Journal
POLYCYCLIC AROMATIC COMPOUNDS
Volume 41, Issue 3, Pages 455-466Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10406638.2019.1596135
Keywords
Lanthanum manganite; heteropoly acid; nanocatalyst; solvent-free conditions; tetrahydrobenzo[b]pyran
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The new recyclable nanocatalyst synthesized for the condensation reaction to prepare tetrahydrobenzo[b]pyrans under solvent-free conditions was found to be efficient. It was clarified that supported heteropoly acid is the active site for the catalytic reaction, and various physicochemical methods were used to characterize the hybrid nanomaterial. The nanocatalyst showed good reusability and was the most efficient among previously reported catalysts in terms of reaction time, yield and ease of separation.
A new recyclable nanocatalyst consisting of heteropoly acid grafted on ionic liquid modified LaMnO3 nanoparticles was synthesized and accomplished as an efficient catalyst in condensation reaction for the preparation of tetrahydrobenzo[b]pyrans under solvent-free conditions. In addition, it was clarified that supported heteropoly acid (HPA) is the active site for the catalytic reaction, whereas the LaMnO3, ionic liquid functionalized lanthanum manganite nanoparticles are inactive. Different physicochemical methods such as Fourier transform infrared (FT-IR), X-ray powder diffraction (XRD), and field emission scanning electron microscopy (FESEM) were used to characterize the hybrid nanomaterial. The nanocatalyst reusability was affirmed by the use of five consecutive runs. Compared with the various previously reported catalyst, the new synthesized catalyst was found to be the most efficient with regard to reaction time, yield and ease of catalyst separation.
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