Abstract
Aldol condensation is a very important reaction in forming new C = C bond, and is an attractive way to extend the carbon chain of a molecule. In this research, diethylammonium acetate was used as an acid–base bifunctional catalyst to facilitate the formation of methacrolein via cross aldol condensation between formaldehyde and propionaldehyde. A conversion of 99.9% of propionaldehyde with a 97.4% selectivity to methacrolein (MAL) was achieved. Isotopic tracing experiments were used to propose a possible reaction mechanism. To verify the reactive pathway, we used isotopically labelled substrates. In addition, we attempted to trap the relevant reaction intermediate by decreasing the reaction temperature.
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Acknowledgements
This work was supported by National Key Research and Development Program of China (2017YFA0206803), and National Natural Science Foundation of China (21676277). Thanks to Mayfair Kung and Harold H. Kung for repairing the paper.
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Yan, R., Lv, Z., Tang, H. et al. Mechanistic Insight into Methacrolein Formation from Formaldehyde and Propionaldehyde. Catal Lett 152, 799–805 (2022). https://doi.org/10.1007/s10562-021-03679-5
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DOI: https://doi.org/10.1007/s10562-021-03679-5