Magnetically recyclable silica-coated ferrite magnetite-K₁₀ montmorillonite nanocatalyst and its applications in O, N, and S-acylation reaction under solvent-free conditions

Abstract

Novel silica-coated ferrite nanoparticles supported with montmorillonite (K10) have been prepared and explored for their catalytic activity for the O, N, and S-acylation reactions under solvent-free conditions.

Magnetically Recoverable Silica-Decorated Ferromagnetic-Nanoceria Nanocatalysts and Their Use withO- andN-Butyloxycarbonylation Reaction via Solvent-Free Condition

“…The O–Fe vibrational peaks were given at 694.76 cm –1 as well as 450.76 cm –1 . Their peak values appeared similar to those reported by Tandon et al 30 In the FT-IR spectroscopy of Fe 3 O 4 @SiO 2 ( Figure 1 B), a peak at 3211.81 cm –1 matched the O–H bond vibrations of the hydroxyl group stretched in SiO 2 . 30 Furthermore, the signal at 1631.61 and 1012.31 cm –1 on the surface of SiO 2 was ascribed to the H–O–H class.…”

“…Their peak values appeared similar to those reported by Tandon et al 30 In the FT-IR spectroscopy of Fe 3 O 4 @SiO 2 ( Figure 1 B), a peak at 3211.81 cm –1 matched the O–H bond vibrations of the hydroxyl group stretched in SiO 2 . 30 Furthermore, the signal at 1631.61 and 1012.31 cm –1 on the surface of SiO 2 was ascribed to the H–O–H class. The Fe–O–Si bond was assigned to that same distinctive signal at 690.81 cm –1 , confirming the covering of Fe 3 O 4 with SiO 2 .…”

Synthesis and characterization of Fe3O4@SiO2@K10 NPs applicable for N-ter-butyloxycarbonylation using solvent-free conditions

“…Finally, the nanoparticles were collected from the reaction mixture by decantation method, then nanocatalysts were washed with aqueous alcohol, and dry at 70 0 C under vacuum for about 12 hours. 51 1 gm of Fe3O4@SiO2 nanoparticles were dispersed in 60 mL of ethanol with constant stirring about 1h. After that, 0.3 gm of MMT (K10) to the solution with vigorous stirring.…”

Iodine-Promoted N-Acylation of Amines with Hydrazide: An Efficient Metal-Free Amidation

“…N-(p-Tolyl)acetamide (3ag). 35 Compound 3ag was purified by column chromatography (6:1 PE/EtOAc), obtained as a white solid (51.4 mg, 69%), m.p. 147-148 °C.…”