Nano-eggshell/B(III)as a highly efficient heterogeneous catalyst for the synthesis of 1,3-oxazines in aqueous media, along with DFT simulations
In the present study, a convenient and greener synthesis of a series of naphtho[1,2-e][1,3]oxazines was accomplished via three-component one-pot cyclocondensation between β-naphthol, formaldehyde, and various amines using nano-eggshell/B(III) as a natural catalyst in aqueous medium. The Lewis acid nano-eggshell/B(III) catalyst was investigated by techniques such as Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetry analysis (TGA), energy-dispersive X-ray spectroscopy (EDS), mapping, field emission scanning electron microscopy (FESEM) and transmission…
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