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ClO4−/Zr-MCM-41 nanoparticles prepared at mild conditions: a novel solid acid catalyst for the synthesis of polyhydroquinolines

Research paper by Mohammad Abdollahi-Alibeik, Sahar Saadat Hoseinikhah

Indexed on: 04 Apr '16Published on: 04 Apr '16Published in: Journal of the Iranian Chemical Society



Abstract

One-pot four-component reaction of aldehydes, dimedone, ethyl cyanoacetate or ethyl acetoacetate and ammonium acetate was studied in the presence of perchlorated Zr-MCM-41 (ClO4−/Zr-MCM-41) nanoparticles for the synthesis of dihydropyridines. Zr-MCM-41 nanoparticles with various molar ratios of Si/Zr were synthesized by sol–gel method under mild conditions, and then ClO4−/Zr-MCM-41 samples with different calcination temperatures were prepared and characterized by XRD, FT-IR and SEM techniques. The characterization results show the presence of perchlorate in the mesostructure of Zr-MCM-41 and the catalytic performance experiments show that ClO4−/Zr-MCM-41 with Si/Zr molar ratio of 25 and calcinations temperature of 300 °C has the best catalytic activity. The catalyst can be recovered easily and reused many times with moderate decrease in activity.