The oxidation of 2,6-xylenol catalysed by polymer supported copper complexes
TL;DR: In this article, the synthesis and characterisation of copolymers containing tertiary nitrogen to which Cu(I) or Cu(II) species are anchored is described, and the anchored species function as catalysts for the oxidation of 2,6-xylenol by O 2 under basic conditions.
About: This article is published in Polymer.The article was published on 1998-01-01. It has received 7 citations till now. The article focuses on the topics: 2,6-Xylenol & Catalyst support.
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TL;DR: In this paper, a macroporous poly glycidyl methacrylate-co- ethylene glycol dimethacrylated (poly(GMA-co)-EGDMA)) adsorbent was synthesized by radical suspension copolymerization, and the amine and thiourea functional groups enabled the effective removal of Cr(VI).
Abstract: To remove Cr(VI) from aqueous solution, a macroporous poly glycidyl methacrylate-co- ethylene glycol dimethacrylate (poly(GMA-co-EGDMA)) adsorbent was synthesized by radical suspension copolymerization. Allylamine was used to open the epoxy ring of the prepared copolymer, then the radical polymerization of the grafted allylamine was performed, and as the last step, methyl isothiocyanate (MITC) was reacted with the crosslinked graft copolymers to introduce the thiourea groups. The introduced amine and thiourea functional groups enabled the effective removal of Cr(VI). The polymer was analyzed by FT-IR spectroscopy, FE-SEM, and mercury porosimetry, and the chemical structure, surface morphology and pore characteristics of the polymer were confirmed. The pH of the Cr(VI) solution strongly affected the performance of the adsorbent, and the best removal efficiency was obtained at pH 2. In the kinetic studies, the qe value determined from the pseudo-second-order model was similar to the experimental qe value, and this model showed the best correlation. The isotherm data were better fit by the Langmuir adsorption isotherm model than the Freundlich isotherm model, and the maximum adsorption capacity was 166.24 mg/g.
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TL;DR: In this paper, two terpolymers of styrene, divinylbenzene, and 1-vinylimidazole (S/DVB/VI) were used as the catalysts supports.
Abstract: The hydrosilylation of cyclohexanone and acetone with triethysilane and diphenysilane catalyzed by polymer-supported Rh(I) complex has been investigated. Two terpolymers of styrene, divinylbenzene, and 1-vinylimidazole (S/DVB/VI) or N-vinylpyrrolidinone (S/DVB/NVP) were used as the catalysts supports. Physical characterization of these materials has involved the measurements of the structural parameters in the dry and swollen states by DSC, the nitrogen BET adsorption method and inverse steric exclusion chromatography ISEC. From these results it can be concluded that the original polymer structure has been changed during the complex attachment giving rise to materials of higher porosity. X-ray photoelectron spectroscopy XPS, IR, and AAS spectroscopy were used to characterization of heterogeneous complexes before and after use. The effect of the morphology of the support on the catalytic properties of the polymer-supported Rh(I) species was tested in the hydrosilylation of ketones and correlated with the reaction mechanism. It was demonstrated that the high selectivity of homogeneous rhodium complex toward the silyl ethers can be partially reversed to the dehydrogenative silylation products by a proper choice of polymer support with favorable microporous structure. Recycling tests demonstrated high stability of the supported catalysts during prolonged use. The constant selectivity of the supported catalysts demonstrated during recycling experiments showed that they could be useful for practical application. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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TL;DR: In this article, it was shown that the superoxide radical is generated in a large number of reactions of biochemical importance, in both enzymatic and nonenzymatic oxidations.
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