Preparation and characterization of magnetically separable MgFe₂O₄/Mg(OH)₂ nanocomposite as an efficient heterogeneous catalyst for regioselective one‐pot synthesis of β‐chloroacetates from epoxides

Abstract

Magnetically separable MgFe 2 O 4 /Mg(OH) 2 nanoparticles were fabricated and characterized using various techniques. These nanoparticles were used as a new catalyst for regioselective one-pot synthesis of β-chloroacetates from epoxides in the presence of NiCl 2 ⋅6H 2 O and acetic anhydride. All reactions were carried out in ethanol at room temperature within 22-80 min giving the β-chloroacetates in high to excellent yields. The nanocatalyst was easily separated using an external magnet and reused several times without any significant loss of efficiency or magnetic property.

CoFe2O4/Cu(OH)2 magnetic nanocomposite: an efficient and reusable heterogeneous catalyst for one-pot synthesis of β-hydroxy-1,4-disubstituted-1,2,3-triazoles from epoxides

“…CoFe 2 O 4 nanoparticles were prepared by a solid-state procedure according to our previous research. 58 Briey, in a mortar, CoCl 2 , Fe(NO 3 ) 3 $9H 2 O, NaOH, and NaCl were mixed with the desired molar ratio (1 : 2 : 8 : 2) and ground together for 55 min. The reaction started quickly along with the release of heat.…”

Synthesis and characterization of poly(styrene-block-acrylic acid)/Fe3O4 magnetic nanocomposite using reversible addition−fragmentation chain transfer polymerization

“…Also, the stretching vibration of C=O is seen at 1680 cm 1 and the absorption bands in 1441 and 1595 cm 1 are attributed to aromatic C=C bond of the RAFT agent. Figure S1 (see Supplementary Information) shows the 1 Figure 2 shows the FTIR spectra of PSt-CTA (a) and PSt-b-PAA (b). The most important absorption bands in the FTIR spectrum of the PSt-CTA can be named as the stretching vibration of the aromatic and aliphatic C{H at 3100-2800 cm 1 region, the stretching vibrations of C=C at 1598 and 1492 cm 1 , and (C{ H) in the aromatic ring at 756 and 698 cm 1 .…”

“…Magnetic nanocomposites are a class of functional materials that have potential use in a broad variety of applications such as cell separation, enzyme immunoassay, and drug delivery due to their unique physicochemical properties including super-paramagnetism, high saturation magnetization, and high magnetic susceptibility [1][2][3][4]. Polymer/Fe 3 O 4 magnetic nanocomposites are a kind of polymeric magnetic nanocomposites with magnetism obtained via a certain method for combining organic polymer and inorganic magnetic nanoparticles [5][6][7][8][9].…”

Green approach for the regioselective synthesis of β-thiol-1,4-disubstituted-1,2,3-triazoles using Fe3O4@SiO2-PMA-Cu as a novel and efficient magnetically recoverable nanocatalyst

“…Considering all these aspects, and in continuation of our previous works [54][55][56][57][58][59][60] , herein we wish to introduce Fe 3 O 4 @SiO 2 -PMA-Cu nanocomposite as an e cient and novel catalyst, where PMA clusters are found to be anchored on Fe 3 O 4 @SiO 2 surface and copper nanoparticles are supported on the PMA surface. The new synthesized nanocomposite was utilized in three-component synthesis of β-thiol-1,4disubstituted-1,2,3 triazoles from sodium azide, thiiranes, and terminal alkynes as a green and recyclable magnetic catalyst (Fig.…”