Oxidation of cyclohexane by transition-metal complexes with biomimetic ligands

Silva, Ana Rosa; Mourão, Teresa; Rocha, João

doi:10.1016/j.cattod.2012.07.043

Cited by 55 publications

(23 citation statements)

References 25 publications

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“…Different mineral or organic acids gave lower conversions. [113] Electron-donating substituents in the para-position of the phenolringexerted abeneficial effect in cyclohexane oxidation (see Figure 3 and Table1). [113] ATON as high as 97 was achieved in the more challenging n-hexane oxidation, but low selectivity has been observed.…”

Section: Salen-basediron Catalystsmentioning

confidence: 98%

“…[113] Electron-donating substituents in the para-position of the phenolringexerted abeneficial effect in cyclohexane oxidation (see Figure 3 and Table1). [113] ATON as high as 97 was achieved in the more challenging n-hexane oxidation, but low selectivity has been observed. Ther elated neutral N 4 type iron complex [Fe(pyhd)(Cl 2 )] (see Figure 3) gave lower yields in cyclohexane oxidation (see Table 1), indicating the essential role playedb yt he two phenoxy moieties to stabilize the complex.…”

Section: Salen-basediron Catalystsmentioning

confidence: 98%

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Non‐Heme Imine‐Based Iron Complexes as Catalysts for Oxidative Processes

2016

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Non-heme iron complexes are emerging as powerful and versatile catalysts in several oxidative transformations. Them ost investigated iron complex structures are based on aminopyridine ligands,b ut an umber of imine-based ligands have been also tested. In this review ac ollection of recent results obtained in oxidation catalysisw ith non-heme iminebased iron complexes is presented. Theirc atalytic performances in C À H, C=Ca nd À S À oxidation are spread over aw ide range of efficiency,g oing from very low to quite high.S uch performances are discussed, whenever possible,i nl ight of the operating reactionm echanismsa nd of catalyst stability.I n order to facilitate the discussion,a ni nitial survey of the most useful mechanistic tools widelya pplied to distinguish am etal-based oxidation from ar adicalchain process is also reported. Imine-basedc atalysts are divided into twoc lasses:( i) salen-Fec omplexes, and (ii)i mine-Fe complexes.I ns ome cases clues for free-radical oxidation mechanisms have been reported whilei no ther casese vidence for metal-based mechanisms has been collected. Thep referredm echanisticp athway is shown to be af unction of catalyst structure and features

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Section: Salen-basediron Catalystsmentioning

confidence: 98%

Section: Salen-basediron Catalystsmentioning

confidence: 98%

Non‐Heme Imine‐Based Iron Complexes as Catalysts for Oxidative Processes

2016

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“…In the biomimetic catalysts the central ion is a redox-active transition metal ion while the ligands are amino acids or other molecules having groups that are able to coordinate to the central ion [6].…”

Section: Introductionmentioning

confidence: 99%

CuII(Sal-Ala)/CuAlLDH Hybrid as Novel Efficient Catalyst for Artificial Superoxide Dismutase (SOD) and Cyclohexene Oxidation by H2O2

et al. 2015

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This work presents Cu II (Sal-Ala) complex immobilized on the CuAlLDH as a novel efficient catalyst for artificial superoxide dismutase (SOD) enzyme activity and cyclohexene oxidation. The physico-chemical properties of Cu II (SalAla)/CuAlLDH were investigated by XRD, XPS, FTIR, DRUV and TGA techniques. The correlation between the catalytic performances, structure and composition of the hybrid catalyst is also discussed. Graphical Abstract& Mihaela Mureşeanu

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“…Their C-H bond(s) can be converted to C-OH or C@O functional groups, leading to the production of more valuable products for fine chemical synthesis [1][2][3][4][5], such as the cyclohexane (Cy) oxidation. The products of cyclohexanol (CyOH) and cyclohexanone (CyO) (the mixture is commonly known as the KA oil) are important intermediates for the synthesis of caprolactam and adipic acid [6]. Hence, searching efficient catalyst for such reactions becomes a hot topic since the high inertness of saturated hydrocarbons under mild conditions impedes their broad synthetic use [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%