Molecular Oxygen Lignin Depolymerization: An Insight into the Stability of Phenolic Monomers

This is the peer reviewed version of the following article: Y. Mathieu, J. D. Vidal, L. Arribas Martínez, N. Abad Fernández, S. Iborra, A. Corma, ChemSusChem 2020, 13, 4743, which has been published in final form at https://doi.org/10.1002/cssc.202001295. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.[EN] During oxidative depolymn. of lignin in aq. alk. medium using mol. oxygen as oxidant, the highly functionalized primary phenolic monomers are not stable products, owing to various not fully identified secondary reaction mechanisms. However, better understanding of the mechanisms responsible for the instability of the main part of the products of interest derived from lignin is of much interest. Evaluation of their individual reactivities under oxidative conditions should significantly help to find a better way to valorize the lignin polymer and to maximize the yields of target value-added products. Consequently, the main objective of this study is to assess the individual stabilities of some selected ligninbased phenolic compds., such as vanillin, vanillic acid, and acetovanillone, together with some other pure chem. compds. such as phenol and anisole to give an insight into the mechanisms responsible for the simultaneous formation and repolymn. of those products and the influence of the oxidn. conditions. Various complementary strategies of stabilization are proposed, discussed, and applied for the oxidative depolymn. reactions of a tech. lignin extd. from pinewood with a high content of b-O-4 interconnecting bonds to try to obtain enhanced yields of value-added products.The authors thank Tecnicas Reunidas for material and financial support. We also acknowledge the Spanish Ministry of Science, Innovation, and Universities for funding through the "Severo Ochoa" Excellence Program (SEV 2016-0683) and the LIGNO-PRIZED project from the Spanish Centre for the Development of Industrial Technology (CDTI) in the framework of the Strategic Program of National Business Research Consortia (CIEN-2016). Special and kindly thanks are also given to Dr. Dalgi Sunith Barbosa Trillos and Dr. Jakob Mottweiler for their priceless help during the elaboration of the present work.Mathieu, Y.; Vidal, JD.; Arribas Martínez, L.; Abad Fernández, N.; Iborra Chornet, S.; Corma Canós, A. (2020). Molecular Oxygen Lignin Depolymerization: An Insight into the Stability of Phenolic Monomers. ChemSusChem. 13(17):4743-4758. https://doi.org/10.1002/cssc.202001295474347581317BP. energy outlook2019 https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/energy-outlook/bp-energy-outlook-2019.pdf.J. Bluestein J. 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