Ozonation Reactions of Monomer and Dimer Lignin Models: Influence of a Catalytic Amount of a Manganese Cyclam Derivative on the Ozonation Reaction

Létumier, F.; Barbe, Jean‐Michel; Trichet, A.; Guilard, Roger

doi:10.1080/01919519908547259

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…The OH radicals formed during decomposition of ozone (which we confirmed by testing using isopropyl alcohol and the kinetic method, k 1 ¹ k 1/2 ) are strong oxidizing agents and readily break down the organic moiety of the complex [16,17]. Impregnated Cu(II) complexes decrease their activity during reaction due to adsorption of water vapor from the ozone-air mixture and so are readily regenerated on drying (T = 110°C) to constant weight.…”

Section: Resultsmentioning

confidence: 79%

Effect of the structure of copper(II) complexes, adsorbed on the surface of SiO2, on their catalytic activity in ozone decomposition

et al. 2006

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We describe the composition, structure, and catalytic activity in the reaction of ozone decomposition for copper(II) complexes with acido ligands and immobilized Schiff's bases (propyl benzaldimine derivatives) that are anchored on silica (silica gel, aerosil). We demonstrate methods for controlling their catalytic activity.Anchoring metal complexes on the surface of various supports by even very simple methods (impregnation, ion-exchange adsorption) leads to significant changes in their reactivity and catalytic capacity. An example of this is data on the catalytic activity of Pd(II) -Cu(II) complexes anchored on oxide supports and natural zeolite in low-temperature oxidation of CO by oxygen [1, 2] and Cu(II) complexes in oxidation of phosphine [3]. Such complexes have demonstrated higher catalytic activity and stability compared with their liquid-phase analogs. A substantial change in catalytic properties in ozone decomposition has been exhibited by chloride complexes of copper(II) anchored on SiO 2 by the impregnation method [4], and also by copper(II) complexes with Schiff's bases immobilized on aerosil (propyl salicylaldimine, 5-bromo propyl salicylaldimine, and 2-hydroxynaphthalene propyl aldimine) [5,6]. In contrast to the previous examples, the indicated copper(II) complexes do not catalyze decomposition of ozone in the liquid phase [7], so information about the effect of the anchoring method, the composition, and the structure of copper(II) complexes on the ozone decomposition kinetics is needed to predict their catalytic activity in redox reactions.The aim of this work was to establish a connection between the composition and the structure of copper(II) complexes with acido ligands and Schiff's bases (propyl benzaldimine derivatives) that are anchored on silica and their catalytic activity in low-temperature ozone decomposition.In continuing the work in [4-6], we needed to study the kinetics of ozone decomposition by impregnated CuX 2 /SiO 2 complexes (X = Cl -, NO 3 − ), copper(II) complexes with 2-hydroxy-3-methoxy propyl benzaldimine and 4-hydroxy-3-methoxy propyl benzaldimine immobilized on aerosil, and also to compare the data obtained with previously published data.60 0040-5760/06/4201-0060

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Section: Resultsmentioning

confidence: 79%

Effect of the structure of copper(II) complexes, adsorbed on the surface of SiO2, on their catalytic activity in ozone decomposition

et al. 2006

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Efficient Synthesis of Multifunctional Chelating Agents Based on Tetraazacycloalkanes

et al. 2018

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An efficient route has been developed for the synthesis of multifunctional tetraazacycloalkanes (in particular 1,4,7,10‐tetraazacyclotridecane) incorporating an aminomethyl pendant arm on the carbon skeleton. Starting from the appropriate C‐functionalized bisaminal‐protected intermediate, the target macrocycles were easily obtained by means of a step‐by‐step introduction of the desired functional groups onto the free primary amine group, followed by deprotection of the bisaminal intermediates. This straightforward and versatile synthetic approach paves the way for the design of a new family of multifunctional chelators.

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Lignin Structure, Properties, and Applications

Hatakeyama

2009

Advances in Polymer Science

215

164

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Ozonation Reactions of Monomer and Dimer Lignin Models: Influence of a Catalytic Amount of a Manganese Cyclam Derivative on the Ozonation Reaction

Cited by 5 publications

References 7 publications

Effect of the structure of copper(II) complexes, adsorbed on the surface of SiO2, on their catalytic activity in ozone decomposition

Effect of the structure of copper(II) complexes, adsorbed on the surface of SiO2, on their catalytic activity in ozone decomposition

Efficient Synthesis of Multifunctional Chelating Agents Based on Tetraazacycloalkanes

Lignin Structure, Properties, and Applications

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