In this research, we reported Fe3O4@SiO2@NCs@Al2O3 [FSNCA] nanoparticles as an efficient catalyst for the synthesis of Tetrahydrobenzopyrans (THBPS) in water solvent at room temperature with short reaction time. The catalyst exhibits excellent catalytic activity, selectivity, and recyclability. The nanocatalyst structure was characterized by FT-IR, SEM, XRD, TGA, VSM, and EDS. There are significant advantages of […]
As a natural-based catalyst, nano-Fe3O4@dextrin/Si(CH2)3/DABCO was fabricated and characterized with different analytical methods such as field emission scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray mapping, energy-dispersive X-ray spectroscopy, thermogravimetric analysis, and vibrating sample magnetometer. The mentioned new natural magnetic nanocatalyst was employed for the three-component synthesis of tetrahydrobenzo[b]pyrans and spirooxindoles from aromatic aldehyde […]
As a natural-based catalyst, nano-Fe3O4@dextrin/Si(CH2)3/DABCO was fabricated and characterized with different analytical methods such as field emission scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray mapping, energy-dispersive X-ray spectroscopy, thermogravimetric analysis, and vibrating sample magnetometer. The mentioned new natural magnetic nanocatalyst was employed for the three-component synthesis of tetrahydrobenzo[b]pyrans and spirooxindoles from aromatic aldehyde […]
p-Dodecylbenzenesulfonic acid (DBSA) was used as a catalyst for a simple and efficient one-pot synthesis of aryl substititued tetrahydrobenzo[b]pyrans and dihydropyrano[c]chromens via initial Knoevenagel, subsequent Micheal and final heterocyclization reactions of aryl aldehyde, malononitrile and 4-hydroxycoumarin/dimedone in moderate to excellent yields. The present method was operationally simple and use of water as the reaction medium […]
The utilization of hydroxy sodalite (H-SOD) as catalyst under solvent-free condition is described for the efficient preparation of tetrahydrobenzo[b]pyrans. These compounds are synthesized by three-component reactions of aldehydes, alkylnitriles and dimedone. H-SOD that is the waste-product of zeolite manufacturing process is used as an efficient and a very inexpensive catalyst. Furthermore, it can be reused […]
