Abstract
In this work, the protons of the Keggin heteropolyacids were exchanged by Lewis acid metal cations generating salts that were evaluated as catalysts on the β-pinene etherification with alkyl alcohols. The Fe(III) phosphotungstate salt (i.e. FePW12O40) was the most active and selective catalyst toward the formation of α-terpinyl methyl ether, the main reaction product. The activity of FePW12O40 catalyst was higher than their precursors of synthesis (i.e. H3PW12O40, Fe(NO3)3), other Fe(III) heteropoly salts (i.e. FePMo12O40 and Fe4/3SiW12O40), and heteropoly salts of different Lewis acids (i.e. AlPW12O40, Cu3(PW12O40)2). The effects of the main variables of reaction such as temperature, catalyst load, and alcohol nature were assessed. The Fe(III) cation, as well as the phosphotungstate anion, showed to be essential to the formation of the goal-product (α-terpinyl alkyl ether).
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The authors are grateful for the financial support from CNPq and FAPEMIG (Brasil). This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.
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da Silva, M.J., de Andrade Leles, L.C. & Teixeira, M.G. Lewis acid metal cations exchanged heteropoly salts as catalysts in β-pinene etherification. Reac Kinet Mech Cat 131, 875–887 (2020). https://doi.org/10.1007/s11144-020-01888-4
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DOI: https://doi.org/10.1007/s11144-020-01888-4