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- W3103123497 abstract "A number of acid-modified clays (halloysite, montmorillonite, illite) were studied as catalysts for isoprenol cyclization with isovaleraldehyde to tetrahydropyranols used in perfumery as a mixture of cis- and trans- isomers. The main attention was paid to properties of halloysite nanotubes after treating them with 5% HCl at temperatures from 30 to 100 °C. The catalysts were characterized by XRD, EDX, MAS NMR, SEM, and N2 adsorption-desorption methods. The acid modification of halloysite allows an efficient increase of its acidity and specific surface area, while preserving morphology of nanotubes. On relatively weakly acidic clays, the formation of the target product occurs through a hemiacetal as a precursor. On the contrary, over strongly acidic resin Amberlyst-15, the yield of tetrahydropyranol was significantly lower because of a direct formation of tetrahydropyranols and dehydration by-products. The yield of tetrahydropyranol in the presence of clays was 65–72 %, slightly increasing with an increase in their acidity. The selectivity towards the cis- isomer did not practically depend on the acid sites concentration in clays, decreasing slightly for the trans-isomer with decreasing acidity due to formation of the dehydration by-products. In general, acid-modified clays are promising catalysts for the preparation of tetrahydropyranols under mild conditions and in the absence of any solvent." @default.
- W3103123497 created "2020-11-23" @default.
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- W3103123497 date "2021-01-01" @default.
- W3103123497 modified "2023-09-25" @default.
- W3103123497 title "Solvent-free synthesis of tetrahydropyran alcohols over acid-modified clays" @default.
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- W3103123497 doi "https://doi.org/10.1016/j.mcat.2020.111306" @default.
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