Biomimetic Catalysts for Oxidation of Veratryl Alcohol, a Lignin Model Compound
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Título: | Biomimetic Catalysts for Oxidation of Veratryl Alcohol, a Lignin Model Compound |
Autor/a: | González Riopedre, Gustavo Fernández García, María Isabel Gómez Fórneas, Esther Maneiro Maneiro, Marcelino |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Química Inorgánica |
Palabras chave: | Manganese | Peroxidases | Lignin | Schiff bases | Veratryl alcohol | |
Data: | 2013 |
Editor: | MDPI |
Cita bibliográfica: | González-Riopedre, G.; Fernández-García, M.I.; Gómez-Fórneas, E.; Maneiro, M. Biomimetic Catalysts for Oxidation of Veratryl Alcohol, a Lignin Model Compound. Catalysts 2013, 3, 232-246 |
Resumo: | Kraft pulp has to be bleached to eliminate the chromophoric structures, which cause a darkening of the pulp. In Nature, an equivalent role is assumed by ligninolytic enzymes such as lignin peroxidases, manganese peroxidases and laccases. The development of low molecular weight manganese peroxidase mimics may achieve environmentally-safe bleaching catalysts for the industry. Herein we report the synthesis and characterization of six manganese(III) complexes 1–6, incorporating dianionic hexadentate Schiff base ligands (H2L1-H2L4) and different anions. Complex 4, Mn2L22(H2O)2(DCA)2 was crystallographically characterized. Complexes 1–4 behave as more efficient mimics of peroxidase in contrast to 5–6. We have studied the use of these complexes as catalysts for the degradation of the lignin model compound veratryl alcohol. The biomimetic catalysts were used in conjunction with chlorine-free inexpensive co-oxidants as dioxygen or hydrogen peroxide. Yields up to 30% of veratryl alcohol conversion to veratraldehyde have been achieved at room temperature in presence of air flow using 0.5% of catalyst |
Versión do editor: | https://doi.org/10.3390/catal3010232 |
URI: | http://hdl.handle.net/10347/22988 |
DOI: | 10.3390/catal3010232 |
E-ISSN: | 2073-4344 |
Dereitos: | © 2013 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/) |
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