Abstract
In this work, inexpensive and simple commercial transition metal salts were evaluated as catalysts in the acetalization of alkyl alcohols with β-citronellal, a renewable origin substrate. After an initial screening, FeCl3 was the most active and selective catalyst among the various transition metal salts evaluated toward the β-citronellal methyl acetal. The impacts of main reaction parameters such as time, temperature, catalyst load, and type of alcohol on conversion and selectivity of the reactions were investigated. Different iron salts were also investigated. It was demonstrated that both oxidation number and type of anion present in the salt play an essential role in this reaction. Notably, the dissolution of catalyst salts in solution triggered a decrease in the pH of the medium due to the hydrolysis (and or solvolysis) of the metal cation, impacting the conversion and reaction selectivity. The highest activity of FeCl3 was assigned to the greatest Lewis acidity strength, as demonstrated by the acidity measurements. This inexpensive, low-corrosive, and commercially affordable catalyst has advantages over traditional liquid mineral acid catalysts and provides an alternative route to synthesize alkyl terpene acetals.
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Acknowledgements
The authors are grateful for the financial support from CNPq and FAPEMIG (Brazil). 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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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior,001,Marcio Silva
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Venâncio, A.N., Ribeiro, C.J.A., Júlio, A.A. et al. Assessments on the transition metal salt-catalyzed β-citronellal condensation reactions with alkyl alcohols. Reac Kinet Mech Cat 137, 149–161 (2024). https://doi.org/10.1007/s11144-023-02528-3
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DOI: https://doi.org/10.1007/s11144-023-02528-3