Pentacoordinated manganese(III) dihydrosalen complexes as biomimetic oxidation catalysts

Berkessel, Albrecht; Frauenkron, Matthias; Schwenkreis, Thomas; Steinmetz, Adrian; Baum, Gerhard; Fenske, Dieter

doi:10.1016/s1381-1169(96)00116-1

Cited by 63 publications

(27 citation statements)

References 29 publications

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“…However, in peroxide-containing solutions, all complexes are oxidatively unstable, as is, in fact, the case for many homogeneous oxidation catalysts (18)(19)(20)(21). As an illustration, we show in Figure 5 the time-dependent UV/vis spectra of 20 µM catalyst 2 with 8.6 mM H 2 O 2 and 100 µM Dequest in borax buffer, measured at 40°C over a period of half an hour.…”

Section: Resultsmentioning

confidence: 90%

Kinetic aspects of dye‐transfer inhibition by catalytic oxidation

Hazenkamp¹,

Bachmann²,

Dannacher³

et al. 2001

J Surfact & Detergents

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Dye-transfer inhibition (DTI) during laundering can be achieved by catalytic bleaching of the migrating dyes in the wash-liquor. The rate of the bleaching reaction should be significantly higher than the rate of dye adsorption onto the acceptor fabric. Further, the stability of the catalyst should be high enough in order to bleach dye which is slowly released from colored fabrics during the entire wash-cycle. The performance of three manganese-salen (Mn-salen) complexes as DTI catalysts is discussed in terms of their activity and their stability. It is shown that a very high activity is compatible with a high stability, leading to excellent DTI effects. For less stable catalysts, the performance can be markedly improved by optimizing the catalyst and peroxide concentrations or by formulation in a polymer matrix.Paper no. S1206 in JSD 4, 65-72 (January 2001).

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Section: Resultsmentioning

confidence: 90%

Kinetic aspects of dye‐transfer inhibition by catalytic oxidation

Hazenkamp¹,

Bachmann²,

Dannacher³

et al. 2001

J Surfact & Detergents

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“…The typical oxidant used in Mn-salen asymmetric epoxidations is NaOCl. However, more recent work by the groups of Berkessel and Katsuki have opened up ways for hydrogen peroxide to be employed [42,43]. Berkessel found that imidazole additives were crucial for the formation of the active oxo-manganese intermediates, and a manganese catalyst (9) based on a salen ligand incorporating a pendant imidazole was used for the asymmetric epoxidation using aqueous H 2 O 2 .…”

Section: Manganese-catalyzed Epoxidationsmentioning

confidence: 99%

Transition Metal‐Catalyzed Epoxidation of Alkenes

Adolfsson

2010

Modern Oxidation Methods

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“…The oxochromium(V) cation could be activated by the axial ligation of His93 to the Cr atom in the hydrophobic cavity. Mn(Schiff base) complexes also require donor ligands such as imidazole to stabilize the highly reactive Mn V @O (salen) species formed by the addition of H 2 O 2 and to accelerate the rate of oxidation [34]. These results indicate that the imidazole ligation (His93) to the Cr and Mn atoms efficiently activates the M V @O bond in the active site although a large excess of the donor ligands is required in the salen-catalyzed oxidation in organic solvents [20,21].…”

Section: Reactivity Of Schiff Base Complexes In Apo-mb Cavitymentioning

confidence: 99%