Clay-supported non-chiral and chiral Mn(salen) complexes as catalysts for olefin epoxidation

Fraile, José M.; García, Joaquín; Massam, Jarrod; Mayoral, José A.

doi:10.1016/s1381-1169(98)00013-2

Cited by 102 publications

(43 citation statements)

References 32 publications

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“…This has also been reported by other authors for similar supported catalysts. [44,45] Elemental analysis confirms that both methodologies used for complex encapsulation lead to similar manganese loading but different complex loading.…”

Section: Catalytic Studiesmentioning

confidence: 64%

“…In contrast, the bands typical of the zeolite structure do not show significant changes after the catalytic reaction. These observations suggest that no structural changes to the NaY structure took place during consecutive catalytic cycles, but some metal complex decomposition, probably by partial oxidation, [44] must occur due to the experimental conditions applied. Furthermore, a new band at 877 cm À1 appears in the FT-IR spectrum of the recovered Mnsalen@Y B catalyst, indicating the presence of occluded epoxide species which have not been removed during the washing process.…”

Section: Catalytic Studiesmentioning

confidence: 86%

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Encapsulation of manganese(III) complex in NaY nanoporosity for heterogeneous catalysis

Kuźniarska‐Biernacka

Rodrigues

Carvalho

et al. 2011

Applied Organom Chemis

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An encapsulated Mn(III)-salen complex in NaY was synthesized and characterized, and the catalytic behaviour of the complex was evaluated by the oxidation of styrene. The encapsulation was achieved by two different methodologies designated as the flexible ligand method (A) and the method of in situ complex synthesis (B). The characterizations of the free complex as well as the catalysts with and without the complex were performed by powder X-ray diffraction, scanning electron microscopy, chemical analysis and FT-IR spectroscopy. Both prepared catalysts are active in the oxidation of styrene in the presence of tert-butyl hydroperoxide (tBuOOH) and lead to styrene epoxide and benzaldehyde. The localization of the complex in zeolite plays an important role in the catalytic activity of these heterogeneous catalysts.

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Section: Catalytic Studiesmentioning

confidence: 64%

Section: Catalytic Studiesmentioning

confidence: 86%

Encapsulation of manganese(III) complex in NaY nanoporosity for heterogeneous catalysis

Kuźniarska‐Biernacka

Rodrigues

Carvalho

et al. 2011

Applied Organom Chemis

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“…[21] In fact, heterogenization is currently an important area of research in organometallics, and so heterogeneous catalysts can be produced. [22] Complexes of metals such as chromium, [23] cobalt, [24] copper, [24,25] iron, [24a, 26] manganese, [21, 24b, 26a, 27] molybdenum, [27f, 28] nickel, [27a, 29] rhodium, [30] ruthenium, [31] palladium, [29d, 32] or platinum [33] have already been successfully heterogenized.…”

Section: Heterogenizationmentioning

confidence: 99%

The Best of Two Worlds from the Gold Catalysis Universe: Making Homogeneous Heterogeneous

Almeida

Carabineiro

2011

ChemCatChem

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Heterogeneous catalysts have well‐known advantages in the gas or liquid phase, which include facile separation, possibility of recycling, and potential application to continuous flow processes. Homogeneous catalysts have remarkable properties such as high activity, enantioselectivity, and well‐characterized structures. Heterogenization of metal complexes, through anchoring of inorganic/organometallic complexes on porous solid materials, is a way to combine the outstanding properties of both systems. This procedure has already been used with complexes of several metals such as chromium, cobalt, copper, manganese, molybdenum, nickel, or palladium, but heterogenization of gold complexes is still rare. Heterogeneous and homogeneous catalyses by gold have already established on their own, and the heterogenization of gold complexes is a very exciting and promising interface area of chemistry. This work reviews the attempts made so far by several authors on this important topic. The results obtained show that these hybrid materials can have improved activity and selectivity and are potential choice candidates for several catalytic processes.

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“…They have been entrapped in porous hosts (zeolites) via the "ship in a bottle" approach, [20][21][22][23] covalently linked to a support, [24][25][26] or inserted into porous or lamellar compounds via electrostatic interactions. [27][28][29] In the case of cationic matrixes such as layered double hydroxides (LDHs), in which the insertion proceeds via an anionic exchange, or in order to build metal organic frameworks (MOFs), it is necessary to functionalize the salen ligands by anchoring groups (carboxylates [30][31][32] or sulfonates [33,34] ). In particular, trivalent metal salen complexes bearing sulfonato groups (with M = Mn 3+ , Fe 3+ and Co 3+ ) were inserted into LDHs.…”

Section: Introductionmentioning

confidence: 99%

From Salicylaldehyde to Chiral Salen Sulfonates – Syntheses, Structures and Properties of New Transition Metal Complexes Derived from Sulfonato Salen Ligands

et al. 2010

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Coordination complexes derived from chiral and nonchiral sulfonato salen ligands {(SalenSO3)Na2: N,N′‐bis(5‐sulfonatosalicylidene)‐1,2‐diaminoethane disodium salt, [(R,R) and (S,S)‐CySalenSO3]NaK: (R,R) and (S,S)‐N,N′‐bis(5‐sulfonatosalicylidene)‐1,2‐diaminocyclohexane sodium–potassium salt} have been synthesized. The crystal structures of the chiral and nonchiral NiII complexes [Ni(SalenSO3)]Na2 (1) and [Ni((R,R)CySalenSO3)]NaK (2) were solved. The other chiral and nonchiral sulfonato salen complexes, [Cu(SalenSO3)]Na2 (4), [Cu((R,R)CySalenSO3)]NaK (5), [Cu((S,S)CySalenSO3)]NaK (6) and [Zn(SalenSO3)]Na2 (7) got hydrolyzed before suitable crystals could form. Yet, their hydrolysis led to the formation of single crystals of the residues of total or partial hydrolysis: 5‐sulfonatosalicylaldehyde sodium salt (A), N‐(5‐sulfonatosalicylidene)‐1,2‐diaminoethane copper(II) [Cu(SalSO3)] (8) and (R,R)‐N‐(5‐sulfonatosalicylidene)‐1,2‐diaminocyclohexane copper(II) {Cu[(R,R)CySalSO3]} (9). All compounds were studied with IR and UV/Vis spectroscopy; chiral compounds were also investigated by circular dichroism. The magnetic properties of the copper compounds were investigated. Whereas 8 shows intermolecular antiferromagnetic interactions between mononuclear CuII complexes, 7 presents a weak intramolecular ferromagnetic coupling (J = 0.66 cm–1, H = –JŜCu1ŜCu2), which has been rationalized by DFT calculations.

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Clay-supported non-chiral and chiral Mn(salen) complexes as catalysts for olefin epoxidation

Cited by 102 publications

References 32 publications

Encapsulation of manganese(III) complex in NaY nanoporosity for heterogeneous catalysis

Encapsulation of manganese(III) complex in NaY nanoporosity for heterogeneous catalysis

The Best of Two Worlds from the Gold Catalysis Universe: Making Homogeneous Heterogeneous

From Salicylaldehyde to Chiral Salen Sulfonates – Syntheses, Structures and Properties of New Transition Metal Complexes Derived from Sulfonato Salen Ligands

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