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Exploring the Keggin-Type Heteropolyacid-Catalyzed Reaction Pathways of the β-Pinene with Alkyl Alcohols

  • Henrique Priori Polo
  • Neide Paloma Goncalves Lopes
  • Márcio José da SilvaEmail author
Article
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Abstract

In this work, we investigated the activity of Keggin heteropolyacid catalysts (i.e., H3PW12O40, H3PMo12O40 and H4SiW12O40) in β-pinene reactions with alkyl alcohols (i.e. methyl, ethyl, propyl, sec-propyl, butyl and sec-butyl alcohols), and exploring the different aspects that drive the selectivity of this process. We have found that carbon skeletal rearrangements and isomerization providing intermediate carbocations that controlling the reaction selectivity. β-pinene was preferentially converted to α-terpinyl ion which undergoes a nucleophilic attack of alcohol providing alkyl alcohol. Bornyl ion was converted to bornyl and fenchyl ethers. The other secondary products were β-pinene isomers obtained from bornyl and α-terpinyl carbocations. Phosphotungstic acid (i.e., H3PW12O40) was the most active catalyst and selective toward the main product (α-terpinyl alkyl ether); the highest conversion (ca. 96%) and ether selectivity (ca. 61%) was achieved in the reactions with β-pinene. Although having also been alkoxylate, α-pinene was less reactive (ca. 40%), while camphene and limonene remained unreactive under reaction conditions studied. An increase of temperature resulted in an improvement on conversion of β-pinene and selectivity toward α-terpinyl methyl ether. Similarly, the H3PW12O40 concentration played a crucial role on reaction selectivity. This work presents positive features such as a short reaction time, high atom economy, mild reaction conditions (i.e., low temperature and room pressure). Even though soluble the catalyst was easily recovered by liquid -liquid extraction and efficiently reused.

Graphical Abstract

Keywords

Keggin heteropolyacids Terpenic ethers β-pinene Catalytic alkoxylation 

Notes

Acknowledgements

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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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Henrique Priori Polo
    • 1
  • Neide Paloma Goncalves Lopes
    • 1
  • Márcio José da Silva
    • 1
    • 2
    Email author
  1. 1.Chemistry DepartmentFederal University of ViçosaViçosaBrazil
  2. 2.Departamento de Química, Universidade Federal de Viçosa (UFV)ViçosaBrazil

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