Novel magnetic nanoparticles Fe3O4-immobilized domino Knoevenagel condensation, Michael addition, and cyclization catalyst

Magnetic nanoparticle-supported imidazole tribromide: a green, mild, recyclable and metal-free catalyst for the oxidation of sulfides to sulfoxides in the presence of aqueous hydrogen peroxide

“…XRD of the bare magnetic nanoparticles displayed patterns consistent with the patterns of inverse cubic spinel ferrites described in the literature (Fig. 47,48 SEM analysis of the nano-g-Fe 2 O 3 -IM tribromide. 42,43 The position and relative intensities of all peaks in the XRD pattern of nano-g-Fe 2 O 3 -IM tribromide conrm well with standard XRD pattern of nano-g-Fe 2 O 3 , indicating retention of the crystalline inverse cubic spinel ferrites structure during the functionalization process.…”

Formamidinesulfinic Acid‐Functionalized Fe3O4@SiO2 as a Green and Magnetic Recyclable Catalyst for Synthesis of Pyrano[2, 3‐d] pyrimidinone Derivatives

“…FSA is an organosulfur compound with white or pale‐yellow color, odorless crystalline powder which is stable both in solid form and in cold aqueous solution and insoluble in typical organic solvents and hence can easily be reused at the end of the reaction. Recently, formamidinesulfinic acid has been used in chemical and industrial processes, as multi‐purpose reagent, catalyst or reductant …”

“…The Knoevenagel reaction is the one‐pot condensation of active methylenes with carbonyl compounds followed by a dehydration reaction . The product of this condensation is known as β, β‐difunctionalized styrene, which has found a great relevance in biologically active compounds, pharmaceutical, cosmetic and agrochemicals industries ,…”

An Efficient and More Sustainable One-Step Continuous-Flow Multicomponent Synthesis Approach to Chromene Derivatives

“…Using this direct approach, several homogeneous and heterogeneous catalysts, such as L-proline [7], thiourea dioxide [8], magnesium oxide [9], 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU) [10], glycerol [11], and ionic liquids [12] have been explored for the synthesis of these molecules under batch reaction conditions. Recently, guanidine supported on magnetic nanoparticles [13], hydroxyapatites [14], and Amberlyst A21 [15] have also been employed for the synthesis of these molecules in labscale batch setup.…”