Towards highly efficient hydrotalcite/hydroxyapatite composites as novel catalysts involved in eco-synthesis of chromene derivatives

A Compendium of the Most Promising Synthesized Organic Compounds against Several Fusarium oxysporum Species: Synthesis, Antifungal Activity, and Perspectives

“…Recently, Velázquez-Herrera et al (2020) employed hydrotalcite/hydroxyapatite composites as catalysts for the synthesis of chromenes, showing higher conversions (up to 78% after 2 h), under solvent-free and mild conditions [ 79 ]. The authors suggested that both basicity and porosity are important factors controlling the catalytic behavior.…”

Continuous production of 1,4-pentanediol from ethyl levulinate and industrialized furfuryl alcohol over Cu-based catalysts

“…1, and all samples had similar FT-IR spectral absorption bands in the range of 4000-500 cm À1 . The wide and strong band at 3484 cm À1 as well as the small and sharp band near 1640 cm À1 in the FT-IR spectra are mainly attributed to the stretching vibration peak of hydroxyl (-O-H) and hydroxyl (H-O/H) in interlayer water molecules, 33,34 and the weak shoulder peak at 3030 cm À1 is mainly related to the hydrogen bond effect between interlayer water molecules and interlayer anions (mainly CO 3…”

Amino-grafted Cu and Sc Metal-Organic Frameworks involved in the green synthesis of 2-amino-4H-chromenes. Mechanistic understanding

“…Furthermore, assuming the interaction of DET with Cu centers in CuBTC through one of the terminal -NH 2 groups [40], which are sterically less hindered, the secondary amine functions comprising the central N, substituted with ethylene bridges, in DET should be responsible of the observed reactivity. It is important to note that although the primary and secondary amine functions are able to catalyze the reaction (Fig.…”

“…These features contribute to the production of wastes, such as solid residues and liquid efluents, highly polluting, and to increase the energy consumption. In this context, we have recently reported some new and environmental-friendly catalytic systems, useful in the multicomponent synthesis of 2-amino-4H-chromenes 1 (Scheme 1) comprising ionic liquids like imidazolium sulfonates [35], bifunctional mesoporous metallosilicates [36,37] and, much more recently, CaO-carbon materials, easily prepared from PET and natural limestone allowing the valorization of both PET residues and mineral sources, mesoporous hydrotalcite/SBA-15 and hydrotalcite/hydroxyapatite composites [38][39][40].…”