M. Norouzi, D. Elhamifar, Reza Mirbagheri
Aug 1, 2018
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Influential Citations
19
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Journal
Journal of the Taiwan Institute of Chemical Engineers
Abstract
Abstract A novel ethyl and boron sulfonic acid based bifunctional periodic mesoporous organosilica [BPMO-Et-B(OSO3H)2] with dual Lewis-protic acidic sites was prepared, characterized and applied as efficient nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans. The BPMO-Et-B(OSO3H)2 was prepared by the chemical attachment of boric acid [B(OH)3] on an ethyl-based periodic mesoporous organosilica (PMO-Et) followed by treatment with chlorosulfonic acid (ClSO3H) at room temperature. This nanocatalyst was characterized using Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), low-angle powder X-ray diffraction (LAPXRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis and transmission electron microscopy (TEM). The BPMO-Et-B(OSO3H)2 was shown to be a highly efficient nanocatalyst for three-component synthesis of tetrahydrobenzo[b]pyran derivatives at room temperature under solvent-free conditions. Moreover, the BPMO-Et-B(OSO3H)2 was recovered and reused at least 8 times without significant decrease in its activity.