Ionic liquid attached to colloidal silica nanoparticles: as high performance catalyst for the preparation of dihydrofurans under microwave irradiation

Abstract

The preparation of trans-dihydrofurans has been achieved by a one-pot condensation reaction of 4-bromophenacyl bromide, aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione using bis (1(3-trimethoxysilylpropyl)-3-methyl-imidazolium) copper tetrachloride tethered to colloidal silica nanoparticles under microwave irradiation. Ionic liquid tethered to colloidal silica nanoparticles have been characterized by H NMR spectroscopy, scanning electron microscope, energy dispersive spectroscopy, thermogravimetric analysis and dynamic light scattering.

Copper iodide nanoparticles‐decorated porous polysulfonamide gel: As effective catalyst for decarboxylative synthesis of N‐Arylsulfonamides

“…Figure 4 illustrates 2 is attributed to CuI species of the catalyst. [33] The XRD patterns clearly confirm the coating of CuI NPs in PEA-PSA due to the diffraction peaks of CuI NPs. Also, the XRD pattern of PEA-PSA@CuI given in Figure 4 shows that SiO 2 NPs have been removed through the silica etching process.…”

Nanoparticle‐Catalysed 1,3‐Dipolar Cycloadditions

“…As far as supported nano-iron oxides catalysts are concerned, an example of silica-coated nanomagnetite (Fe 3 O 4 @SiO 2 ) was exploited in the [3+2] cycloaddition between fullerene and N-phenyl-C-4-nitrophenylnitrone affording the corresponding functionalised fullerene derivative 7 (Scheme 6). [61] Scheme 6. Cycloaddition between fullerene and N-phenyl-C-4-nitrophenyl nitrone catalysed by Fe 3 O 4 @SiO 2 NPs.…”

Supramolecular Fe3O4@PEG/−diaza crown ether@Ni: a novel magnetically reusable nano catalyst for the clean synthesis of 2‐aryl‐2,3‐dihydroquinazolin‐4(1H)‐ones

“…In a typical procedure, in a two-neck flask, Fe 3 O 4 nanoparticles were synthesized by FeCl 3 .6H 2 O and FeCl 2 .4H 2 O according to the reported method. [45] Under ultrasonic irradiation, Fe 3 O 4 @PEG magnetic nanoparticles were prepared. In a 250 ml, three-necked flask Fe 3 O 4 nanoparticles (1.0 g), deionized water (50 ml) and a solution of 25 ml sodium dodecyl sulfate (20 mol%) 12 l 50 93 241-243 [38] The products were specified by comparing their spectral and physical data with the valid samples.…”