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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Main processes for chemical production of vanillin. (a) synthetic method to produce vanillin from eugenol by eugenol isomerization in isoeugenol and its oxidation; (b) vanillin production by Riedel process on guaiacol; (c) vanillin synthesis by guaiacol Solvay’s route.