Título
Effect of structure and acidity of acid modified clay materials on synthesis of octahydro-2H-chromen-4-ol from vanillin and isopulegol
Autor(es)
Palabras clave
Montmorillonite
Kaolin
Metakaolin
Acid activation
Prins cyclization reaction
Octahydro-2H-chromen-4-ol
Clasificación UNESCO
Fecha de publicación
2015-09
Citación
Maria N. Timofeeva, Valentina N. Panchenko, Antonio Gil, Sergey V. Zakusin, Victoria V. Krupskaya, Konstantin P. Volcho, Miguel A. Vicente,
Effect of structure and acidity of acid modified clay materials on synthesis of octahydro-2H-chromen-4-ol from vanillin and isopulegol,
Catalysis Communications,
Volume 69,
2015,
Pages 234-238,
ISSN 1566-7367,
https://doi.org/10.1016/j.catcom.2015.07.005.
(https://www.sciencedirect.com/science/article/pii/S1566736715300157)
Resumen
The Prins cyclization of (−)-isopulegol with vanillin to form octahydro-2H-chromen-4-ol was studied in the presence of natural layered aluminosilicates modified by 0.5 mol/dm3 HCl, such as montmorillonite, kaolin, and metakaolin obtained by the calcination of kaolin at 650 °C. According to infrared spectroscopy using pyridine as probe molecule, the amount and strength of Brønsted acid sites depend on the type of clay and decrease in the following order HCl-montmorillonite > HCl-kaolin > HCl-metakaolin. The difference in Brønsted acidity and textural properties of clays affected the reaction rate and the selectivity towards octahydro-2H-chromen-4-ol
URI
ISSN
1566-7367
DOI
10.1016/j.catcom.2015.07.005
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