeCl 3 .…”

“…It seems that a longer ball milling process promotes the graphitization of the carbon contaminations. Both Fe 2p regions of 1 and 2 look like that of Fe 3 O 4 analyzed previously [23], with Fe 2p 3/2 components being centered at 710.9 ± 0.2 eV. The overall quantification (Table 1) shows that almost no Cl, N, and S remain, which is compatible with the reaction of the iron precursors and consequent production of the iron oxide, mainly Fe 3 O 4 with some traces of the Fe(II) salt.…”

“…The use of such BE reference for samples 3 and 4 was not enough to shift Fe 2p regions to sound corrected positions; the main peak being around 712 eV, which is slightly larger than the reported BE for Fe 3+ [21]. In Figure 3, Fe 2p regions for samples 3 and 4 are plotted using a different charge correction, adopted to reach a compromise between the information taken from the quantification (Table 1), the qualitative analysis of spectra and previous results obtained for different iron species [23]. For these samples, the BE of the carbonaceous graphitized contamination was set to 284.4 eV, which seems to yield coherent results for all the other elements.…”

CeFe-Based Bead Nanocomposites as Catalysts for Oxidation of Ethylbenzene Reaction

“…Compared to the use of other oxides in catalytic oxidation reactions, the iron-based solids have various advantages including their importance for environmental chemistry, low cost, easy recovery and lower toxicity. In this regard, iron-based oxides are also very attractive from the perspective of replacing liquid catalysts in the selective oxidation of hydrocarbons [1][2][3][4][5][6].…”

“…Depending on the cyclic compounds used as substrate and the reaction conditions, the products obtained are benzaldehyde, acetophenone, styrene epoxide, benzoic acid, 2-phenyl-acetaldehyde, and other valuable compounds [1,[3][4][5]. These products find application in the synthesis of fine chemicals, resins, flavoring agent, plasticizers and agricultural compounds as well as intermediates for biochemical reaction pathways [6][7][8][9][10][11].…”