Preparation and characterization of a novel Wells–Dawson heteropolyacid-based magnetic inorganic–organic nanohybrid catalyst H6P2W18O62/pyridino-Fe3O4for the efficient synthesis of 1-amidoalkyl-2-naphthols under solvent-free conditions
Preparation and characterization of a novel Wells–Dawson heteropolyacid-based magnetic inorganic–organic nanohybrid catalyst H<sub>6</sub>P<sub>2</sub>W<sub>18</sub>O<sub>62</sub>/pyridino-Fe<sub>3</sub>O<sub>4</sub>for the efficient synthesis of 1-amidoalkyl-2-naphthols under solvent-free conditions
作者:Reza Tayebee、Mostafa M. Amini、Hooriyeh Rostamian、Azam Aliakbari
DOI:10.1039/c3dt51594j
日期:——
A novel magnetic inorganicâorganic nanohybrid material H6P2W18O62/pyridino-Fe3O4 (HPA/TPI-Fe3O4) was fabricated and performed as an efficient, eco-friendly, and highly recyclable catalyst for the solvent-free, one-pot, and multi-component synthesis of various substituted 1-amidoalkyl-2-naphthols from the reaction of β-naphthol, an aldehyde, and benzamide with good to excellent yields (47â94%) and in a short span of time (25â60 min). The nanohybrid catalyst was prepared by the chemical anchoring of WellsâDawson heteropolyacid H6P2W18O62 onto the surface of modified Fe3O4 nanoparticles with N-[3-(triethoxysilyl)propyl]isonicotinamide (TPI) linker. The magnetically recoverable catalyst was easily recycled at least eight times without any loss of catalytic activity. XRD, TEM, UV-vis, and FTIR confirmed that the heteropolyacid H6P2W18O62 is well dispersed on the surface of the solid support and its structure is retained after immobilization on the pyridine modified Fe3O4 nanoparticles. This protocol is developed as a safe and convenient alternate method for the synthesis of 1-amidoalkyl-2-naphthols utilizing an eco-friendly, and a highly reusable catalyst.
A novel inorganic–organic nanohybrid material H<sub>4</sub>SiW<sub>12</sub>O<sub>40</sub>/pyridino-MCM-41 as efficient catalyst for the preparation of 1-amidoalkyl-2-naphthols under solvent-free conditions
作者:R. Tayebee、M. M. Amini、M. Akbari、A. Aliakbari
DOI:10.1039/c5dt00368g
日期:——
A new inorganic–organic nanohybrid material was prepared and performed as an efficient catalyst for the one-pot multi-component synthesis of different substituted 1-amidoalkyl-2-naphthols under solvent-free conditions.