2018
DOI: 10.3390/catal8100410
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Brønsted and Lewis Solid Acid Catalysts in the Valorization of Citronellal

Abstract: Terpenes are valuable starting materials for the synthesis of molecules that are of interest to the flavor, fragrance, and pharmaceutical industries. However, most processes involve the use of mineral acids or homogeneous Lewis acid catalysts. Here, we report results obtained in the liquid-phase reaction of citronellal with anilines under heterogeneous catalysis conditions to give tricyclic compounds with interesting pharmacological activity. The terpenic aldehyde could be converted into octahydroacridines wit… Show more

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Cited by 22 publications
(13 citation statements)
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References 26 publications
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“…The discrepancy between samples with low P content and P-rich samples is more pronounced at a high temperature, the kinetic constants values at 90 °C (k90) of NbO and NbO:NbP (3:1) samples being almost two orders lower than the other catalysts. No significant differences emerged in the computed activation parameters for the five catalysts (Ea around 100-140 kJ mol −1 and ln A around [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. In any case, the obtained values for the individual components, NbO and NbP, were in good agreement with those previously reported in the literature [17,48].…”
Section: Catalytic Activity 231 Catalytic Inulin Hydrolysissupporting
confidence: 88%
“…The discrepancy between samples with low P content and P-rich samples is more pronounced at a high temperature, the kinetic constants values at 90 °C (k90) of NbO and NbO:NbP (3:1) samples being almost two orders lower than the other catalysts. No significant differences emerged in the computed activation parameters for the five catalysts (Ea around 100-140 kJ mol −1 and ln A around [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. In any case, the obtained values for the individual components, NbO and NbP, were in good agreement with those previously reported in the literature [17,48].…”
Section: Catalytic Activity 231 Catalytic Inulin Hydrolysissupporting
confidence: 88%
“…The absorption spectrum at 150 • C of the raw Mt ANa shows the presence of both Bpy sites (bands at 1544 cm −1 ) and Lpy sites (band at 1447 cm −1 ), besides an intense band at around 1490 cm −1 (Bpy + Lpy + HPy sites). These values are in the spectral range observed for FTIR-Pyr adsorption in different types of Mt [21,22,37,40]. After desorption at 250 • C, the intensities of the three bands decreased, revealing the presence of moderate strength Bpy and LPy sites; at 350 • C no bands were detected, indicating the absence of strong sites.…”
Section: Montmorillonite's Brønsted and Lewis Acidity: Fourier Transfmentioning
confidence: 52%
“…The swelling process is important in order to increase the barrier distance between the outside char layer exposed to the flames and the inner polymeric matrix, slowing down the transference of heat and, therefore, the composite degradation kinetics. Many authors investigated the influence of the acidity of Mt on the catalysis of organic reactions [21,22,37,39,40,42]. Jha et al [21] prepared metal cation-exchanged Mt catalysts and observed the highest conversion of p-cresol to 2,2-methylenebis (4-methyl phenol) with the catalyst exhibiting the highest Brønsted acidity.…”
Section: % Bpy Sites =mentioning
confidence: 99%
“…The most common used solid acid catalysts include silica solid acids [9], biopolymer-based solid acids [10], ion-exchange resin solid acids [11], zirconia solid acids [12], and hydroxyapatite solid acids [13]. Nowadays, green catalysts, which are based on the use of renewable raw materials, are getting more and more attention [14].…”
Section: Introductionmentioning
confidence: 99%